To determine if your CCU docking station (otherwise known as a Control Mote or CM) is functioning correctly you will need a multimeter capable of reading AC and DC voltage. You will need to test 3 points:
1. Test input voltage. You input voltage should read 24VAC.
2. Test the charging output. You charging pins (pins 1 and 5) should read 5VDC. This charges the CCU battery.
3. Test the USB output. The USB pins (pins 6 and 8) should read 3.3VDC. This confirms the communication circuits are powered.
If these 3 values read as such your CM is working. If your tablet is not connecting then either the tablet has failed or there is more likely an alignment issue.
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