CCR1036 & serial APC UPS

Hi,
I’ve been trying to figure this out for a few hours today.
I have an APC UPS that communicates well with RB1100AHx2, if I replace the routerboard with a CCR I can not get any communications with the UPS.
I have disabled the serial terminal, set specific serial baud rates etc, but just can not get this to work.

Anyone managed to get this working?

Ade