User`s guide

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Flow Control The Flow Control menu item regulates the flow of data to the
printer for the serial connection. The following communication
protocols can be selected:
Xon/Xoff - This is a data stream handshake where the printer
sends an Xon (DC1; 11HEX) character to the host when the
printer is able to accept data, and sends an Xoff (DC3;
13HEX) when the printer cannot accept data. *Xon/Xoff is
the factory default.
The printer transmits an Xon when the print buffer is near
empty and when the printer completes its self test. The
printer transmits an Xoff when the print buffer is near full.
Robust Xon/Xoff - This data stream handshake is an
extension of the Xon/Xoff data stream handshake. If no data
is received within one second of the transmission of an Xon,
it sends additional Xon characters at one second intervals.
Data Terminal Ready (DTR) - The DTR line indicates
whether or not the printer can receive data (READY) or
(BUSY). When the printer is READY, the DTR signal
switches to a HIGH state (unless the DTR line is set to
inverted operation, in which case it switches to LOW) as
a request for data.
The printer requests data when the print buffer is near empty
and switches DTR to BUSY when the print buffer is near
full. When the printer is turned on, the DTR signal is held
at BUSY until the printer has completed Self-Test and
Warm Up.
Baud Rate The Baud Rate determines how fast information is sent from the
host computer to the printer and is measured in bits per second
(bps). The factory default setting is *9600 and is normally
appropriate, but the setting must correspond to the baud rate
setting of the host computer.
2-22 Using the Control Panel