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1.4 Wiring
1.4.1 Electrical grounding
Note the following grounding situation of the QBM97.
● QBM97 uses a non isolated RS485-Interface
● The reference of RS485 transceiver is connected to GND
● all GND pins are on the same potential
● if the Climatix controller and QBM97 are connected to the same power source,
take care to avoid miswiring between 24 V input and GND
The document "Modbus communication" (J3960) provides profound information
on Modbus grounding.
Transformer
Power
-
supply
24V
≂
0V
REF
B
-
A
+
Earth
Sensor module
Not isolated RS485
M
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