Schäfer iQdata RMS 222 - Sensor Connection; Jumpers Must be Set as Follows

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User Manual
5.5. pir – vibr. – temp. probe
1. “CAN”
"CAN" - digital connector RJ12 for connection to the master module, CAN
sensors or CAN extensions
a CAN bus, with auto-sensing.
2. “TR”
Termination switch at the end of a CAN chain
3. LEDs:
"Green" - indicates "connected" status with the main module, "Red" -
indicates "not connected" status, "Orange" - indicates "alarm" status.
5.5.1. Sensor connection:
Jumpers must be set as follows:
a) For all sensors except the last sensor in the chain the jumpers on 1 and 2 . TR are ON.