USER
MANUAL
MODEL 1004
and 1004S
High Speed,
Multipoint Short
Range Modem
Part# 07M1004-C
Doc# 047011UC
Revised 8/10/95
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
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3.0 CONFIGURATION
The Model 1004 is configured using six PC board mounted switch-
es. Figure 1 shows the switch locations, along with the location of the
terminal blocks and optional surge protectors:
3.2 ACCESSING THE CONFIGURATION SWITCHES
The five switches shown in Figure 3 configure the Model 1004 for
RTS/CTS delay, echo, method of carrier control, impedance and
2-wire/4-wire operation. These switches are located internally on the
Model 1004's PC board. To access switch set 1 (SW1) and switch set
2 (SW2), use a small flat blade screwdriver to pop open the Model
1004's case as shown in Figure 4.
DCE/DTE
Switch
Surge
Suppressors
(1004S only)
2-Wire/4-Wire
Switch
“ON”
Terminal
Block
Control
Switches
“OFF”
1
2
3
4
SW1
SW2
Figure 1. Model 1004 board, showing switch locations
Figure 3. Close up of switches SW1 and SW2 on the PC board
3.1 SETTING THE DCE/DTE SWITCH
For your convenience, the Model 1004 has an externally accessi-
ble DCE/DTE switch (Figure 2). If the device connected to the Model
1004 is a modem or multiplexer (or is wired like one), set the switch to
“DTE”. This setting causes the Model 1004 to behave like Data
Terminal Equipment and transmit data on pin 2.
If the device connected to the Model 1004 is a PC, terminal or
host computer (or is wired like one), set the switch to “DCE”. This set-
ting causes the Model 1004 to behave like Data Communications
Equipment and transmit data on pin 3.
DCE
DTE
Figure 2. Close up of the external DCE/DTE switch
Figure 4. Opening the Model 1004's plastic case with a small screwdriver
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3.2.1 SWITCH SETTINGS
SW 1-4: Impedance
All possible settings for the Model 1004’s configuration switches
are presented in the summary table below. If you have additional
questions, contact Technical Support at (301) 975-1000.
Switch SW1-4 defines a termination resistance. The Model 1004’s
generator can drive 50 unit loads including two termination resistances
of 120 Ohms each.
SWITCH SUMMARY TABLE
SW1-4
Off
On
Setting
High (120K Ohm)
Low (120 Ohm)
Position
SW1-1
SW1-2
SW1-3
SW1-4
SW2
Function
RTS/CTS Delay
Echo Enable
Carrier Control
Impedance
Off Position
0mS
On Position
8mS
Echo “Off”
Echo “On”
Constantly “On”
High (120K Ohm)
2-wire
Controlled by RTS
Low (120 Ohm)
4-wire
SW 2: 2-Wire/4-Wire
Switch SW1-4 determines whether the Model 1004 will operate in
either 2-wire or 4-wire mode.
2 wire/4 wire
SW 1-1: RTS/CTS Delay
SW1-4
Off
On
Setting
2-wire
4-wire
The setting for Switch SW1-1 determines the amount of delay
between the time the Model 1004 “sees” RTS and when it sends CTS.
(This option is available in DCE mode only).
3.2.2 CONFIGURATION SWITCH APPLICATIONS
SW1-1
Off
On
Setting
0mS
8mS
The table below shows you how to set the Model 1004's configu-
ration switches to fit several common applications. If you have any
questions, call Patton Technical Support at (301) 975-1007.
TYPICAL SWITCH APPLICATIONS
SW 1-2: Echo Enable
Point-to-Point
4W HDX
Multi-point
2W
Switch
Settings
Switch SW1-2 determines whether the Model 1004 echoes data
back to the transmitting device. (Half duplex modes only).
4W
2W
4W
SW1-2
Off
On
Setting
Echo Off
Echo On
SW1-1: RTS/CTS*
SW1-2: Echo
ON
OFF
OFF
ON
ON
ON
ON
OFF
ON
ON
ON
ON
OFF
ON
SW1-3: Carrier
Master-OFF
Slaves-ON
SW 1-3: Carrier Control Method
SW1-4: Impedance
SW2: 2-wire/4-wire
ON
ON
ON
ON
ON
Master - ON
Slaves - HIGH
Last Slave - ON
Switch SW1-3 determines whether the carrier is “constantly on” or
“controlled by RTS”. This setting allows for operation in switched carri-
er, multipoint and/or hardware handshaking applications.
OFF
ON
OFF
SW1-3
Off
On
Setting
Constantly “on”
Controlled by RTS
*NOTE: RTS/CTS Delay setting should be based upon transmission timing.
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4.0 INSTALLATION
3. Strip the insulation on each of the twisted pair wires about .25”.
Once the Model 1004 is properly configured, it is ready to connect
to your system. This section tells you how to properly connect the
Model 1004 to the twisted pair and RS-232 interfaces, and how to
operate the Model 1004.
4.1 TWISTED PAIR CONNECTION
4. In a two pair circuit, connect one pair of wires to XMT+ and
XMT- (transmit positive and negative) on the terminal block, making
careful note of which color is positive and which color is negative.
The Model 1004 supports data-only communication between two
RS-232 devices at distances to 9.4 miles and data rates to 115.2 Kbps.
There are two essential requirements for installing the Model 1004:
1. These units work in pairs. Therefore, you must have one Model
1004 at each end of a two twisted pair interface. In multipoint
environments, there must be one Model 1004 at the RS-232 host
and one at each RS-232 terminal.
5. Connect the other pair of wires to RCV+ and RCV- (receive
positive and negative) on the terminal block, again making careful note
of which color is positive and which color is negative.
2. To function properly, the Model 1004 needs two twisted pairs of
metallic wire. These pairs must be unconditioned dry metallic
wire, between 19 and 26 AWG (the higher number gauges may
limit distance). Standard dial-up telephone circuits, or leased cir-
cuits that run through signal equalization equipment, are not
acceptable.
Ultimately, you will want to construct a two pair crossover cable that
makes a connection with the two Model 1004s as shown below.
XMT+--------------------------------------------------RCV+
One Pair
}
XMT- --------------------------------------------------RCV-
G ----------------------To Shield (Optional)
G
For your convenience, the Model 1004 is available with several
different twisted pair interfaces: RJ-11 jack, RJ-45 jack, terminal
blocks with strain relief and dual modular jacks (for multipoint daisy-
chaining).
RCV+--------------------------------------------------XMT+
RCV- --------------------------------------------------XMT-
One Pair
}
4.1.1 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
6. In a single pair circuit, use only the transmit (XMT) pair as
If your application requires you to connect one or two pairs of bare
wires to the Model 1004, you will need to open the case to access the
terminal blocks. The following instructions will tell you how to open the
case, connect the bare wires to the terminal blocks and fasten the
strain relief collar in place so the wires won't pull loose.
XMT+--------------------------------------------------XMT+
XMT- --------------------------------------------------XMT-
shown below:
1. You should already have the case open for the configuration
procedure. If not, see Section 3.2.
7. If there is a shield around the telephone cable, it may be con-
nected to “G” on the terminal block. To avoid ground loops, we recom-
mend connecting the shield at the computer end only. A ground wire is
not necessary for proper operation of the Model 1004.
2. Strip the outer insulation from the twisted pair(s) about one
inch from the end.
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8. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
10. Insert the strain relief assembly and wire into the slot in the
bottom half of the modem case. Set it into the recess in the case.
9. Place the 2 halves of the strain relief assembly on either side
of the telephone wire and press together very lightly. Slide the assem-
bly so that it is about 2 inches from the terminal posts and press
together firmly. If your cable diameter is too small or too large for our
strain relief, please contact our technical support. We have strain relief
assemblies to accommodate most cable diameters.
11. BEND the top half of the case as necessary to place it over
the strain relief assembly. Do not snap the case together yet.
12. Insert one captive screw through a saddle washer. Then
insert the entire piece through the hole in the DB-25 end of the case.
Snap that side of the case closed. Repeat the process for the other
side. This completes cable installation.
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4.1.2 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
RJ-45 Cable (4-Wire)
The RJ-11 and RJ-45 connectors on the Model 1004’s twisted pair
interface are pre-wired for a standard TELCO wiring environment. The
signal/pin relationships are shown below:
SIGNAL
PIN#
PIN#
SIGNAL
GND†
RCV-
XMT+
XMT-
RCV+
GND†
2-----------------------7
3-----------------------5
4-----------------------6
5-----------------------3
6-----------------------4
7-----------------------2
GND†
XMT-
RCV+
RCV-
XMT+
GND†
RJ-11
SIGNAL
RJ-45
SIGNAL
1...................GND†
2...................RCV-
3...................XMT+
4...................XMT-
5...................RCV+
6...................GND
1...................N/C
2...................GND
3...................RCV-
4...................XMT+
5...................XMT-
6...................RCV+
7...................GND
8...................N/C
RJ-11 Cable (2-Wire)
SIGNAL
PIN#
PIN#
SIGNAL
†Connection to ground is optional
XMT+
XMT-
3-----------------------3
4-----------------------4
XMT+
XMT-
1
2
3
4
5
6
7
8
1
2
3
4
5
6
RJ-45 Cable (2-Wire)
SIGNAL
PIN#
PIN#
SIGNAL
XMT+
XMT-
4-----------------------4
5-----------------------5
XMT+
XMT-
AT&T standard modular color codes
When connecting two Model 1004’s, it is necessary to use a
crossover cable. The diagrams below show how a crossover cable
should be constructed for the following environments: 4-wire RJ-11,
4-wire RJ-45, 2-wire RJ-11 or 2-wire RJ-45.
†Connection to ground is optional
4.2 WIRING FOR MULTIPOINT CIRCUITS
RJ-11 Cable (4-Wire)
The Model 1004 supports multi-point applications using either a
star or daisy chain topology. Both topologies require special wiring, as
well as specific DIP switch settings for master and slave units. Note:
Refer to Section 3.2.2 for multipoint DIP switch settings.
SIGNAL
PIN#
PIN#
SIGNAL
GND†
RCV-
XMT+
XMT-
RCV+
GND†
1-----------------------6
2-----------------------4
3-----------------------5
4-----------------------2
5-----------------------3
6-----------------------1
GND†
XMT-
RCV+
RCV-
XMT+
GND†
4.2.1 STAR TOPOLOGY
Using a star topology, you may connect several Model 1004s
together in a master/slave arrangement. Maximum distance between
the units will vary based upon the number of drops, data rate, wire
gauge, etc. Call Technical Support for specific distance estimates.
†Connection to ground is optional
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Figure 4 shows how to wire the two-pair cables properly for a
Model 1004 star topology. Note that the ground connection is not
needed.
With the dual modular units, you won't need to build cumbersome
“Y” cables for your daisy chain application. Simply use a crossover
cable to go between the host and the first slave (see Section 4.1.2 for
crossover cable wiring instructions), and straight through cables
between the slaves.
HOST
FIRST SLAVE
SECOND SLAVE
XMT+
RCV+
4.3 CONNECTION TO THE RS-232 INTERFACE
RCV+
Once you have properly configured the Model 1004 and connect-
ed the twisted pair wires correctly, simply plug the Model 1004 directly
into the DB-25 port of the RS-232 device. Remember to insert and
tighten the two captive connector screws.
XMT-
RCV+
RCV-
RCV-
XMT+
XMT-
RCV-
XMT+
XMT-
(Note: If you must use a cable to connect the Model 1004 to the
RS-232 device, make sure it is a straight through cable of the shortest
possible length—we recommend 6 feet or less).
Figure 4. Star wiring for Model 1004 host and slaves
4.4 OPERATING THE MODEL 1004
Once the Model 1004 is properly installed, it should operate trans-
parently—as if it were a standard cable connection. Operating power
is derived from the RS-232 data and control signals; there is no
“ON/OFF” switch. All data signals from the RS-232 and RS-485 inter-
faces are passed straight through. Additionally, one hardware flow
control signal is passed in each direction.
4.2.2 DAISY CHAIN TOPOLOGY
Using a daisy chain topology, you may connect several Model
1004s together in a master/slave arrangement. Maximum distance
between the units will vary based upon the number of drops, data rate,
wire gauge, etc. Call Technical Support for specific distance estimates.
Figure 5 shows how to wire the two-pair cables properly for a
Model 1004 daisy chain topology. Note that the ground connection is
not needed.
HOST
FIRST SLAVE
OTHER SLAVE(S)
XMT+---------------------RCV+-----------------------RCV+
XMT- --------------------RCV- -----------------------RCV-
RCV+---------------------XMT+-----------------------XMT+
RCV- --------------------XMT- -----------------------XMT-
Figure 5. Daisy chain wiring for Model 1004 host and slaves
Optional Connection: Dual Modular Jacks
To facilitate daisy chaining, the Model 1004 is available in a
“DRJ11” (dual RJ-11) or “DRJ45” (dual RJ-45) version. These units
have two specially wired modular jacks for twisted pair connection.
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APPENDIX A
APPENDIX B
SPECIFICATIONS
RS-232 PIN CONFIGURATIONS
Transmission Format: Asynchronous
DIRECTION
“DCE” SETTING
DIRECTION
Data Rate: Up to 115,200 bps
Transmit Line: 2, 4 wire unconditioned twisted pair
Transmit Mode: Full or half duplex
Transmit Level: 0 dBm
1- (FG) Frame Ground
2- (TD) Transmit Data
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
To Model 1004
From Model 1004
To Model 1004
From Model 1004
From Model 1004
To Model 1004
Data Term. Ready (DTR) - 20
8- (DCD) Data Carrier Detect From Model 1004
Range: Up to 9 miles
Control Signals: In DCE mode, DSR turns “ON” immediately after the
terminal raises DTR; DCD turns “ON” after recogniz
ing the receive signal from the line; CTS turns on
after the terminal raises RTS
Carrier: The carrier is switch selected either continuous operation or
DIRECTION
“DTE” SETTING
DIRECTION
switched operation, controlled by RTS
1- (FG) Frame Ground
Surge Protection: 600W power dissipation at 1 mS and response
2- (TD) Transmit Data
From Model 1004
To Model 1004
From Model 1004
To Model 1004
To Model 1004
time less than 1.0 pS
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect
Power: No external power required, uses ultra low power from EIA
data and control signals
From Model 1004 Data Term. Ready (DTR) - 20
To Model 1004
Size: 2.66” x 2.10” x 0.73”
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APPENDIX C
BLOCK DIAGRAM
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