DT105R Cash Drawer Trigger is designed to provide RS-232 interfacing to the cash drawer . This allows the cash drawer , which is previously connected to POS printer or cash register , to be directly connected to a RS-232  port of the computer .
This means through the DT105 the cash drawer can be directly connected to the computer when there is no  printer used in the POS system .
DT105 is to open the cash drawer when it receives the trigger command or the RTS/DTR signal control from the computer .