20 ma current loop (option), Rs-422a (option) – Star Micronics SP312F User Manual
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APPENDIX
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
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”.