Chapter 5 ____________________________________________________________ Technical Data
VAISALA______________________________________________________________________ 145
The dual RS-485 module also provides an SDI-12 connection. The SDI-
12 line uses one wire for data and is limited to a maximum length of 60
meters. Figure 68 on page 145 provides a schematic wiring diagram for
the SDI-12 connection and the 12 VDC power supply for a sensor. The
jumper settings should be as shown in Figure 66 on page 144.
Simultaneously with the SDI-12, you can connect channels A and B in
the 2-wire RS-485 mode. If you take all three channels in use, you either
need three free connectors in the flange or an optional junction box.
1006-103
Figure 68 Dual RS-485 Wiring Diagram for SDI-12 and
12 VDC Power Supply
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