EtherPath User’s Guide
72
RS-232 PIN Assignments
The EtherPath RS-232 port wiring is identical to a standard PC 9
pin DE-9P COM: port. It operates as a DTE device. The chart
below details signal directions and names.
Serial Port Pin Assignments
Pin
Signal Name
Type
1
Carrier Detect (CD)
In
2
Receive (Rx)
In
3
Transmit (Tx)
Out
4
Data Terminal Ready
Out
5
Signal Ground (GND)
Power
6
Data Set Ready (DSR)
(Hardware controlled-
connection input. See Section
5)
In
7
Request to Send (RTS)
Out
8
Clear to Send (CTS)
In
9
Ring Indicator (RI)
(Not used)
In