Panasonic VF2H Series Construction Manual page 23

EXTERNAL IR CONNECTION
First monitor
External IR Receiver
In case of the Digital Link daisy chain connection of the VF1H/VF2H/VF2 model,
no need to connect the IR daisy chain cable (stereo mini plug).
But, connection limitation is same as the Digital Link daisy chain connection.
Daisy Chain Connection 6
Max：100 units （VF1H/VF2H/VF2 model）
Second monitor
Max： 62 units （LFV8/LFV9 model）
Third or more monitor
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