If a RS485-3 connection (not physically present in the unit) is necessary and the MPXT firmware version is minimum 1_q, there is the possibility to use RS485-2 as RS485-3.
To enable the RS485-3 line, access the MPXT’s OSD, browse to THERMAL CAMERA menu, and set the CONTROL option to EXTERNAL. At the end connect to RS485-2, it will be used like RS485-3.
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