KT&C KVR-1601S - Manual (Page 168)

168
NOTE
 After cables connected and Serial In (DVR menu) values changed, please restart the DVR so that the DVR recognizes
attached Serial In connections.
 Use RS232 null modem cable between POS/Cash Register and USB to RS232 converter. RS232 cross-over connector is
useful when a user needs to switch the Rx/Tx connections.