
Chapter 3 ________________________________________________________________ Installation
VAISALA________________________________________________________________________ 51
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Figure 33 4-Wire RS-485 Bus Connections, Part B
Table 8 2-Wire (Switch 3:Off)
RS-485 master Data DMT346
A ↔ A
B ↔ B
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.
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