Honeywell HZC-855PX, HZC-855NX operation manual RDTxD TDRxD, TRxD+

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