Appendix A. Networking
A.1 Connecting Several Transmitters on
Same Bus
There are two options for connecting several transmitters on the same bus:
• Using SDI-
12 serial interface and communication protocol
• Using RS-485 serial interface and one of the communication protocols: ASCII or NMEA
0183 v3.0.
A.2 SDI-12 Serial Interface
A.2.1 Wiring SDI-12
1. Perform SDI-12 wiring in the transmitter as described in 5
. W
iring and Power
Management (page 53). Make sure you combine the two "Data in/out" wires of each
transmitter either in the internal screw terminal inside or outside the transmitter.
2. In the data logger end, combine the "GND for data" wires of each transmitter to the
logger "GND for data" wire. Connect the "Data in/out" wires of each transmitter to the
logger "Data" wire.
A.2.2 SDI-12 Communication Protocol
Set the communication protocol SDI-12 v 1.3 (aXU,C=1,M=S) or SDI- 12 v1.3 continuous
(aXU,C=1,M=R).
Assign the transmitters on the bus with dierent addresses (for
ex
ample:aXU,A=0,1,2,...). After that, the transmitters on the bus do not respond to the
commands not assigned to them nor to the data messages sent by the other transmitters.
Example (A bus with three WXT530 Series transmitters):
WXT530 #1 communication settings:
0XXU,A=0,M=S,C=1,B=1200,D=7,P=E,S=1, L=25
WXT530 #2 communication settings:
1XXU,A=1,M=S,C=1,B=1200,D=7,P=E,S=1, L=25
WX
T530 #3 communication settings:
Appendix A – Networking
171
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