KT&C KVR-1601S - Manual (Page 167)

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12. TEXT-IN (POS)
12.1 Usage of Serial-In Function
 Enables a user may use Serial In connections to record/search/display text data from POS/Cash Register’s serial.
 A user can choose the data whether to record/display or both.
12.2 Connection Method
 Up to four ATM/POS channels are available could be connected.
 A DVR uses a USB port for Serial In to connect to a POS/Cash Register. Use correct USB to RS232 converters as follows.
- FTDI chipset included converter
- Prolific PL2303 / PL2303X / PL2303HX chipset included converter
- Winchiphead chipset included converter
 When using a converter, please connect USB slot of DVR first, then restart in order to the DVR recognizes the USB converter
as an RS-232 Serial In.
 When using a multi-converter, the port recognizes Serial In1 as its shortest line.
NOTE
A DVR can only recognize English alphanumeric characters.
The maximum extension length for RS-232 cable is 15 meters approximately with no signal loss.
12.3 Connection Diagram
 Users can connect RS-232 port to USB port at front/rear of DVR by using a converter.