Screw Terminal (9) Null-Modem Rs-422 Cables; Screw Terminal (9) Rs-232/485 Straight-Through Cables; Screw Terminal (9) Loopback Signals - Comtrol DeviceMaster MOD Series Hardware Installation And Configuration Manual

Screw Terminal (9)
Null-Modem RS-422
Cables
Screw Terminal (9)
RS-232/485 Straight-
Through Cables
Screw Terminal (9)
Loopback Signals
DeviceMaster MOD | UP Hardware Installation and Configuration Guide: 2000630 Rev. B
An RS-422 null-modem cable is required for connecting DTE devices.
CD DSR RI
Note: RS-422 pinouts are not standardized. Each peripheral manufacturer uses
different pinouts. Please refer to the documentation for the peripheral to
determine the pinouts for the signals above.
RS-232 or RS-485 straight-through cables are used to connect modems and other
DCE devices.
CD
DCD DSR
1
DB9
8
DB25
Use this drawing to wire a loopback, which is used in conjunction with application
software to test serial ports.
CD DSR
Wire the terminals together to create a loopback.
• TxD to RxD
• RTS to CTS to RI
• DTR to CD to DSR
RS-422 Null-Modem Cable
DTR TxD RTS
RxD- RxD+
DB9 2
DB25
3
RS-232/485 Straight-Through Cable
DSR RI DTR TxD
RI DTR TxD
or
TRxD- TRxD+
6 9 4 3
6 22 20 2
RI DTR TxD RTS
Connecting Serial Devices
RxD CTS Sig Gnd
Gnd
TxD- TxD+
8 3 7
5
7
5 2 4
Sig Gnd
RTS RxD CTS
RTS RxD CTS Gnd
or
7 2 8 5
4 3 5
7
RxD CTS
Connecting Serial Devices - 59