All Coaxitron PTZ control was lost using a CM9700 Series Matrix system.


After performing equipment rack maintenance the CM9760-KBD Keyboard Operators could no longer PTZ any of their cameras.

Product Line

Pelco Matrix


  • CM9700-CC1 (CPU Controller any version)
  • Multiple CM9760-KBD Intelligent Keyboards any version.
  • CM9760-CXTA Coaxitron Translator


The reversed RS422 data cable from the CM9760-CXTA’s in port to the CM9700-CC1 sercom port was damaged and no longer transporting the data.

Note: When losing control of multiple cameras at once, search for a global solution to the root cause.


Repair or replace the RS422 data cable. The data cable pin out would be reversed (1-8, 2-7, 7-2, 8-1).
For instructions with illustration, see page 7 of the CM9760-CXTA Installation/Operation Manual