Panasonic KX-TG6572C Service Manual page 51

12.2.2. Connections (Handset)
Connect the DC Power or Battery to BATT+ and BATT-.
Connect the JIG cable GND (black) to GND.
Connect the JIG cable UTX (yellow) to UTX and URX (red) to URX.
Note:
*: COM port names may vary depending on what your PC calls it.
KX-TG6572C/KX-TG6572R/KX-TGA653C/KX-TGA653R
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