Serial terminal (4) null-modem cables (rs-232), Serial terminal (4) null-modem cables (rs-422) – Comtrol UP DeviceMaster Installation User Manual
Page 48
48 - Connecting Serial Devices
Hardware Installation and Configuration Guide: 2000451 Rev. J
Connecting Serial Devices
Serial Terminal (4)
Null-Modem Cables
(RS-232)
An RS-232 null-modem cable is required for
connecting DTE devices.
Serial Terminal (4)
Null-Modem Cables
(RS-422)
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.
Serial Terminal (4)
Straight-Through
Cables (RS-232/485)
RS-232 or RS-485 straight-through cables
are used to connect modems and other DCE
devices.
RTS
RxD
TxD
CTS
CTS
TxD
RxD
RTS
8
2
3
7
5
3
2
4
DB9
DB25
RS-232 Null-Modem Cable
RTS
RxD
TxD
CTS
RxD+
TxD-
RxD-
TxD+
2
8
3
7
3
5
2
4
DB9
DB25
RS-422 Null-Modem Cable
RTS
RxD
TxD
CTS
RTS
RxD
TxD
CTS
3
7
2
8
2
4
3
5
DB9
DB25
or
TRxD-
or
TRxD+
RS-232/422 Straight-Through Cable