macmann Posted September 21, 2014 Share Posted September 21, 2014 I have had a vista 21ip installed in my system with the CBM module for more than a year. For some reason, the c4 system stopped communicating with the VISTA 21ip. I verified wiring from end to end. I swapped serial ports on the HC800. I get a rapid flashing light on the CBM module. I tried reconnecting via display, unplugging and replugging alarm panel, etc.. Same issue. No communications between the two. Any idea what could have happened? Link to comment Share on other sites More sharing options...
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