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DeviceMaster Installation and Configuration Guide
: 2000594 Rev. F
Connecting Serial Devices - 101
Connecting Serial Devices
Screw Terminal (9) Null-Modem RS-422 Cables
An RS-422 null-modem cable is required for connecting DTE devices.
Note:
RS-422 pin outs are not standardized. Each peripheral manufacturer uses different pin outs. Please
refer to the documentation for the peripheral to determine the pin outs for the signals above.
Screw Terminal (9) RS-232/485 Straight-Through Cables
RS-232 or RS-485 straight-through cables are used to connect modems and other DCE devices.
CD DSR RI DTR
RTS
TxD
RxD CTS
RxD+
RxD-
TxD- TxD+
8
2
3
7
5
3
2
4
DB9
DB25
RS-422 Null-Modem Cable
Sig Gnd
Gnd
5
7
RS-232/485 Straight-Through Cable
CD
DSR
RI
DTR
RTS
TxD
RxD CTS
DCD DSR
RI
DTR
RTS
TxD
RxD CTS
1
6
9
7
2
8
6
22
20
4
2
3
5
DB9
DB25
3
4
8
or
TRxD-
or
TRxD+
Sig Gnd
Gnd
5
7