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is a straight through cable of the shortest possible length—we
recommend 6 ft or less. The DB-9 connector on the Model 2089 is
wired according to the EIA/TIA-574 Standard, as shown below:
Note: The Model 2089 is configured as a DCE (Data
Communications Equipment), and is therefore designed to connect to a
DTE (Data Termination Equipment). If you need to connect the Model
2089 to another DCE device, please call Patton Technical Support at
(301) 975-1007 for details on constructing the proper crossover cable.
4.4 OPERATING THE MODEL 2089
Once the Model 2089 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 .
Transmission Format:
Data Rate:
Range:
Serial Interface:
Transmit Line:
Transmit Mode:
Control Signals:
RTS/CTS Delay:
EIA/TIA-574 Standard
DB-9
1 -----------------CD
2 -----------------RD
3 -----------------TD
4 -----------------DTR
5 -----------------SG/FG
6 -----------------DSR
7 -----------------RTS
8 -----------------CTS
9 -----------------(Optional 6-12 VDC Power)
APPENDIX A
MODEL 2089 SPECIFICATIONS
Asynchronous
Up to 115,200 bps
Up to 9 miles
DB-9, male or female; wired as a DCE
according to EIA/TIA-574 Standard.
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.
8 mSec or "no delay"
16
SIGNAL
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