Inovance IT6000 - Page 11

3 Wiring
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3.2.2 Connection to External Device (DB9 Female)
The COM1 and COM3 communication ports are available in the DB9 female. The
pin arrangement of DB9 female is described in the following table.
Pin No.
Signal
Pin Arrangement of
DB9 Female
COM1[RS485]
2-wire
COM1[RS485]
4-wire
COM3[RS485]
1 RS485-
RX- (receiving
negative)
COM1 [RS485 2/4W]
COM3 [RS485]
12345
6789
DB9 female
(Pinhole-type signal plate)
2 RS485+
RX+ (receiving
positive)
3
TX- (sending
negative)
4
TX+ (sending
positive)
5 GND (signal ground)
6 RS485-
7
8
9 RS485+
Note
The COM1 [RS485] 4-wire port means COM1 [RS422] port.