Is it possible to use both cash drawers at the same time?
Yes, you can connect a cash drawer to both connections at the
same time, although initially the cash drawers would normally have
different pin configurations. It is possible to use 2 cash drawers
with the same pin configuration at the same time if the jumpers on
the main PCB are set correctly.
However in this case the commands to activate the cash drawer need to have different parameters.