Star Micronics 347F user manual MA current loop option, RS-422A option

20 mA current loop (option)

Pin no.	Signal name	I/O	Function
		direction
9	TTY TXDR	—	Indicates the ground side of the data
			signal of 20 mA loop current.
10	TTY TXD	OUT	Transmitted data of 20 mA current
			loop.
17	TTY TXDR	—	Indicates the ground side of the data
			signal of 20 mA loop current.
18	TTY RXDR	—	Indicates the ground side of the data
			signal of 20 mA loop current.
19	TTY RXD	IN	Received data of 20 mA current loop.
23	TTY RXDR	—	Indicates the ground side of the data
			signal at 20mA loop current.
24	TTY TXD	OUT	Transmission data of 20 mA current
			loop.
25	TTY RXD	IN	Reception data of 20 mA current loop.

RS-422A (option)

	Pin no.	Signal name	I/O	Function
APPENDIX			direction
	9	SD (+)	OUT	Transmitted data
	10	SD (–)	OUT	Transmitted data
	17	RD (+)	IN	Received data
	18	RD (–)	IN	Received data
	19	CS (+)	IN	When the host computer is set to standby
				for data transmission, this signal
				changes to “SPACE”.
				(In this instance, the printer does not
				check the signal.)
	23	CS (–)	IN	When the host computer is set to standby
				for data transmission, this signal
				changes to “SPACE”.
				(In this instance, the printer does not
				check the signal.)
	24	RS (+)	OUT	Data transmission request signal. When
				the printer is ready to receive data, this
				signal changes to “SPACE”.
	25	RS (–)	OUT	Data transmission request signal. When
				the printer is ready to receive data, this
				signal changes to “SPACE”.

– 50 –