APC Back UPS ES 600

Back UPS 600 is a 600VA UPS manufactured by APC. I've been doing some little repairs on tweaks on it so i'll be sharing info on it here. It's based on a PIC18F45J50 microcontroller. Board model: 640-1134-Z REV04

Full Picture

ICSP pinout

Pinout for the ICSP header (J25)

RJ50 Pinout

Pinout for RJ50 data port

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Images from APC Back-UPS RS1000, Back-UPS ES 600 does not use this USB circuit, it uses USB straight from the MCU, and it's not confirmed that BACK-UPS ES 600 also has the opamps, but it likely does so it can isolate the port from the internal circuits, the RJ50 (J15) pinout is the same