USER
MANUAL
MODEL 2085
High Speed RS-232
to RS-485 Interface
Converter
SALES OFFICE
Part# 07M2085-D
Doc# 047033U,
Rev. E
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
Revised 1/22/08
C
E
R
T
I
F
I
E
D
An ISO-9001
Certified Company
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1.3 SERVICE
All warranty and non-warranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
will not be accepted.
Patton Electronics’ technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Model 2085. Technical Service hours: 8AM to 5PM EST, Monday
through Friday.
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2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor. If any questions or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at (301) 975-1007.
2.1 FEATURES
• Operates asynchronously, point to point or multipoint,
over 2 or 4 wires
• Up to 50 multipoint device drops in a polling environment
• Data rates to 115.2 Kbps
• Passes transmit & receive data, one control signal each direction
• No AC power or batteries are required
• Variable high/low impedance settings
• Able to operate with or without “echo”
• Carrier can be set as “constantly on” or “controlled by RTS”
• Compact size ( 2.66” x 2.10” x 0.73”)
• Twisted pair connection via strain relief, RJ-11 or RJ-45
• Silicon Avalanche Diode surge protection
2.2 DESCRIPTION
The Model 2085 High Speed RS-232 to RS-485 Interface
Converter provides exceptional versatility in a compact package.
Requiring no AC power or batteries for operation, the Model 2085
supports asynchronous RS-232 data rates to 115.2 Kbps over one or
two unconditioned twisted pair.
The Model 2085 passes one control signal in each direction and
can handle up to 50 terminal drops in a multipoint polling environment.
The Model 2085 may be configured for high or low impedance
operation, carrier may be set to “constantly on” or “controlled by RTS”,
and the unit can operate with or without “echo”. RTS/CTS delay may
be set for “no delay” or 8 mS.
The Model 2085 is equipped with either male or female DB-25 for
RS-232 connection. Options for twisted pair connection include
terminal blocks with strain relief, RJ-11, RJ-45 and DB-25 male or
female. Silicon Avalanche Diodes provide 600 watts per wire of
protection against harmful data line transient surges.
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3.0 CONFIGURATION
The Model 2085 is configured using an eight position DIP switch
and a DCE/DTE switch. Figure 1 (below) shows the location of the
DCE/DTE switch (externally accessible) on the PC board, as well as
the power supply daughter board and terminal block.
DCE/DTE
Switch
Terminal
Block
+RCV- G -XMT+
Figure 1. Top view of Model 2085 board, showing DCE/DTE switch.
Figure 2 (below) shows the location of the eight position DIP switch
on the underside of the Model 2085 PC board. Figure 3 (following
page) shows the orientation of the eight position DIP switch, with
respect to ON/OFF positions.
DIP Switch
S1
ON
1
2
3
4
5
6
7
8
Figure 2. Bottom view of Model 2085 board, showing (internal) DIP switch.
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ON
ON
1
2
3
4
5
6
7
8
OFF
Figure 3. Close-up of DIP switch showing “ON” and “OFF” positions
3.1 SETTING THE DCE/DTE SWITCH
For your convenience, the Model 2085 has an externally
accessible DCE/DTE switch. If the device connected to the Model
2085 is a modem or multiplexer (or is wired like one), set the switch to
“DTE”. This setting causes the Model 2085 to behave like Data
Terminal Equipment and transmit data on pin 2. If the device
connected to the Model 2085 is a PC, terminal or host computer (or is
wired like one), set the switch to “DCE”. This setting causes the Model
2085 to behave like Data Communications Equipment and transmit
data on pin 3.
3.2 DIP SWITCH CONFIGURATION
The eight switches on switch set S1 (see Figure 3, above)
configure the Model 2085 for echo mode, carrier control method,
RTS/CTS delay, “transmit off” impedance, receive impedance, and 2-
wire/4-wire operation. These switches are located internally on the
Model 2085's PC board. To access switch set S1, use a small flat
blade screwdriver to pop open the Model 2085's case as shown in
Figure 4, below.
Figure 4. Opening the Model 2085's plastic case with a small screwdriver
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3.3 DIP SWITCH SETTINGS
All possible settings for the Model 2085’s configuration switches
are presented in Figure 5 (below). Following Figure 5 is a detailed
description of each switch function. If you have additional questions,
S1 SUMMARY TABLE
Position
S1-1*
S1-2*
S1-3
S1-4
S1-5
S1-6
S1-7*
S1-8*
Function
“Transmit Off” Impedance
“Transmit Off” Impedance
RTS/CTS Delay
“ECHO” Mode
Carrier Control
Receive Impedance
2-Wire/4-Wire
Factory Default
Off
Off
High Z
}
On
Off
On
On
On
On
8 msec
Echo Off
RTS Cont.
120 Ohm
2-Wire
}
2-Wire/4-Wire
Figure 5. Summary of DIP switch default settings for set S1
contact Technical Support at (301) 975-1000.
*Note: Switches S1-1 & S1-2 should be switched simultaneously.
Switches S1-7 & S1-8 should also be switched simultaneously.
S1-1 and S1-2: “Transmit Off” Impedance
Switches S1-1 and S1-2 are set together to determine whether the
receiving device “sees” the impedance of the Model 2085’s transmitter
as being “high” or “intermediate” when the transmitter is turned off. The
“intermediate” setting is useful in half-duplex environments where the
receiving device does not respond well to the “high” setting.
S1-1
On
S1-2
On
Setting
Intermediate Impedance
High Impedance
Off
Off
S1-3: RTS/CTS Delay
The setting for switch S1-3 determines the amount of delay
between the time the Model 2085 “sees” RTS and when it sends CTS.
Note: RTS/CTS Delay setting should be based upon transmission
timing.
S1-3
Setting
On
8 mSec
no delay
Off
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S1-4: Echo Mode
The setting for switch S1-4 determines whether the Model 2085
echoes data back to the transmitting device (half-duplex mode only).
S1-4
On
Setting
Echo On
Echo Off
Off
S1-5: Carrier Control Method
The setting for switch S1-5 determines whether the carrier is
“Constantly On” or “Controlled by RTS”. This setting allows for
operation in switched carrier, multipoint and/or hardware handshaking
applications.
S1-5
Setting
On
Controlled by RTS
Constantly On
Off
S1-6: Receive Impedance
The setting for switch S1-6 selects the impedance of the input
receiver. You may select either a “low” impedance of 120 Ohms or a
“high” impedance of 16 kOhms. By selecting the proper impedance for
each drop, there may be up to 50 receivers in one application.
S1-6
On
Setting
Low (120 Ohm)
High (16 kOhm typical)
Off
S1-7 and S1-8: 2-Wire/4-Wire Modes
Switches S1-7 and S1-8 are set together to determine whether the
Model 2085 is in 2-wire or 4-wire operating mode. Note: 2-wire mode
is half-duplex only.
S1-7
On
S1-8
On
Setting
2-wire mode
4-wire mode
Off
Off
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3.4 CONFIGURATION SWITCH APPLICATIONS
The switch settings generally needed to configure the Model 2085
for various applications are shown in the table below. Note: Do not
change switch settings until you have carefully read Section 3.3.
TYPICAL MODEL 2085 APPLICATIONS
Point-to-Point
4W HDX
Multi-point
2W
Switch
Settings
4W
2W
4W
S1-1: “Xmt Off” Imp.
S1-2: “Xmt Off” Imp.
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
S1-3: RTS/CTS Delay
S1-4: Echo
ON
OFF
OFF
ON
OFF
ON
ON
OFF
ON
OFF
OFF
ON
OFF
ON
S1-5: Carrier Control
Master-OFF
Slaves-ON
S1-6: Rcv Impedance
ON
ON
ON
Master - ON
Slaves - OFF
Last Slave - ON
S1-7: 2-wire/4-wire
S1-8: 2-wire/4-wire
OFF
OFF
OFF
OFF
ON
ON
OFF
OFF
ON
ON
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4.0 INSTALLATION
Once you have properly set the configuration switches, you are
ready to connect the Model 2085 to your system. This section tells you
how to properly connect the Model 2085 to the RS-485 and RS-232
interfaces, and how to operate the Model 2085.
4.1 CONNECTION TO THE RS-485 INTERFACE
To function properly, the Model 2085 must have one or two twisted
pairs of metallic wire. These pairs must be "dry" (unconditioned)
metallic wire, between 19 and 26 AWG (the higher number gauges may
limit distance somewhat).
For your convenience, the Model 2085 is available with several
different physical interfaces on the RS-485 side: DB-25 (following the
RS-520 standard), RJ-11 jack, RJ-45 jack, and terminal blocks with
strain relief.
4.1.1 4-WIRE CONNECTION USING THE DB-25
The DB-25 connector on the Model 2085's RS-485 side conforms to
the RS-530 interface standard. When connecting to an RS-485 device
that also conforms to the RS-530 standard, your cable should be
"crossed over" in the manner shown below:
MODEL 2085
RS-485 (530) DEVICE
SIGNAL
DB-25 PIN
DB-25 PIN
SIGNAL
RCV+
RCV-
XMT+
XMT-
2...........................3
14...........................16
RCV+
RCV-
3...........................2
XMT+
XMT-
16...........................14
NOTE: It is not necessary that the RS-485 device adhere to the RS-530
standard. However, you must make sure that the signals, polarities, and pairing
of your connection conform to the above diagram.
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4.1.2 4-WIRE CONNECTION USING RJ-11 OR RJ-45
The RJ-11 and RJ-45 connectors on the Model 2085's RS-485 side
are pre-wired for a standard TELCO wiring environment. The signal/pin
relationships are shown below:
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
*Connection to ground is optional
1
2
3
4
5
6
7
8
1
2
3
4
5
6
In most modular RS-485 applications it is necessary to use a "cross
over" cable. The diagram below shows how a cross over cable should
be constructed for an environment where both the Model 2085 and the
RS-485 device use a 6-wire RJ-11 connector. Similar logic should be
followed when using RJ-45 connectors or a combination of the two.
MODEL 2085
SIGNAL PIN#
RS-485 DEVICE
PIN# RS-422 SIGNAL
†
GND
1 -------------------N/C
RCV-
XMT+
XMT-
RCV+
2 -------------------4
3 -------------------5
4 -------------------2
5 -------------------3
6 -------------------N/C
XMT-
RCV+
RCV-
XMT+
†
GND
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4.1.3 4-WIRE CONNECTION USING TERMINAL BLOCKS
If your RS-485 application requires you to connect two pairs of bare
wires to the Model 2085, 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 that the wires won't pull loose.
1. You should already have the case open for the configuration
procedure. If not, open the case according to the diagram in Section
3.2.
2. Strip the outer insulation from the twisted pairs about one inch
from the end.
3. Strip back the insulation on each of the 2 twisted pair wires
about .25".
4. 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.
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.
Ultimately, you will want to construct a two pair cross over cable that
makes a connection with the RS-485 device as shown below:
Model 2085
RS-485 Device
XMT+.............................RCV+
XMT-..............................RCV-
RCV+.............................XMT+
RCV-..............................XMT-
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6. If there is a shield around the telephone cable, it may be
connected to "G" on the terminal block. We recommend connecting the
shield at the computer end only to avoid ground loops. A ground wire is
not necessary for proper operation of the Model 2085.
7. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
8. Place the 2 halves of the strain relief assembly on either side of
the telephone wire and press together very lightly. Slide the assembly
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.
(continued)
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9. Insert the strain relief assembly with the wire going through it
into the slot in the bottom half of the modem case and set it into the
recess in the case.
10. BEND the top half of the case as necessary to place it over the
strain relief assembly. Do not snap the case together yet.
11. Insert one captive screw through a saddle washer and then
insert the captive screw with the washer on it, 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 the cable installation
process.
4.1.4 2-WIRE CONNECTION
Most RS-485 devices employ a two-wire, half duplex configuration.
When using this configuration, be sure to first set the Model 2085 to
"two wire" mode—then use only the transmit (XMT) pair as shown on
the following page.
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2085 SIGNAL
RS-485 SIGNAL
XMT+....................................+
XMT-.....................................-
The above wiring pattern applies regardless of whether you are
making the RS-485 connection via DB-25, RJ-11, RJ-45 or terminal
blocks. For specific wiring instructions, please refer to the previous
pages of Section 4.
4.2 WIRING FOR MULTIPOINT CIRCUITS
The Model 2085 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.
4.2.1 STAR TOPOLOGY
Using a star topology, you may connect several Model 2085s
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 7 (below) shows how to wire the two-pair cables properly for
a Model 2085 star topology. Note that the ground connection is not
needed.
HOST
FIRST SLAVE
SECOND SLAVE
RCV+
XMT+
RCV+
XMT-
RCV+
RCV-
RCV-
XMT+
XMT-
RCV-
XMT+
XMT-
Figure 7. Star wiring for Model 2085 host and slaves
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4.2.2 DAISY CHAIN TOPOLOGY
Using a daisy chain topology, you may connect several Model
2085s 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 8 (below) shows how to wire the two-pair cables properly for
a Model 2085 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 8. Daisy chain wiring for Model 2085 host and slaves
4.3 CONNECTION TO THE RS-232 INTERFACE
Once you have properly configured the Model 2085 and connected
the twisted pair wires correctly, simply plug the Model 2085 directly into
the DB-25 port of the RS-232 device. Remember to insert and tighten
the two captive connector screws.
(Note: If you must use a cable to connect the Model 2085 to the
RS-232 device, make sure it is a straight through cable of the shortest
possible length—we recommend 6 feet or less).
4.4 OPERATING THE MODEL 2085
Once the Model 2085 is properly installed, it should operate
transparently—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
interfaces are passed straight through. Additionally, one hardware flow
control signal is passed in each direction.
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APPENDIX A
PATTON MODEL 2085 SPECIFICATIONS
Transmission
Format:
Asynchronous
Up to 115,200 bps
Up to 9 miles
Data Rate:
Range:
RS-232 Interface:
DB-25, male or female (DCE/DTE
switchable)
RS-485 Interface
Options:
DB-25, male or female; RJ-11 or RJ-45 jack;
terminal block with strain relief
2, 4 wire unconditioned twisted pair
4-wire, full or half duplex; 2-wire half duplex
DSR turns “ON” immediately after the
terminal raises DTR; DCD turns “ON” after
recognizing the receive signal from the line;
CTS turns “ON” after the terminal raises
RTS.
Transmit Line:
Transmit Mode:
Control Signals:
RTS/CTS Delay:
Carrier:
8 mSec or “no delay”
The carrier is switch selected either
continuous operation or switched operation,
controlled by RTS
Surge Protection:
Power:
600W power dissipation at 1 mS
Draws operating power from RS-232 data
and control signals; no AC power or
batteries required.
Temperature:
Humidity:
Size:
0 to 50° C
5 to 95%, non-condensing
2.66” x 2.10” x 0.73”
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APPENDIX B
PATTON MODEL 2085 RS-232 PIN CONFIGURATIONS
DIRECTION
“DCE” SETTING
DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data
To Model 2085
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
From Model 2085
To Model 2085
From Model 2085
From Model 2085
To Model 2085
Data Term. Ready (DTR) - 20
8- (DCD) Data Carrier Detect From Model 2085
DIRECTION
“DTE” SETTING
DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data
From Model 2085
To Model 2085
From Model 2085
To Model 2085
To Model 2085
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
From Model 2085 Data Term. Ready (DTR) - 20
To Model 2085
Copyright ©
Patton Elec1tr7onics Company
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Dear Valued Customer,
Thank you for purchasing Patton Electronics products! We do appreciate
your business. I trust that you find this user manual helpful.
We manufacture one of the widest selections of data communications
products in the world including CSU/DSU's, network termination units,
powered and self-powered short range modems, fiber optic modems, interface
converters, baluns, electronic data switches, data-line surge protectors,
multiplexers, transceivers, hubs, print servers and much more. We produce
these products at our Gaithersburg, MD, USA, facility, and can custom
manufacture products for your unique needs.
We would like to hear from you. Please contact us in any of the following
ways to tell us how you like this product and how we can meet your product
needs today and in the future.
Web:
Sales E-mail:
Support E-mail:
Phone - Sales
Phone - Support
Fax:
(301) 975-1000
(301) 975-1007
(301) 869-9293
Mail:
Patton Electronics Company
7622 Rickenbacker Drive
Gaithersburg, MD 20879 USA
We are committed to a quality product at a quality price. Patton
Electronics is ISO 9001 certified. We meet and exceed the highest standards
in the industry (CE, UL, etc.).
It is our business to serve you. If you are not satisfied with any aspect of
this product or the service provided from Patton Electronics or its distributors,
please let us know.
Thank you.
Burton A.Patton
Vice President
P.S. Please tell us where you purchased this product.
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