Connecting serial devices, Db9 connectors – Comtrol UP DeviceMaster Installation User Manual
Page 41

Hardware Installation and Configuration Guide: 2000451 Rev. J
Connecting Serial Devices - 41
Connecting Serial Devices
This section discusses connecting your serial devices to the DeviceMaster UP. It
also provides you with information to build serial cables and loopback connectors
to test the serial ports.
•
•
•
•
Building the Serial Ribbon Cable
on Page 16 for connector
information for the DeviceMaster UP 1-Port Embedded adapter.
Make sure that you have configured the ports using the NS-Link driver
or SocketServer for the correct communications mode before
connecting any devices. The default mode is RS-232. There is a remote
possibility that connecting a serial device for the wrong mode could
damage the serial device.
Note:
If you have a DeviceMaster UP with 16-ports, use the DeviceMaster UP 16-
Port Hardware User Guide because the RJ45 connectors are different.
Note:
DB9 Connectors
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)
•
•
Caution
DB9 Connector Pinouts
Pin RS-232
RS-422
RS-485 Full-Duplex (Master/Slave)†
RS-485
Half-Duplex
1
DCD
Not used
Not used
2
RxD
RxD-
Not used
3
TxD
TxD-
TRxD-
4
DTR
Not used
Not used
5
GND
GND
GND
6
DSR
Not used
Not used
7
RTS
TxD+
TRxD+
8
CTS
RxD+
Not used
9
RI
Not used
Not Used
†
Only 2-port models support RS-485 full-duplex.