Interface Specifications
Signal
Pin
20
RS-232C
DTR
RS-422
Direction
OUT
Description
Data terminal ready. This pin indicates
whether or not the printer is ready to
receive data. If the printer ready protocol
is not selected, this pin is always HIGH
(i.e. the printer is ready to receive data).
If 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 128
characters. Can be set HIGH or LOW
with SelecType.
• Although RTS, CTS, DSR, DTR, and DCD are designated as RS-232C signals,
they can also be used when RS-422 is selected with SelecType.
Technical Specifications
8-15
