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Signal
pin RS-232C
Current
loop Direction Description
17 — TTY-TXD OUT Transmits data. This pin
transmits serial data from
the printer to the
computer.
20 DTR — OUT Data terminal ready. This
pin indicates whether or
not the printer is ready to
receive data. If the printer
ready protocol is not
selected, the printer is
always ready to receive
data (this pin is always
HIGH). If the printer ready
protocol is selected, the
printer can accept data
when the pin level is HIGH
and cannot accept data
when the pin level is LOW.
When the DTR signal goes
LOW, the host computer
must stop sending data
within 256 characters. This
function can be set on or
off with the default-setting
mode of the printer.
23 — TTY-RXD
Return
— Received data. This pin
transmits serial data from
the computer to the
printer.
24 — TTY-RXD
Return
— Transmits data. This pin
transmits serial data from
the printer to the
computer.
25 — TTY-RXD IN Received data. This pin
transmits serial data from
the computer to the
printer.
Specifications
A-9