Lindy Switch 32 341 User Manual

LINDY CPU Switch USB  
Installation and Use  
Part  
Model  
32 341  
LINDY CPU Switch USB PC  
Part  
Model  
32 342  
LINDY CPU Switch USB Mac  
LINDY CPU Switch USB Installation and Use  
First edition (January 2000)© 2000 LINDY Electronics Ltd.  
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Warranty  
LINDY Electronics Ltd warrants that this product shall be free from defects in  
workmanship and materials for a period of one year from the date of original  
purchase. If the product should fail to operate correctly in normal use during the  
warranty period, LINDY will replace or repair it free of charge. No liability can be  
accepted for damage due to misuse or circumstances outside LINDYs control. Also  
LINDY will not be responsible for any loss, damage or injury arising directly or  
indirectly from the use of this product. LINDYs total liability under the terms of this  
warranty shall in all circumstances be limited to the replacement value of this  
product.  
If any difficulty is experienced in the installation or use of this product that you are  
unable to resolve, please contact your supplier.  
Trademarks  
All trademarks mentioned in this manual are acknowledged to be the property of the  
respective trademark owners.  
Compaq is a registered trademark of Compaq Computer Corporation.  
Hewlett-Packard is a registered trademark of Hewlett-Packard.  
IBM, PC/AT, PS/2, RS/6000 and ThinkPad are registered trademarks of  
International Business Machines Corporation.  
Logitech, MouseMan+ and Pilot Mouse+ are trademarks of Logitech Inc.  
Microsoft and Windows are registered trademarks, and IntelliMouse is a trademark  
of Microsoft Corporation.  
Velcro is a trademark of Velcro USA Inc.  
LINDY CPU Switch USB  
Installation and Use  
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Radio Frequency Energy  
Shielded cables must be used with this equipment to maintain compliance with radio  
frequency energy emission regulations and ensure a suitably high level of immunity  
to electromagnetic disturbances.  
European EMC directive 89/336/EEC  
FCC Compliance Statement (United States)  
This equipment generates, uses and can radiate  
radio frequency energy and if not installed and  
used properly, that is, in strict accordance with  
the manufacturers instructions, may cause  
interference to radio communication. It has been  
tested and found to comply with the limits for a  
class A computing device in accordance with  
the specifications in Subpart J of part 15 of FCC  
rules, which are designed to provide reasonable  
protection against such interference when the  
equipment is operated in a commercial  
environment. Operation of this equipment in a  
residential area may cause interference, in  
which case the user at his own expense will be  
required to take whatever measures may be  
necessary to correct the interference. Changes  
or modifications not expressly approved by the  
manufacturer could void the users authority to  
operate the equipment.  
This equipment has been tested and found to  
comply with the limits for a class B computing  
device in accordance with the specifications in  
the European standard EN55022. These limits  
are designed to provide reasonable protection  
against harmful interference. This equipment  
generates, uses and can radiate radio frequency  
energy and if not installed and used in  
accordance with the instructions may cause  
harmful interference to radio or television  
reception. However, there is no guarantee that  
harmful interference will not occur in a particular  
installation. If this equipment does cause  
interference to radio or television reception,  
which can be determined by turning the  
equipment on and off, the user is encouraged to  
correct the interference with one or more of the  
following measures: (a) Reorient or relocate the  
receiving antenna. (b) Increase the separation  
between the equipment and the receiver. (c)  
Connect the equipment to an outlet on a circuit  
different from that to which the receiver is  
connected. (d) Consult the supplier or an  
experienced radio / TV technician for help.  
Canadian Department of Communications  
RFI statement  
This equipment does not exceed the class A  
limits for radio noise emissions from digital  
apparatus set out in the radio interference  
regulations of the Canadian Department of  
Communications.  
Le présent appareil numérique n’émet pas de  
bruits radioélectriques dépassant les limites  
applicables aux appareils numériques de la  
classe A prescrites dans le règlement sur le  
brouillage radioélectriques publié par le  
ministère des Communications du Canada.  
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Contents  
1. Introduction .................................................................................... 6  
1.1 Key features........................................................................................... 6  
1.2 Package contents (models 32 341 and 32 342) .................................... 7  
1.3 Remote controller contents (part code: 32 255) .................................... 7  
1.4 Product information ............................................................................... 8  
2. Installation ...................................................................................... 10  
2.1 What you will need ............................................................................... 10  
2.2 Mounting the LINDY CPU Switch USB ................................................. 11  
2.3 Connecting your devices ...................................................................... 11  
2.4 Configuring the LINDY CPU Switch USB............................................... 14  
2.4.1 Setting the USB enumeration guard time ..................................... 15  
2.4.2 Setting the autoscan dwell time .................................................... 15  
2.4.3 Setting the LINDY CPU Switch USB to scan all ports or just the  
active ports ................................................................................... 16  
2.4.4 Setting the keyboard hotkey combination ..................................... 16  
2.4.5 Enabling and disabling mouse channel switching ........................ 16  
2.5 Powering on the LINDY CPU Switch USB ............................................ 17  
2.6 Configuring your computers .................................................................. 17  
2.7 Re-enabling a disconnected PS/2 mouse ............................................. 17  
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3. Using the LINDY CPU Switch USB ............................................... 18  
3.1 Power on status ..................................................................................... 18  
3.2 Front panel key ..................................................................................... 18  
3.3 Switching between computers using the LINDY CPU Switch USB ....... 19  
3.4 Status display ........................................................................................ 19  
3.5 Keyboard hotkey control........................................................................ 20  
3.6 Mouse control ........................................................................................ 22  
3.7 Autoscan mode ..................................................................................... 22  
3.8 The optional remote controller .............................................................. 22  
3.9 Querying the LINDY CPU Switch USBs firmware version .................... 23  
3.10 PC and Macintosh keyboard equivalent key mappings ....................... 23  
Appendices  
A - Cable specifications..................................................................................... 24  
A1 USB cables............................................................................................. 24  
A2 Video cables .......................................................................................... 24  
A3 PS/2 style keyboard and mouse extension cables ................................ 25  
A4 Remote controller extension cables ....................................................... 25  
B – Problem Solving........................................................................................... 26  
LINDY CPU Switch USB  
Installation and Use  
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1. Introduction  
Thank you for purchasing the LINDY CPU Switch USB. Your LINDY CPU Switch  
USB is a high performance keyboard, monitor, mouse and peripheral sharing device  
which supports a wide range of hardware and software platforms and connects to  
your computers via their USB ports.  
1.1 Key features  
PC and MAC models  
Enables a keyboard, monitor, mouse and range of USB peripherals to be  
switched between four USB-enabled computers.  
Uses new innovative technology that is Patent Pending in the U.K.  
Numeric status display and front panel pushbutton make computer selection  
easy.  
Supports high quality video resolutions up to 1600 x 1280 pixels and screen  
refresh rates up to 100 Hz.  
Each computer may be connected using just one standard USB cable and one  
standard video cable.  
Robust metal chassis sits securely on your desktop.  
Internal USB hub function enables 3 USB peripherals to be connected. More USB  
peripherals may be added by using additional USB hubs.  
LINDY CPU Switch USB has its own power supply and consequently will power  
USB hubs attached to its peripheral ports. This enables keyboards with integral  
hubs and other non-powered USB hubs to be supported.  
Available in attractive translucent blue to match with your computer equipment.  
Remote controller option enables the LINDY CPU Switch USB to be controlled  
from a small neat remote control unit that may be attached to the top of a  
keyboard or the side of a monitor.  
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Supports monitor display data channel signalling (DDC1 & DDC2) enabling your  
computer to communicate with the monitor.  
Supports autoscan for easy monitoring of computer activity.  
Enables switching between all computer ports or just active computer ports for  
maximum convenience.  
PC models  
PS/2-style keyboard and mouse ports enable a traditional style PC keyboard and  
mouse to be connected to the LINDY CPU Switch USB.  
LINDY CPU Switch USBs channel can be changed using keyboard hotkeys or a  
3-button mouse.  
Traditional style PS/2 keyboard and mouse signals automatically converted to  
USB format within the LINDY CPU Switch USB.  
Keyboard and mouse activity indication.  
Video blanking feature.  
1.2 Package contents (models 32 341 and 32 342)  
LINDY CPU Switch USB.  
Power adapter.  
This installation guide.  
1.3 Remote controller contents (part code: 32 255)  
Remote control module.  
Velcro strip for mounting remote controller.  
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1.4 Product information  
Fig. 1 – LINDY CPU Switch USB model 32 341  
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Fig. 2 - Remote control pad / display (optional accessory) (Part: 32 255)  
Fig. 3 LINDY CPU Switch USB model 32 342  
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2. Installation  
2.1 What you will need  
A suitable USB-enabled operating system running on each of your computers.  
Suitable operating systems are Windows 98 release 2 or later and Mac OS 8.6  
or later. Earlier operating system versions are not recommended and may cause  
occasional problems. Other operating systems such as Windows ® 2000, HP-  
UX®, Linux®, SCO® UNIX®, and Novell® NetWare® have USB support or are likely  
to add it soon. DOS, Windows 3.x, Windows 95 and Windows NT either do not  
support USB or are not recommended for use with the LINDY CPU Switch USB.  
Cables to connect the LINDY CPU Switch USB to a USB and video port on each  
of your computers. Cable specifications are given in appendix A.  
A monitor with a standard VGA/SVGA (15 pin) connector that will work when  
connected directly to each of your computers. LINDY CPU Switch USB supports  
low and high resolution monitors.  
Suitable USB drivers for all the USB peripherals that you wish to connect to the  
LINDY CPU Switch USB. Common drivers, such as those for keyboards and  
mice, are usually included with the operating system. If you are connecting to  
both PC and Apple Macintosh computers then you should ensure that you have  
drivers for both platforms.  
If you wish to connect more than three USB peripherals to the LINDY CPU  
Switch USB then you will need additional USB hubs. These may be bus powered  
or powered with their own independent power supplies. All USB hubs should be  
at least USB 1.0 compliant and should preferably be USB 1.1 compliant.  
A suitable keyboard and mouse. If you have LINDY CPU Switch USB Mac model  
32 342 then these must be USB devices. If you have the LINDY CPU Switch  
USB PC model 32 341 then these may be USB style devices or traditional PS/2  
style devices. If you are connecting to both PC and Macintosh machines then it  
is recommended that you use a PC keyboard and mouse because the PC  
keyboard and mouse has more keys and buttons than the Macintosh keyboard  
and mouse. If you wish you may connect both types of keyboard or mouse for  
convenience.  
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You may connect standard 2 or 3 button PS/2 or IntelliMouse compatible mice to  
the PS/2 mouse port on the LINDY CPU Switch USB PC model 32 341. The  
LINDY CPU Switch USB supports Internet Micethat are compatible with the  
Microsoft IntelliMouse. These are fitted with a wheel or other scroll control and  
sometimes have additional buttons.  
Examples are:  
All LINDY Mice  
Microsoft IntelliMouse  
Logitech Pilot Mouse +  
Logitech MouseMan+  
Genius NetMouse  
Genius NetMouse Pro  
If you are using an AT keyboard with a 5 pin connector you may connect this to  
the LINDY CPU Switch USB using a standard AT to PS/2 keyboard adapter. If  
you do not wish to use a keyboard and mouse then the LINDY Switch USB will  
operate without these devices connected. If you wish to use the PS/2 style mouse  
to switch the LINDY CPU Switch USB's channel then you will need a three button  
mouse or a LINDY mouse.  
2.2 Mounting the LINDY CPU Switch USB  
The LINDY CPU Switch USB has been designed for use on a desktop or shelf in  
close proximity to the users monitor and peripherals. The optional remote controller  
may be used if you wish to locate the LINDY CPU Switch USB on a desk or shelf  
that is some distance from the monitor and peripherals.  
2.3 Connecting your devices  
Ensure that the power adapter is disconnected from the LINDY CPU Switch USB  
and that all the devices which are to be attached are switched off. Connect your  
keyboard, mouse and monitor to the connectors at the rear of the LINDY CPU  
Switch USB (see figs 1, 2 and 3). Your user and peripheral devices should plug  
directly into the LINDY CPU Switch USB.  
Next connect each computer system unit in turn with a USB and a video cable. The  
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USB cable has different connectors on each end. This ensures that it connects to  
the correct ports. The type A connector (rectangular) plugs into the computer and  
the type B connector (square) plugs into the LINDY CPU Switch USB. USB cables  
should be no longer than 5 metres but this distance may be extended with the use of  
USB hubs. You should use tri-coax video cables to achieve a good video picture  
(the type of thick cable that you see on computer monitor connections). Lower  
quality datacables will function correctly but will generally give relatively poor  
video pictures and are only suitable for screen resolutions of 640 x 480. Any unused  
computer connections can be left unconnected.  
If you are using an Apple Macintosh computer and you wish to use the on/off key  
function on the keyboard then you must connect the keyboard directly to the LINDY  
CPU Switch USBs peripheral port A. If you are using this on/off key function then  
you will also not be able to use an additional USB hub to extend the cable run  
between the computer and the LINDY CPU Switch USB. This is because the  
Macintosh on/off key function is not supported through a USB hub.  
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Figure 4 - a typical LINDY CPU Switch USB installation whereby a range of  
peripherals are shared between four computers  
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2.4 Configuring the LINDY CPU Switch USB  
The LINDY CPU Switch USB is supplied pre-configured with factory defaults which  
are suitable for most applications. A row of option switches on the underside of the  
LINDY CPU Switch USB may be used to select various other configuration options  
as follows:  
Swtches 1 to 4 are only  
applicable to the  
LINDY CPU Switch USB 32 341  
ON  
1
2 3 4 5 6 7  
8
= ON  
OFF  
= OFF  
Hotkeys  
disabled  
Hotkeys =  
ALT + SHIFT  
Scan all ports  
Hotkeys =  
CTRL + SHIFT  
Scan active ports only  
(default)  
Hotkeys =  
CTRL + ALT  
(default)  
Autoscan dwell time  
= 5 seconds  
Disable mouse  
switching of channels  
Autoscan dwell time  
= 2 seconds (default)  
Enable mouse switching  
of channels (default)  
Enumeration guard time’  
= 16 seconds  
Reserved - set OFF  
Enumeration guard time’  
= 8 seconds  
Enumeration guard time’  
= 4 seconds  
Enumeration guard time’  
= 2 seconds (default)  
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2.4.1 Setting the USB enumeration guard time  
(option switches 5 and 6)  
A USB-enabled computer detects and configures USB peripherals when they are  
connected to or disconnected from its USB ports. This process is called  
enumeration. You can often see when the enumeration process is in progress as the  
computer will usually display a timer or hourglass for a few seconds after the  
connection of a USB peripheral whilst the device is being enumerated.  
This enumeration process will take place each time that the LINDY CPU Switch USB  
locks on to a new computer port. Unfortunately computer software is not generally  
robust enough to cope with the connection between the computer and peripherals  
being broken during this enumeration process. If the connection is lost part of the  
way through the enumeration process then the computer software or the peripherals  
can hang.  
To overcome this problem the LINDY CPU Switch USB is fitted with an enumeration  
guard timeout system. Once the LINDY CPU Switch USB has locked on to a channel  
it will remain connected to that channel for at least the enumeration guard time. This  
ensures that the enumeration process is complete before further channel changes  
are allowed and consequently ensures robust and reliable operation.  
The enumeration process takes longer if more peripherals are connected. Select an  
enumeration time that is longer than the longest observed enumeration time. The  
enumeration time can be judged by the length of time that the hourglass or timer  
remains on the computer screen after a channel change (normally a few seconds).  
Alternatively you may select the shortest enumeration guard time (2 seconds) and  
remember not to change the channel whilst the hourglass or timer is displayed.  
2.4.2 Setting the autoscan dwell time  
The LINDY CPU Switch USB may be made to autoscan the connected computers.  
During autoscan the LINDY CPU Switch USB displays the video signal from each  
computer in turn for a selected time period. This time period is known as the dwell  
time and may be selected to be 2 or 5 seconds using option switch 7. Ports are  
scanned in ascending numerical sequence and all the ports or just the active ports  
will be scanned according to the setting of option switch 8.  
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2.4.3 Setting the LINDY CPU Switch USB to scan all ports or just the  
active ports  
The LINDY CPU Switch USBs front panel button may be used to select the required  
computer. To avoid the need to press the key more times than necessary the LINDY  
CPU Switch USB may be set to scan just the ports that have powered computers  
attached. When the LINDY CPU Switch USB has been set to scan these active’  
ports, only these ports may be selected using the front panel button. If you wish to  
be able to select all the ports, regardless of whether the connected computers are  
powered on or not, then the LINDY CPU Switch USB may be set to scan all ports.  
The scan strategy is selected using option switch 8. This setting also controls the  
ports that are scanned during autoscan and the ports that may be selected using the  
keyboard hotkeys+TAB or a 3-button mouse (model 32 341 only).  
The LINDY CPU Switch USB determines if a port is active by monitoring the  
signals present on the USB interface cable. The LINDY CPU Switch USB is not  
able to detect an active computer if a USB cable from that computer is not  
connected to the LINDY CPU Switch USB.  
2.4.4 Setting the keyboard hotkey combination  
(model 32 341 only)  
The LINDY CPU Switch USBs channel may be selected by pressing keyboard  
hotkey combinations on the keyboard attached to the PS/2 keyboard port. Keyboard  
hotkey combinations consist of three keys that are pressed together to activate the  
required function. For example, pressing CTRL and ALT and 2 together would select  
channel 2 (assuming the default hotkeys). Certain hotkey combinations may  
sometimes be used by other systems or software so various different hotkey  
combinations may be selected. Options switches 1 and 2 are used to select the  
required hotkey combination or disable the hotkeys.  
2.4.5 Enabling and disabling mouse channel switching  
(model 32 341 only)  
A three button PS/2 mouse or an IntelliMouse can be used to switch channels on the  
LINDY CPU Switch USB. To switch to the next channel, the user simply holds down  
the central button or wheel button and presses the left hand button to change  
channel. If the user does not wish to take advantage of this feature, it can be  
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disabled using option switch 3. If the third button is being used to switch the LINDY  
CPU Switch USB then it is not available for use with PC software although the  
function of an IntelliMouse wheel is not affected. If you wish to use the full function  
of a 3 button mouse or IntelliMouse for your PC software then you should disable  
mouse channel switching.  
2.5 Powering on the LINDY CPU Switch USB  
The LINDY CPU Switch USB is powered from the supplied mains power adapter.  
There is no on/off switch on the LINDY CPU Switch USB so it will start to operate as  
soon as the power adapter has been connected to the LINDY CPU Switch USB and  
plugged into the mains supply.  
2.6 Configuring your computers  
We recommend that you configure each computer in turn for operation with your  
USB devices without changing the LINDY CPU Switch USBs channel. Configure  
your computers as if the USB devices were connected directly to the computer.  
Some PC compatible computers may not recognise a USB keyboard or mouse until  
a suitable driver has been loaded. It may only be possible to load these drivers if  
you have keyboard and mouse control and so consequently you may need to  
connect a traditional style PS/2 keyboard and mouse to load the USB drivers. Once  
these USB drivers have been loaded the PS/2 keyboard and mouse may be  
disconnected.  
Remember that you must be using a suitable operating system such as  
Windows 98 or Mac OS 8.6.  
If you are using a version of Apples operating system earlier than 8.6 then you  
must upgrade to a later version. This upgrade is available on Apples website.  
If you use an earlier operating system then your peripherals will hang after  
typically 25 channel changes.  
2.7 Re-enabling a disconnected LINDY PS/2 mouse (32 341 only)  
If you disconnect the LINDY PS/2-style mouse from the LINDY CPU Switch USB by  
accident during operation then the mouse operation will be lost when the mouse is  
plugged back in. To avoid having to reboot the entire system in this situation the  
LINDY CPU Switch USB is fitted with an automatic mouse recovery system.  
With the LINDY PS/2 mouse disconnected, change the channel using the front  
panel key or keyboard hotkeys. The LINDY CPU Switch USB detects that the mouse  
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has been disconnected and triggers the automatic recovery system. Plug in the  
LINDY PS/2 mouse and the LINDY CPU Switch USB will re-initialise it.  
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3. Using the LINDY CPU Switch USB  
This section explains the general operation of the LINDY CPU Switch USB. We  
recommend that you read this section before starting to use the product.  
3.1 Power on status  
At power on the LINDY CPU Switch USB selects computer number 1 and displays  
1on the front panel numerical display.  
3.2 Front panel key  
The front panel key is used to select which channel (1 to 4) is currently connected to  
the user ports (coloured green on the rear panel) and which is currently controlled  
by the shared keyboard, mouse and monitor. Pressing the key during normal  
operation will cause the next computer channel to be selected.  
Depending on the position of option switch 8, pressing the front panel key will either  
select the next active computer channel or the next computer channel in numerical  
sequence (1,2,3,4,1,2,3 etc.).  
Using the front panel key you may cycle through the available computer channels  
until you find the required port. When the LINDY CPU Switch USB detects that no  
new key presses have occurred for a second it will start the channel lock-on  
process. During the lock-on process the display will flash to indicate that the LINDY  
CPU Switch USB is currently waiting for the enumeration guard period (see section  
2.4.1). The channel may not be changed again until this process is complete and  
the display stops flashing.  
The front panel key may be used to select autoscan mode. Autoscan mode is  
activated by holding the key down for more than 5 seconds until the display starts to  
show a rotating segment. Autoscan mode may be cancelled by pressing the front  
panel key whilst within autoscan mode.  
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3.3 Switching between computers using the LINDY CPU Switch USB  
When you select a new computer using the LINDY CPU Switch USB, the  
peripherals that were connected to the old computer will be disconnected and  
allocated to the new computer regardless of whether they are currently servicing  
jobs on the old computer. For example, if you are printing from the old computer and  
you switch to a new computer before the print job is complete then only part of your  
print job will actually be printed.  
In particular you should avoid switching computers whilst a computer is  
reading or writing data to a USB data storage device such as a ZIP drive.  
Where practical it is advisable to eject removable disks on USB drives before  
switching computers.  
3.4 Status display  
The status display usually shows the currently selected port. If autoscan mode is  
selected, the segments will illuminate in sequence in a clockwise direction  
interspersed with a display of the currently selected channel. If the LINDY CPU  
Switch USB is waiting for the enumeration guard process to complete then the  
display will flash. Data flow from the mouse or keyboard attached to the PS/2 style  
keyboard and mouse ports (model 32 341 only) causes the dot in the lower right  
hand corner of the display to flash.  
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3.5 Keyboard hotkey control (model 32 341 only)  
The LINDY CPU Switch USB may be conveniently controlled by pressing keyboard  
hotkey combinations on the keyboard attached to the PS/2 style keyboard port (see  
figure 4). All of the hotkey control commands are invoked by holding down the two  
hotkeys and then pressing a command key. By default, the two hotkeys are CTRL’  
and ALT, although other combinations can be selected (see section 2.4.4). Once  
the hotkey command has been activated you will need to release the hotkeys and  
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the command key before a new hotkey command is accepted by the LINDY CPU  
Switch USB. HOTKEYs + TAB is an exception and this allows you to tab through’  
the ports by holding down the hotkeys and repeatedly pressing TAB.  
The hotkey command are summarised below (note that the numbers on the numeric  
keypad do not form part of a valid hotkey) :  
HOTKEYsand 1- selects channel 1  
HOTKEYsand 2- selects channel 2  
HOTKEYsand 3- selects channel 3  
HOTKEYsand 4- selects channel 4  
HOTKEYsand TAB- selects the next channel. The next channel may be the next  
active channel or the next channel in numerical sequence depending upon the  
position of option switch 8 (see section 2.4.3).  
HOTKEYsand A- selects autoscan mode where each channels video is  
displayed for the selected time (see section 2.4.2). To cancel autoscan mode simply  
select any fixed channel either by hotkey or by using the front panel button.  
HOTKEYsand 0switches off the video signal and displays 0. This will cause  
some monitors to go into standby mode or switch off. The video signal can be re-  
enabled by selecting a channel.  
Examples of common hotkey sequences (assuming CTRL + ALT hotkey option):  
To select channel 2:  
Press ED  
ED  
release  
To 'tab through' channels:  
Press ED Yrelease Ypress Yꢁ  
release Ypress Y release YED  
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3.6 Mouse control (model 32 341 only)  
The LINDY CPU Switch USBs channels may be changed using a three button  
mouse or IntelliMouse. In order to switch to the next channel simply hold down the  
central mouse button or wheel button and click on the left hand mouse button. The  
channel will then change to the next channel. The next channel may be the next  
active channel or the next channel in numerical sequence depending on the setting  
of option switch 8 (see section 2.4.3).  
3.7 Autoscan mode  
Autoscan mode may be selected by holding the front panel key down for 5 seconds  
or by using the keyboard hotkeys. When autoscan mode has been activated the  
front panel display will alternately show a rotating segment and the currently  
selected channel. The video from each computer will be displayed for the time  
period selected by option switch 7 (either 2 seconds or 5 seconds). During autoscan  
all the USB peripherals remain disconnected and only the video signals are  
switched through. Depending upon the position of option switch 8, the LINDY CPU  
Switch USB will lock-on to all the computer ports or just the active computer ports.  
Many modern monitors are fitted with automatic power save relays and will  
switch off after a few seconds if connected to an inactive PC. If you are using  
such a monitor you must not scan inactive ports. Constant switching on and  
off of your monitors relay will eventually damage your monitor.  
3.8 The optional remote controller  
An optional remote controller is available which replicates the front panel key and  
display, but can be located remotely from the LINDY CPU Switch USB. The remote  
controller plugs into the options port on the back of the LINDY CPU Switch USB  
(see figures 1 and 2). This remote controller is particularly useful in applications  
where the LINDY CPU Switch USB is located away from the users desktop. The  
remote controller can be conveniently attached to your keyboard with a couple of  
Velcro strips to give instant channel information and key control. The key and  
display on the remote controller perform exactly the same function as the key and  
display on the front panel of the LINDY CPU Switch USB. The remote controller is  
supplied with a 3 metre cable but this may be extended if necessary to 20 metres.  
LINDY CPU Switch USB  
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3.9 Querying the LINDY CPU Switch USBs firmware version  
For technical support reasons it may sometimes be desirable to know the firmware  
version of your LINDY CPU Switch USB. If the front panel key is held down whilst  
the LINDY CPU Switch USB is powered on then the firmware version will be  
displayed as a sequence of numbers and characters. The three digits of the  
firmware version are shown in sequence on the 7-segment display, one at a time,  
alternating with the letter F. When the firmware version has been displayed the  
LINDY CPU Switch USB will display and equals sign and resume normal operation.  
For example the following sequence would indicate firmware version 1.23.  
)ꢁꢁꢂꢁꢁ)ꢁꢁꢀꢁꢁ)ꢁꢁꢃꢁꢁ  
3.10 PC and Macintosh keyboard equivalent key mappings  
If you are connecting a mixture of IBM compatible PCs and Macintosh computers to  
the LINDY CPU Switch USB then you have several possible keyboard configuration  
options. You may decide to connect both a Macintosh and PC style keyboard to the  
LINDY CPU Switch USB and use the appropriate keyboard for the appropriate  
system. Alternatively you may wish to use the same keyboard to control both  
systems. In this case we recommend that you use a PC 104/105-key keyboard. This  
has more keys than the Macintosh keyboard and so is more suited to universal use.  
The equivalent key mappings on the IBM PC 104/105 key keyboard and the Apple  
keyboard are shown in the following table:  
IBM 104/105-key  
keyboard  
Apple keyboard  
Left Ctrl  
Left Control  
Left Win Start ( )  
Left Alt  
Left Command ( )  
Left Option (alt)  
Right Option (alt)  
Right Command ( )  
Right Control  
Right Alt or Alt Graph  
Right Win Start ( )  
Right Ctrl  
Windows Application ( )  
No equivalent  
No equivalent  
On / off key  
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Appendix A. Cable specifications  
Shielded cables must be used with this equipment to maintain compliance  
with radio frequency energy emission regulations and ensure a suitably high  
level of immunity to electromagnetic disturbances.  
A1. USB cables  
The construction and maximum length of USB cables is specified in the USB  
standard. You should only use cables that conform to this USB standard. These  
cables will be shielded and no longer than 5 metres in length. USB cables have  
different types of connectors at each end to avoid incorrect connection.  
USB peripherals that carry integral cables, such as some keyboards and mice may  
be connected directly to the LINDY CPU Switch USB or may be connected to the  
LINDY CPU Switch USB via a USB hub (see figure 4). USB hubs may be used to  
extend the overall USB cable run beyond the 5 metre limit.  
A2. Video cables  
You will require a video cable for each computer that you wish to connect. The  
LINDY CPU Switch USB uses standard video cables that are terminated at each end  
with a standard 15-way high density D-type male video connector. All the pins on  
the cable are connected straight through.  
We strongly recommend that you use tri-coax 75 ohm video cables that are  
specifically designed to carry video signals. Good quality 10 metre long tri-coax  
video cables show little loss of video quality. Lengths up to 30 metres long will  
usually give an acceptable video picture although the quality falls off as the length  
increases. You should therefore generally use the minimum length possible.  
Tri-coax video cables can easily be identified as they are roughly the same  
thickness as a monitors video cable and are usually lightly fluted on the outside.  
Cheaper and thinner datacables are widely available but are only suitable for low  
video resolutions. Where possible these cheaper cables should be avoided.  
Your monitor will plug directly into the back of the LINDY CPU Switch USB, however  
LINDY CPU Switch USB  
Installation and Use  
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if you wish to extend the distance between the LINDY CPU Switch USB and the  
monitor then you may use a tri-coax video extension cable. This cable should  
preferably be no longer than 10 metres although cable runs up to 20 metres long  
may also give acceptable video quality.  
A3. PS/2 style keyboard and mouse extension cables  
PS/2 style keyboards and mice will plug directly into the LINDY CPU Switch USB  
model 32 341. If required the keyboard and mouse may be located further away  
from the LINDY CPU Switch USB with the aid of extension cables. Extension cables  
should be terminated with 6 pin mini-DIN PS/2 style connectors, with a male  
connector on one end and a female connector on the other end. All pins on the  
extension cable should be wired straight through (1 to 1, 2 to 2, 3 to 3 etc.). Such  
extension cables may be up to 10 metres long. Most keyboards and mice will also  
work with a 20 metre extension cable.  
A4. Remote controller extension cables  
The remote controller is supplied as standard with a 3 metre long lead. This  
distance may be extended with the use of suitable shielded extension cable. This  
extension cable may be up to 20 metres long and should be wired so that all pins  
are connected straight through (1 to 1, 2 to 2, 3 to 3 etc.). Remote controllers with  
longer leads are also available from your supplier.  
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Appendix B. Problem Solving  
Problem:  
Peripherals hang after the LINDY CPU Switch USBs channel is changed.  
Action:  
Ensure that you are using a suitable operating system (see section 2.1). Operating  
systems such as versions of Mac OS earlier than 8.6 are known to have associated  
problems. Ensure that you are not reading from or writing to USB connected disk  
drives whilst you are switching between computers. Ensure that the enumeration  
guard time is longer than the longest observed enumeration delay (see section  
2.4.1) or ensure that you are not switching between computers during the  
enumeration process.  
Problem:  
Video is fuzzy or smudged.  
Action:  
Ensure that you are using high quality tri-coax video cables. These can be easily  
identified as they are roughly the same thickness as a monitors video cable and  
often are lightly fluted on the outside of the cable. Use the minimum possible length  
of video cables.  
Problem:  
The on/off key on a Macintosh keyboard doesnt work.  
Action:  
Ensure that you have plugged the keyboard into port A and that there are not any  
USB hubs connected between the computer and the LINDY CPU Switch USB.  
Problem:  
The enumeration delay time seems too long.  
Action:  
Set the lowest enumeration guard time and remember not to switch away from a  
selected computer until the timer or hourglass indicates the end of the enumeration  
process.  
LINDY CPU Switch USB  
Installation and Use  
Page 29  
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