CITIZEN CT-S281 - Manual (Page 17)

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Printer
Pin Signal
2 TXD
3 RXD
4 RTS
6 DSR
7 SG
20 DTR
3.2 Connecting Interface Cables
Turn off the printer and unplug the power connector. Then follow the procedure
for interface cable connection.
Orient the interface cable terminal correctly and insert it into the interface
connector.
CAUTION!
● When disconnecting the cable, always hold the connector.
● Lay the cable not to be caught by the leg or the like.
Serial Interface
For serial interface cable, use the one with the following connection.
9-pin - 25-pin cable
PC
Signal Pin
RXD 2
TXD 3
DTR 4
SG 5
DSR 6
CTS 8
USB Interface
USB cable clamp