
Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 53
RS-422/485 Interface
0605-033
Figure 33 RS-485 Module
Numbers refer to Figure 33 above:
1 = Flat cable pins
2 = Selection switches
3 = Screw terminals for wiring
NOTE
The markings on the module and in this manual are according to the line
driver manufacturers’ application notes, where A is posive against B
when measured with a voltmeter.
When connecting the module, be prepared to swap the A and B wires if
you have a communication problem.
Installation and Wiring
1. Disconnect the power. In case the RS-485-module is installed in
the factory, continue with the item 4.
2. To attach the module, open the transmitter cover and fasten the RS-
485 module to the bottom of the housing with four screws.
3. Connect the flat cable between the RS-485 module and the
motherboard's pins MODULE1 (Communications).
4. Pull the network wirings through the cable gland.
5. Connect the twisted pair wires (1 or 2 pairs) to the screw terminals
as presented in Table 6:
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