Star Micronics SP300 Manuale Utente
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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.
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.
of 20 mA loop current.
18
TTY RXDR
—
Indicates the ground side of the data signal
of 20 mA loop current.
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 20 mA loop current.
at 20 mA 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.)
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.)
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”.
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”.
printer is ready to receive data, this signal
changes to “SPACE”.