Vaisala PTU300 Podręcznik Użytkownika Strona 51

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Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 49
WARNING
Do not connect the mains power to relay unit without grounding the
transmitter.
RS-422/485 Interface
0503-029
Figure 26 RS-485 Module
Numbers refer to Figure 26 above:
1 = Flat cable pins
2 = Selection switches
3 = Screw terminals for wiring
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 7 on page 50:
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