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2.3 J1 RS-232 Serial Communications Port
Connector type:
Purpose:
This connector is an RS-232 serial port which connects to a spare RS-232 PC COM (serial)
port. The pin-out of this connector is detailed in the table below. The 'RTS' pin must be
asserted by the PC COM port in order to enable the RS-485 line driver.
J1 Pin-out:
Pin No.
Title RS232
1
DCD
2
RXD
3
TXD
4
DTR
5
0 Volt
6
DSR
7
RTS
8
CTS
9
RING
Figure 7
4
9-Way Male D Connector (Female)
Connects to PC COM port (RS-232)
Description RS232
Not Connected
Receive
Transmit
Not Connected
0V
Not Connected
RS-485 Transmit ENABLE
The PC must assert this signal line in order to enable the RS-485 line
driver to allow communications from the PC to the remote RS-485
system.
Not Connected
Not Connected
RS232-RS485 Convertor Manual V1.02 28/06/01
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