Rs-422/rs-485 interface module (rs485-1) – Vaisala PTB330 User Manual
Page 44
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USER'S GUIDE____________________________________________________________________
42 __________________________________________________________________ M210855EN-D
WARNING
The relay module may contain dangerous voltages even if the
barometer power has been disconnected. Before opening the
barometer you must switch off both the barometer and the voltage
connected to the relay terminals.
WARNING
Do not connect the mains power to the relay unit.
RS-422/RS-485 Interface Module
(RS485-1)
1102-023
Figure 25
RS485-1 Module
Numbers refer to Figure 25 above:
1
=
Flat cable pins
2 = Selection
switches
3
=
Screw terminals for wiring
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