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Home » Support » Fonrich Community » Fonrich Community » Combiner Box Monitoring » If the main controller(FR-DCMG-MMP?) has no communication or poor communication, how to solve it?

If the main controller(FR-DCMG-MMP?) has no communication or poor communication, how to solve it?

    First check the main controller baud rate, parity bit, address, etc., whether the settings are correct;

 

    Confirm whether the communication wire used is standard, 485 twisted pair shielded wire;

 

    Confirm whether there is a virtual connection between the communication line and the host "A, B" terminal and rail voltage terminal, etc.;

 

    Use a multimeter to measure whether there is an output voltage on the "A, B" terminals on the host module. The normal output voltage is between 3v-5v; Note: (When measuring, first remove the communication line and tighten the screws)

 

    If the output voltage of the "A, B" terminals is normal, it may be a communication line failure, or there may be a problem with the back-end system, and you should find the corresponding manufacturer for processing;

 

    If there is no output voltage at the "A, B" terminals, the module is broken.


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