Screw Terminal (8) Null-Modem Cables (Rs-232); Screw Terminal (8) Null-Modem Cables (Rs-422); Screw Terminal (8) Straight-Through Cables (Rs-232/485) - Comtrol DeviceMaster MOD Series Hardware Installation And Configuration Manual

Connecting Serial Devices
Screw Terminal (8)
Null-Modem Cables
(RS-232)
Screw Terminal (8)
Null-Modem Cables
(RS-422)
Screw Terminal (8)
Straight-Through
Cables (RS-232/485)
56 - Connecting Serial Devices
An RS-232 null-modem
cable is required for
connecting DTE devices.
An RS-422 null-modem cable is
required for connecting DTE
devices.
RS-232 or RS-485 straight-
through cables are used to
connect modems and other
DCE devices.
DeviceMaster MOD | UP Hardware Installation and Configuration Guide: 2000630 Rev. B
RS-232 Null-Modem Cable
CD DSR RI
DCD DTR RI
1 4 9
DB9
8 20 22
DB25
RS-422 Null-Modem Cable
CD DSR RI
RS-232/485 Straight-Through Cable
CD DSR RI
DCD DSR RI
1 6 9
DB9
8 6 22
DB25
DTR TxD RTS RxD CTS
DSR RxD CTS TxD RTS
6 2 8 3
6 3 5 2
DTR TxD RTS RxD CTS
RxD- RxD+ TxD- TxD+
DB9 2 8 3
DB25
3 5 2
DTR TxD RTS RxD CTS
DTR TxD RTS RxD CTS
or or
TRxD- TRxD+
4 3 7 2
20 2 4 3
7
4
7
4
8
5