Vaisala HMW90 Serie Guide Rapide page 11

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Connecting Several Transmitters
Set the RS-485 termination jumper to "ON" on the
transmitter that is at the end of the line. This terminates
the line with a 120 Ω resistor. For location of the jumper,
see section Transmitter Body on page 4.
Connect the cable shield to ground on the building
controller side.
Building controller
Power
+Vs
supply
-Vs
D+
RS-485:
BACnet or
D-
Modbus
master
GND
SHIELD
Connect shield on controller side
Transmitter Transmitter
+Vs
-Vs
D+
D-
GND
Shld
Transmitter
+Vs +Vs
-Vs -Vs
D+ D+
D- D-
GND GND
Shld Shld
Set RS-485
termination jumper
EN
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