To set up the MMF Multiple Cash drawers set the DIP switches as follows.
Cash Drawer 1 SWA 100000000
Cash Drawer 2 SWA 010000000
Then turn on use cashier drawers in workstation setup and set your employee to use either drawer 1 or 2 in assign employee codes.
These settings are for the MMF ECD-232ND,ECD-432ND & ECD-532ND, I am not sure if yours is one of these, if not here is how to set it up
5 Data Bits
1 Stop Bit
Drawer# ASCII CODE