Specifications

Handshaking
The printer’s serial interface can use DTR (Data Terminal Ready) signal
levels and XON/XOFF communication protocols either separately or in
combination. When the vacant area for data in the input buffer drops to
256 bytes, the printer outputs an XOFF code or sets the DTR signal level to
low (MARK), indicating that the printer cannot receive more data.
Once the vacant area for data in the buffer recovers to 512 bytes, the
printer outputs an XON code or sets the DTR flag to high (SPACE),
indicating that the printer is again ready to receive data.
A * character is printed if a parity error, framing error, or overrun error is
detected.
Pin assignments
The serial interface connector pin assignments and a description of the
interface signals are shown in the table below. The direction of signals is
given relative to the printer.
Description
This line is connected to the
printer chassis.
Transmits data. This pin
transmits serial data from the
printer to the computer.
Receives data. This pin
transmits serial data from the
computer to the printer.
Request to send. This pin is held
high by the printer.
Always ignored.
I
Data set ready. This pin
indicates that the computer is
ready to receive data from
the printer. This signal can be
set high with SelecType.
Technical Specifications A-9