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Printer Setup 2-13
ETX/ACK (end-of-text/acknowledge)
For this busy-handling protocol, the host sends an ETX control
character at the end of each data transmission, and the printer
responds with an ACK control character to indicate that it is ready to
receive additional data. If the printer is busy when it receives the
ETX control character, it delays sending the ACK control character
until the busy condition is cleared. The default setting is OFF.
Connection
This feature provides selections for use when connecting the printer
directly to the host computer or indirectly via a modem. When you
connect the printer to a modem, set the connection parameter to
MODEM. When you connect the printer directly to the host computer
or a terminal, select DIRECT and set the busy-handling parameters
to conform to the requirements of the computer. The default setting
is DIRECT. The following paragraphs describe the direct connection,
ready/busy protocol.
DTR (Pin 20)
For this parameter you can choose either READY HIGH or ALWAYS
HIGH. For the READY HIGH setting, the printer sets interface pin
20 high to indicate that it is ready to receive data and low to indicate
that it is busy. For the ALWAYS HIGH setting, pin 20 is not used for
busy notification; one of the other busy-handling options must be
chosen. The default setting is READY HIGH.
PIN 11
For this parameter, you can choose either READY HIGH or READY
LOW. For the READY HIGH setting, the printer sets interface pin 11
high to indicate that it is ready to receive data and low to indicate
that it is busy. For the READY LOW setting the printer sets interface
pin 11 low to indicate that it is ready to receive data and high to
indicate that it is busy. The default setting is READY LOW.