Vaisala HUMICAP MMT330 Guide de l'utilisateur Page 59

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Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 57
1102-023
Figure 33 RS-422/485 Module
The following numbers refer to Figure 33:
1
=
Flat cable pins
2
=
Selection switches
3
=
Screw terminals for wiring
NOTE
The data lines on earlier versions of the RS
-422/485 module are marked
A an
d B instead of D1+ and D0-. When the line is idle, D1+ has positive
voltage compared to D0
-.
When connecting the module, be prepared to swap the D1+ and D0
-
wires if you have a communication problem.
Installation and Wiring
1. Disconnect the power. In case the RS-422/485 module is installed
in the factory, continue with the item 4.
2. To attach the module, open the transmitter cover and fasten the RS-
422/485 module to the bottom of the housing with four screws.
3. Connect the flat cable between the RS-422/485 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 on page 58:
1
2
3
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