Patton electronic Network Card 2085 User Manual

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  
 
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  
[email protected]. Packages received without an RMA number  
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.  
2
 
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.  
3
 
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.  
4
 
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  
5
 
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  
6
 
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  
7
 
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  
8
 
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.  
9
 
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  
10  
 
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-  
11  
 
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)  
12  
 
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.  
13  
 
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  
14  
 
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.  
15  
 
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”  
16  
 
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  
 
 
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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