Db9 Connectors - Comtrol DeviceMaster MOD Series Hardware Installation And Configuration Manual

Connecting Serial Devices

DB9 Connectors

46 - Connecting Serial Devices
This subsection provides the following information:
• Connector pin assignments (below)
• DB9 Null-Modem Cables (RS-232)
• DB9 Null-Modem Cables (RS-422)
• DB9 Straight-Through Cables (RS-232/485)
• DB9 Loopback Plugs
• Connecting DB9 Serial Devices
Pin RS-232
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
† The following models support RS-485 full-duplex:
• 1-Port DIN rail models
• 2-Port DIN rail models
• 4-Port DIN rail models
Refer to the hardware manufacturer's installation documentation if you need help
with connector pinouts or cabling for the serial device. This illustrates the DB9
connector signals.
RS-232
GND
RI
DTR
CTS
TxD
RTS
RxD
DSR
CD
Pin 6
Pin 1
DB9 Male
DeviceMaster MOD | UP Hardware Installation and Configuration Guide: 2000630 Rev. B
on Page 47
on Page 47
on Page 48
on Page 48
DB9 Connector Pinouts
RS-422
RS-485 Full-Duplex
(Master/Slave)†
Not used
RxD-
TxD-
Not used
GND
Not used
TxD+
RxD+
Not used
RS-422
GND
Not used
Not used
RxD+
TxD-
TxD+
RxD-
Not used
Not used
Pin 6
Pin 1
DB9 Male
on Page 47
RS-485
Half-Duplex
Not used
Not used
TRxD-
Not used
GND
Not used
TRxD+
Not used
Not Used
RS-485
GND
Not used
Not used
Not used
TRxD-
TRxD+
Not used
Not used
Not used
Pin 6
Pin 1
DB9 Male