The 8-pin M12 connector is located on the
bottom of the transmitter.
Figure 1. Pins of 8-pin M12
connector
The following table shows the pin
connections for the 8-pin M12 connector and the wire colors of the respective M12 cable
(optional, 2 or 10 m).
Table 1. Pinouts for WXT530 series serial interfaces and power
supplies
| Wire color |
M12 pin # |
RS-232 1 |
SDI-12 1 |
RS-485 1 |
RS-422 1 |
mA output 2 |
| White |
1 |
Data in (RxD) |
Data in/out (Rx) |
- |
Data out (TX-) |
Iout2 |
| Brown |
2 |
Vin+ (operating) |
Vin+ (operating) |
Vin+ (operating) |
Vin+ (operating) |
Vin+ (operating) |
| Green |
3 |
GND for data |
GND for data |
GND for data |
Data out (TX+) |
GND Iout2 |
| Yellow |
4 |
Vh+ (heating) |
Vh+ (heating) |
Vh+ (heating) |
Vh+ (heating) |
Vh+ (heating) |
| Gray |
5 |
- |
- |
Data+ |
Data in (RX+) |
GND Iout1 |
| Pink |
6 |
Vh- (heating) |
Vh- (heating) |
Vh- (heating) |
Vh- (heating) |
Vh- (heating) |
| Blue |
7 |
Data out (TxD) |
Data in/out (Tx) |
Data- |
Data in (RX-) |
Iout1 |
| Red |
8 |
Vin- (operating) |
Vin- (operating) |
Vin- (operating) |
Vin- (operating) |
Vin- (operating) |
Table 2. Screw terminal pinouts
| Screw terminal |
RS-232 |
SDI-12 |
RS-485 |
RS-422 |
| 10 HTG- |
Vh- (heating) |
Vh- (heating) |
Vh- (heating) |
Vh- (heating) |
| 9 HTG+ |
Vh+ (heating) |
Vh+ (heating) |
Vh+ (heating) |
Vh+ (heating) |
| 8 SGND |
GND for data |
GND for data |
GND for data |
GND for data |
| 7 RXD |
Data in (RxD) |
Data in (Rx) |
- |
- |
| 6 TX+ |
- |
- |
Data+ |
Data out (TX-) |
| 5 TX- |
Data out (TxD) |
Data out (Tx) |
Data - |
Data out (TX+) |
| 4 RX+ |
- |
- |
- |
Data in (Rx+) |
| 3 RX- |
- |
- |
- |
Data in (Rx-) |
| 2 VIN- |
Vin- (operating) |
Vin- (operating) |
Vin- (operating) |
Vin- (operating) |
| 1 VIN+ |
Vin+ (operating) |
Vin+ (operating) |
Vin+ (operating) |
Vin+ (operating) |
The signal names Data in (RxD) and Data
out (TxD) in the table describe the direction of data flow as seen from the
transmitter.
| Ground the external wiring
shield. The shield is not connected inside WXT530. |
| In true SDI-12, Data in
(Rx) and Data out (Tx) lines must be combined. |
| Short circuit loops are
required between terminals 3 & 5, and 4 & 6 for RS-485. See Internal wiring. |
| Do not use operating power
supply ground (VIN-) for communication ground (RS-232, RS-485, SDI-12, RS-422). Use SGND
communication ground (GND). |
Table 3. WXT532 mA output option screw
terminal pinouts
| Screw terminal |
mA output |
| 10 HTG- |
Vh- (heating) |
| 9 HTG+ |
Vh+ (heating) |
| 8 GND2 |
GND Iout2 |
| 7 Iout2 |
Iout2 (direction) |
| 6 GND1 |
GND Iout1 |
| 5 Iout1 |
Iout1 (wind) |
| 4 NC |
- |
| 3 NC |
- |
| 2 VIN- |
Vin- (operating) |
| 1 VIN+ |
Vin+ (operating) |