Honeywell HZC-855PX - Manual (Page 9)

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4.3. Remote Control using for RS-422/485 connection ( Connector pin 9,10,11,12 ) -------- OPTION
Connect to Serial PORT
(COM1 or COM2)
14P Cable
Serial Cable
10
11
12
RD(TxD)
TD(RxD)
GND
14P Cable
Serial Cable
( 9 Pin D-Sub )
2 RD
3 TD
5 SG
485 Converter
9
10
11
R +
R-
T+
14P Cable RS-485 Converter
T+
T-
R+
12 T- R-
422
9
10
11
R +
R-
T+
14P Cable RS-485 Converter
TRxD+
TRxD-
12 T-
485