Internal wiring - WXT530

By default, the 8-pin M12 connector is wired for:

• RS-232
• RS-485
• SDI-12
• RS-422
• mA output

Table 1. RS-232 wiring

Internal wiring				External wiring
Pin #	Internal connector pin	Internal connector pin function for RS-232	Internal wiring for RS-232	M12 pin	External wiring for RS-232
1	VIN+	Vin+ (operating)	Brown	2	Brown
2	VIN-	Vin- (operating GND)	Red	8	Red
3	RX-
4	RX+
5	TX-	Data out (TxD)	Blue	7	Blue
6	TX+		Gray	5	Gray
7	RXD	Data in (RxD)	White	1	White
8	SGND	Communication ground (GND)	Green	3	Green
9	HTG+	Vh+ (heating)	Yellow	4	Yellow
10	HTG-	Vh- (heating)	Pink	6	Pink
					Shield

Table 2. RS-485 wiring

Internal wiring				External wiring
Pin #	Internal connector pin	Internal connector pin function for RS-485	Internal wiring for RS-485	M12 pin	External wiring for RS-485
1	VIN+	Vin + (Operating)	Brown	2	Brown
2	VIN-	Vin- (Operating GND)	Red	8	Red
3	RX-	Data-	Loop with Blue
4	RX+	Data+	Loop with Gray
5	TX-	Data-	Blue	7	Blue
6	TX+	Data+	Gray	5	Gray
7	RXD		White	1	White
8	SGND	Communication ground (GND)	Green	3	Green
9	HTG+	Vh+ (Heating)	Yellow	4	Yellow
10	HTG-	Vh- (Heating)	Pink	6	Pink
					Shield

Table 3. SDI-12 wiring

Internal wiring				External wiring
Pin #	Internal connector pin	Internal connector pin function for SDI-12	Internal wiring for SDI-12	M12 pin	External wiring for SDI-12
1	VIN+	Vin+ (Operating)	Brown	2	Brown
2	VIN-	Vin- (Operating GND)	Red	8	Red
3	RX-
4	RX+
5	TX-	Data in/out (Tx)	Blue	7	Blue
6	TX+		Gray	5	Gray
7	RXD	Data in/out (Rx)	White	1	White
8	SGND	Communication ground (GND)	Green	3	Green
9	HTG+	Vh+ (Heating)	Yellow	4	Yellow
10	HTG-	Vh- (Heating)	Pink	6	Pink
					Shield

Table 4. RS-422 wiring

Internal wiring				External wiring
Pin #	Internal connector pin	Internal connector pin function for RS-422	Internal wiring for RS-422	M12 pin	External wiring for RS-422
1	VIN+	Vin+ (Operating)	Brown	2	Brown
2	VIN-	Vin- (Operating GND)	Red	8	Red
3	RX-	Data in (RX-)	Blue	7	Blue
4	RX+	Data in (RX+)	Gray	5	Gray
5	TX-	Data out (TX-)	White	1	White
6	TX+	Data out (TX+)	Green	3	Green
7	RXD
8	SGND
9	HTG+	V+ (Heating)	Yellow	4	Yellow
10	HTG-	Vh- (Heating)	Pink	6	Pink
					Shield

Table 5. mA output wiring

Internal wiring				External wiring
Pin #	Internal connector pin	Internal connector pin function for mA output	Internal wiring for mA output	M12 pin	External wiring for mA output
1	VIN+	Vin+ (operating)	Brown	2	Brown
2	VIN-	Vin- (operating GND)	Red	8	Red
NC	NC
NC	NC
Iout1	Iout1	Iout1	Blue	7	Blue
GND	GND	GND	Gray	5	Gray
Iout2	Iout2	Iout2	White	1	White
GND	GND	GND	Green	3	Green
9	HTG+	Vh+ (heating)	Yellow	4	Yellow
10	HTG-	Vh- (heating)	Pink	6	Pink
					Shield