| Screw terminal PIN | RS-232 | SDI-12 | RS-485 | RS-422 | mA output |
|---|---|---|---|---|---|
| 1 VIN+ | Vin+ (operating) | Vin+ (operating) | Vin+ (operating) | Vin+ (operating) | Vin+ (operating) |
| 2 VIN- | Vin- (operating GND) | Vin- (operating GND) | Vin- (operating GND) | Vin- operating GND) | Vin- (operating GND) |
| 3 RX- | Data- | Data in (RX-) | |||
| 4 RX+ | Data+ | Data in (RX+) | |||
| 5 TX- | Data out (TxD) | Data in/out (Tx) | Data- | Data out (TX-) | Iout1 |
| 6 TX+ | Data+ | Data out (TX+) | GND | ||
| 7 RXD | Data in (RxD) | Data in/out (Rx) | Iout2 | ||
| 8 SGND | Communication ground (GND) | Communication ground (GND) | Communication ground (GND) | GND | |
| 9 HTG+ | Vh+ (heating) | Vh+ (heating) | Vh+ (heating) | Vh+ (heating) | Vh+ (heating) |
| 10 HTG- | Vh- (heating) | Vh- (heating) | Vh- (heating) | Vh- (heating) | Vh- (heating) |
| Use a shielded cable and ground the external wiring shield. |
| For the SDI-12 mode, the Data in/out (Tx) and Data in/out (Rx) signals must be connected internally by looping pins 5 and 7, or, externally by looping the M12 pins 1 and 7. |
|
If you ordered the transmitter with any other serial communication than RS-422, the internal wiring has loops between pins 3 and 5, and between 4 and 6. For RS-422 operation, you must remove the loops. For the RS-485 communication mode, short-circuit loops are required between pins 3-5 and 4-6. 3 = RX Data-, Loop with Blue 4 = RX Data+, Loop with Gray 5 = TX Data-, Blue wire 6 = TX Data+, Gray wire The transmitter has by default factory-installed loops in all serial communication options except RS-422. For units with no data connector and other communication interface than RS-422, the loop wires are delivered in a plastic bag. |