User’s Guide ______________________________________________________________________
66 __________________________________________________________________ M211840EN-C
Table 12 Screw Terminal Pin-outs for Serial Interfaces and
Power Supplies
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)
NOTE
Use a shielded cable and ground the external wiring shield.
NOTE
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.
NOTE
If the transmitter was ordered 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 jumpers are
required between pins 3-5 and 4-6.
3 = RX- Data- Loop with Blue
4 = RX- Data- Blue
5 = RX+ Data+ Loop with Gray
6 = TX+ Data+ Gray
The transmitter has by default factory-installed loops in all serial
communication options except RS-422.
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