10
Rockwell Automation Publication 2080-UM004C-EN-E - March 2015
Chapter 2
Install and Wire Your Module
Serial Port to Modem Cable Pinout
When connecting Micro800 to a modem using an RS-232 cable, the maximum
that the cable length may be extended is 15.24 m (50 ft).
ATTENTION:
Do not connect to pins A1 and B4 for RS-232
connections. This connection will cause damage to the RS-232/485
communication port.
DTE Device
(Micro800 RS232
Isolated Serial Port
Plug-in Module)
DCE Device
(Modem, and
so on)
8-Pin
25-Pin
9-Pin
B3
TXD
TXD
2
3
B2
RXD
RXD
3
2
A2
GND
GND
7
5
A1
B(+)
DCD
8
1
B4
A(-)
DTR
20
4
B1
DCD
DSR
6
6
A4
CTS
CTS
5
8
A3
RTS
RTS
4
7