Chapter 5 _______________________________________________ Wiring and Power Management
VAISALA_______________________________________________________________________ 59
The signal names Data in (RxD) and Data out (TxD) in the table
describe the direction of data flow as seen from the transmitter.
Table 5 Screw Terminal Pin-outs
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)
NOTE
Ground the external wiring shield. The shield is not connected inside
WXT.
NOTE
In true SDI-12, Data in (Rx) and Data out (Tx) lines must be combined.
NOTE
Short circuit loops are required between terminals 3 & 5, and
4 & 6 for RS-485. See Figure 32 on page 64.
To Next Page
Loading...
Need help?
General
