Recommended Serial Cable Connections for Citizen CLP labels printers:

9-pin D-type on PC to 25-pin D-type on Printer
PC 9-way D-Type			Printer 25-way D-Type
n/a	no connection or shell		1	FGND Frame Ground
3	TXD Transmit Data		3	RXD Receive Data
2	RXD Receive Data		2	TXD Transmit Data
8	CTS Clear to Send		20	Busy
5	SGND Signal Ground		7	SGND Signal Ground
6	DSR Data Set Ready		4	RTS Ready to Send
4	DTR Data Terminal Ready		5	CTS Clear to Send

25-pin D-type on PC to 25-pin D-type on Printer
PC 25-way D-Type			Printer 25-way D-Type
1	FGND Frame Ground		1	FGND Frame Ground
2	TXD Transmit Data		3	RXD Receive Data
3	RXD Receive Data		2	TXD Transmit Data
5	CTS Clear to Send		20	Busy
7	SGND Signal Ground		7	SGND Signal Ground
6	DSR Data Set Ready		4	RTS Ready to Send
20	DTR Data Terminal Ready		5	CTS Clear to Send