7167 Owner’s Manual
Chapter 5: Communication
November
2002
74
XON/XOFF Protocol
The XON/XOFF characters coordinate the information transfer between the printer and
the host computer. The printer sends an XON character when it is ready to receive data
and it sends an XOFF character when it cannot accept any more data. The software on the
host computer must monitor the communication link as shown in the following flowchart
in order to send data at the appropriate times.
If XON/XOFF has been selected, the printer also toggles the DTR signal, as described in
the next section, but it does not look at the DSR signal to transmit data.
XON character = Hex 11.
XOFF character = Hex 13.
DTR/DSR Protocol
The DTR signal is used to control data transmission to the printer. It is driven low when
the printer is ready to recieve data and driven high when it cannot accept any more data.
Data is transmitted from the printer after it confirms that the DSR signal is low.
RS-232C Technical Specifications
This section describes the pin settings for the connectors and the RS-232C interface
parameters. The RS-232C parameters are selectable in the Diagnostic mode. See
“Diagnostics: Communications Interface Settings” in chapter 4 for the position of the DIP
switches. The RS-232C parameters must match those of the host.
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