Vaisala HMT330 Manuel d'utilisateur Page 63

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Vue de la page 62
Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 61
1102-027
Figure 38 2-Wire RS-485 Bus
Table 8 2-Wire (Switch 3: Off)
RS-485 master
Data
HMT330
D1+
D1+
D0-
D0-
8. When operating in communication mode RS-422, set both switches
3 and 4 to ON position (4-wire wiring is required for RS-422
mode).
9. Connect the power and close the cover.
Termination
Termination
Junction
box
Junction
box
Junction
box
120R
D0-
D1+
Common
Switch
Term off
Term off
2/4 wire off
RS422 off
Stub
Stub
Stub
RS485-1
RS485-1
RS485 bus master
Twisted pair Common line
Address NN
Address MM
Common
D0-
D1+
Switch
Term off
Term off
2/4 wire off
RS422 off
Common
D0-
D1+
120R
Twisted pair Common line
Vue de la page 62
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