Patton electronic TV Converter Box 285 User Manual

USER  
MANUAL  
MODEL 285  
and 285S  
RS-232 to RS-485  
Interface Converters  
Revision C and above  
SALES OFFICE  
(301) 975-1000  
TECHNICAL SUPPORT  
(301) 975-1007  
Part# 07M285-B  
Doc# 047012UB  
Revised 9/29/93  
 
3.0 CONFIGURATION  
The Model 285 is configured using six PC board mounted switch-  
es. Figure 1 (below) shows the switch locations, along with the loca-  
tion of the terminal blocks and optional surge protectors:  
3.2 SETTING CONFIGURATION SWITCHES SW1 AND SW2  
The five switches shown in Figure 3 (below) configure the Model  
285 for RTS/CTS delay, echo, method of carrier control, impedance,  
and 2-wire/4-wire operation. These switches are located internally on  
the Model 285's PC board. To access SW1 and SW2, use a small flat  
blade screw driver to pop open the Model 285's case as shown in  
Figure 4 (below):  
DCE/DTE  
Surge  
Switch  
Suppressors  
(285S only)  
"ON"  
2-wire/4-wire  
Switch  
Terminal  
Block  
Control  
Switches  
"OFF"  
SW1  
SW2  
Figure 1. Model 285 board, showing switch locations  
Figure 3. Close up of switches SW1 and SW2 on the PC board  
3.1 SETTING THE DTE/DCE SWITCH  
For your convenience, the Model 285 has an externally accessi-  
ble DTE/DCE switch (see Figure 2, below). If the device connected to  
the Model 285 is a modem or multiplexer (or is wired like one), set the  
switch to "DTE". This setting causes the Model 285 to behave like  
Data Terminal Equipment and transmit data on pin 2.  
If the device connected to the Model 285 is a PC, terminal or host  
computer (or is wired like one), set the switch to "DCE". This setting  
causes the Model 285 to behave like Data Communications Equipment  
and transmit data on pin 3.  
DCE  
DTE  
Figure 2. Close up of external DCE/DTE switch  
Figure 4. Opening the Model 285's plastic case with a small screw driver  
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3.2.1 CONFIGURATION SWITCH FUNCTIONS  
3.2.2 CONFIGURATION SWITCH APPLICATIONS  
The table and descriptions below detail the functions of the five  
configuration switches. Read this information carefully before setting  
the switches.  
The table below shows you how to set the Model 285's configu-  
ration switches to fit several common applications. If you have any  
questions about the proper settings for your application, call Patton  
Technical Support at (301) 975-1007.  
SWITCH SUMMARY TABLE  
Position  
SW1-1  
SW1-2  
SW1-3  
SW1-4  
SW2  
Function  
RTS/CTS Delay  
Echo Enable  
Carrier Control  
Impedance  
Off Position  
0 mSec  
On Position  
8 mSec  
TYPICAL SWITCH APPLICATIONS  
Point-to-Point  
4W HDX  
Multi-point  
2W  
Switch  
Settings  
Echo "Off"  
Echo "On"  
Constantly "On" Controlled by RTS  
4W  
2W  
4W  
High (120K Ohm)  
2-wire  
Low (120 Ohm)  
4-wire  
RTS/CTS (SW1-1)*  
Echo (SW1-2)  
ON  
OFF  
OFF  
ON  
ON  
ON  
ON  
OFF  
ON  
ON  
ON  
ON  
OFF  
ON  
2 wire/4 wire  
Carrier (SW1-3)  
Master-OFF  
Slaves-ON  
SW1-1: RTS/CTS Delay: Switch 1-1 determines how long cir-  
cuit CB (CTS) takes to become active after RTS is asserted (DCE  
Mode only). RTS delay of 8 mSec will give any signal from any other  
device time to clear the transmit line. In DTE mode, CTS is open.  
Impedance (SW1-4)  
2wire/4wire (SW2)  
ON  
ON  
ON  
ON  
ON  
Master - ON  
Slaves - HIGH  
Last Slave - ON  
OFF  
ON  
OFF  
SW1-2: Echo Enable: With Switch 1-2 in the ON position, the  
285 echoes transmitted data back to the transmitting device. This is  
so the user can see what is being transmitting to the remote device.  
(Typically used in half duplex modes only).  
*NOTE: RTS/CTS Delay (SW1-1) setting should be based upon transmission timing.  
SW1-3: Carrier: With Switch 1-3 in the ON position, the 285  
transmitter operation follows circuit CA (Request to Send). When RTS  
is low, the 285 transmitter operation is off (0V) (DCE mode only).  
3.2.3 WHEN YOU'RE FINISHED CONFIGURING...  
Once you've finished setting the Model 285's configuration  
switches, pause before you snap the case halves back together. If you  
are connecting the RS-485 interface using the internal terminal blocks,  
go to Section 4.1.3 and continue the installation procedure. If you are  
connecting the RS-485 interface using RS-11, RS-45 or DB-25, go  
ahead and snap the case halves back together now (don't force a fit—  
make sure all the pieces are properly set before snapping the case  
halves shut).  
SW1-4: Impedance: Switch 1-4 defines a termination resist-  
ance.The 285 transmitter can drive 50 unit loads including two termina-  
tionresistances of 120 Ohms each.  
SW2: 2 Wire/ 4 Wire: Switch 2 determines 2 wire (half duplex)  
or 4 wire operation.  
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4.0 INSTALLATION  
4.1.2 4-WIRE CONNECTION USING RJ-11 OR RJ-45  
Once you have properly set the configuration switches, you are  
ready to connect the Model 285 to your system. This section tells you  
how to properly connect the Model 285 to the RS-485 and RS-232  
interfaces, and how to operate the Model 285.  
The RJ-11 and RJ-45 connectors on the Model 285'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  
4.1 CONNECTION TO THE RS-485 INTERFACE  
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  
To function properly, the Model 285 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 285 is available with several dif-  
ferent 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.  
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 285  
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.  
4.1.1 4-WIRE CONNECTION USING THE DB-25  
The DB-25 connector on the Model 285'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 285  
SIGNAL PIN#  
RS-485 DEVICE  
422 SIGNAL  
PIN#  
GND*  
RCV-  
XMT+  
XMT-  
RCV+  
GND  
1
2
3
4
5
6
MODEL 285  
RS-485 (530) DEVICE  
.........................4  
XMT-  
RCV+  
RCV-  
XMT+  
SIGNAL  
DB-25 PIN  
DB-25 PIN  
SIGNAL  
RCV+  
.........................5  
.........................2  
.........................3  
XMT+  
XMT-  
2...........................3  
14...........................16  
RCV-  
RCV+  
RCV-  
3...........................2  
16...........................14  
XMT+  
XMT-  
*Connection to ground is optional  
NOTE: It is not necessary that the RS-485 device adhere to the RS-530 stan-  
dard. However, you must make sure that the signals, polarities, and pairing of  
your connection conform to the above diagram.  
1
2
3
4
5
6
7
8
1
2
3
4
5
6
**Standard AT&T pin assignements - yours may be different.  
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4.1.3 4-WIRE CONNECTION USING TERMINAL BLOCKS  
6. If there is a shield around the telephone cable, it may be con-  
nected 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 285.  
If your RS-485 application requires you to connect two pairs of  
bare wires to the Model 285, 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.  
7. When you finish connecting the wires to the terminal block, the  
assembly should resemble the diagram below:  
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".  
8. 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.  
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 285  
RS-485 Device  
XMT+.............................RCV+  
XMT-..............................RCV-  
RCV+.............................XMT+  
RCV-..............................XMT-  
(continued)  
10  
9
 
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.  
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 285 to  
"two wire" mode—then use only the transmit (XMT) pair as shown  
below:  
285 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.  
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.  
4.2 CONNECTION TO THE RS-232 INTERFACE  
Once you have properly configured the Model 285 and connected  
the twisted pair wires correctly, all that remains is to plug the 285  
directly into the DB-25 port of the RS-232 device. After doing so,  
remember to insert and tighten the two captive connector screws.  
(Note: If you must use a cable to connect the Model 285 to the RS-232  
device, make sure it is a straight through cable of the shortest possible  
length—we recommend 6 feet or less).  
4.3 OPERATING THE MODEL 285  
Once the Model 285 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.  
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.  
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12  
 
APPENDIX A  
APPENDIX B  
SPECIFICATIONS  
RS-232C PIN CONFIGURATIONS  
Transmission Format: Asynchronous  
Data Rate: Up to 115,200 bps  
DIRECTION  
STANDARD "DCE" SETTING  
DIRECTION  
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 285  
From Model 285  
To Model 285  
Transmit Line: 2, 4 wire unconditioned twisted pair  
Transmit Mode: Full or half duplex  
Transmit Level: 0 dBm  
From Model 285  
From Model 285  
To Model 285  
Data Term. Ready (DTR) - 20  
8- (DCD) Data Carrier Detect From Model 285  
Range: Up to 9 miles  
Control Signals: 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  
DIRECTION  
STANDARD "DTE" SETTING  
DIRECTION  
Carrier: The carrier is strap selected either continuous operation or  
switched operation, controlled by RTS  
1- (FG) Frame Ground  
2- (TD) Transmit Data  
3- (RD) Receive Data  
From Model 285  
To Model 285  
From Model 285  
To Model 285  
To Model 285  
Surge Protection: 600W power dissipation at 1 mS and response  
time less than 1.0 pS  
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: None required, uses ultra low power from EIA data and con  
trol signals  
From Model 285 Data Term. Ready (DTR) - 20  
To Model 285  
Size: 2.66" x 2.10" x 0.73"  
13  
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APPENDIX C  
BLOCK DIAGRAM  
15  
 

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