Star Micronics SP317 Installation Manual page 33

20 mA current loop (option)
Pin no. Signal name
9 TTY TXDR
10 TTY TXD
17 TTY TXDR
18 TTY RXDR
19 TTY RXD
23 TTY RXDR
24 TTY TXD
25 TTY RXD
RS-422A (option)
Pin no. Signal name
9 SD (+)
10 SD (–)
17 RD (+)
18 RD (–)
19 CS (+)
23 CS (–)
24 RS (+)
25 RS (–)
I/O
direction
— Indicates the ground side of the data
signal of 20 mA loop current.
OUT Transmitted data of 20 mA current
loop.
— Indicates the ground side of the data
signal of 20 mA loop current.
— Indicates the ground side of the data
signal of 20 mA loop current.
IN Received data of 20 mA current loop.
— Indicates the ground side of the data
signal at 20mA loop current.
OUT Transmission data of 20 mA current
loop.
IN Reception data of 20 mA current loop.
I/O
direction
OUT Transmitted data
OUT Transmitted data
IN Received data
IN Received data
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.)
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.)
OUT Data transmission request signal. When
the printer is ready to receive data, this
signal changes to "SPACE".
OUT Data transmission request signal. When
the printer is ready to receive data, this
signal changes to "SPACE".
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Function
Function