Vaisala WMS302 Betriebsanweisung PDF herunterladen (Seite 218)

User's Guide ______________________________________________________________________

216 __________________________________________________________________M210630EN-B

0201-050

Figure 158 DSI486 Wiring Diagram for RS-485 and RS-232

Figure 158 on page 216 provides a schematic wiring diagram for the

combination of the RS-485 and RS-232 connection. The correct jumper

settings for the channel B are listed in Table 39 on page 216.

The DSI486 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 159 on page 217 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 157 on page 215.

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.

Table 39 The Jumper Settings for Channel B in the RS-232

Mode

Jumper Connected

Pins

Function

X3 2-3 Sets the RS-232 mode active for the channel B.

X6 1-4

2-5

X5 None The line terminating resistor is not in use at all.

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Vaisala WMS302 Betriebsanweisung Seite 218