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User manual Version 1.3
4-Port DIN-Rail Serial Device Server SE5404D
Copyright © 2011 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan.
- 72 -
A.3.2.1 DB9 Pin Assignments
The pin assignments of DB9 connector on SE5404D is shown in the following table:
Pin#
RS-232
Full Duplex
RS-422/4-Wire RS-485
Full Duplex
2-Wire RS-485
Half Duplex
1
DCD
N/A
N/A
2
RXD
TXD+
N/A (reserved)
3
TXD
RXD
+
DATA+
4
DTR
N/A
N/A
5
SG (Signal Ground)
SG (Signal Ground)
SG (Signal Ground)
6
DSR
N/A
N/A
7
RTS
RXD-
DATA-
8
CTS
TXD-
N/A (reserved)
9
RI
N/A
N/A