Serial terminal (8) null-modem cables (rs-232) – Comtrol Hub DeviceMaster User Manual
Page 100
100 - Connecting Serial Devices
DeviceMaster Installation and Configuration Guide: 2000594 Rev. A
Connecting Serial Devices
Serial Terminal (8)
Null-Modem Cables
(RS-232)
An RS-232 null-modem
cable is required for
connecting DTE devices.
RS-232
CD
DSR RI
DTR TxD
RTS
RxD
CTS
RS-422/RS-485
Full-Duplex
N/A N/A
N/A N/A TxD-
TxD+
RxD- RxD+
RS-485 Half-
Duplex
N/A N/A
N/A N/A TRxD-
TRxD+
N/A
N/A
† RS-232 ground must be connected to the appropriate signal ground
terminal.
† Wire gauge: AWG 12-22
Signal
Ground
Not connected
Positive†
Return†
5-30VDC
Signal
Ground†
Chassis
Ground†
RS-232: Connecting the Ground
RS-232 Null-Modem Cable
CD
DSR
RI
DTR
RTS
TxD
RxD CTS
DCD DTR
RI
DSR
CTS
RxD
TxD
RTS
1
4
9
6
8
3
7
8
20
22
6
5
3
2
4
DB9
DB25
2
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