Serial Terminal (4) Null-Modem Cables (Rs-232); Serial Terminal (4) Null-Modem Cables (Rs-422); Serial Terminal (4) Straight-Through Cables (Rs-232/485) - Comtrol DeviceMaster MOD Series Hardware Installation And Configuration Manual

Serial Terminal (4)
Null-Modem Cables
(RS-232)
Serial Terminal (4)
Null-Modem Cables
(RS-422)
Serial Terminal (4)
Straight-Through
Cables (RS-232/485)
DeviceMaster MOD | UP Hardware Installation and Configuration Guide: 2000630 Rev. B
An RS-232 null-modem cable is required for
connecting DTE devices.
An RS-422 null-modem cable is required for
connecting DTE devices.
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.
Connecting Serial Devices
RS-232 Null-Modem Cable
TxD RTS
RxD CTS
2 8
DB9
DB25 3 5
RS-422 Null-Modem Cable
TxD RTS RxD
RxD- RxD+
2 8
DB9
DB25 3 5
RS-232/422 Straight-Through Cable
TxD RTS RxD
TxD RTS RxD
or
or
TRxD- TRxD+
3 7
DB9
DB25 2 4
Connecting Serial Devices - 53
RxD CTS
TxD RTS
3 7
2 4
CTS
TxD- TxD+
3
7
2 4
CTS
CTS
2 8
3 5