B–9RS-232 Communication Interface
Publication
1747-6.2
DCE Pinout
Devices such as a modem are DCE. The pinouts on these terminals
are wired to interface with DTE.
DCE 9 pinout Signal is
Equivalent
DCE 25
pinout
1 –DCD Data Carrier Detect Output 8
2 –RXD Received Data Output 3
3 –TXD Transmitted Data Input 2
4 –DTR Data Terminal Ready Input 20
5 –COM Common Return (Signal Ground) Shared 7
6 –DSR Data Set Ready Output 6
7 –RTS Request to Send Input 4
8 –CTS Clear to Send Output 5
9 –RI Ring Indicator Output 22
Important: DCE signal names are viewed from a DTE perspective.
For example, TXD is a DTE output and also a DCE
input.
AB PLCs
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