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7193 Owner's Guide
The next table shows that with no delay between lines, the transmit time is much less than
the print time, allowing the printer to print at full speed.
Characters/Line
20
20
44
44
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.
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.
Lines/Receipt
20
40
20
40
XON character = hexadecimal 11.
XOFF character = hexadecimal 13.
Transmit Time:
Transmit Time: (19.2
(9600 Baud)
K Baud)
0.4 Seconds
0.2 Seconds
0.8 Seconds
0.4 Seconds
0.88 Seconds
0.44 Seconds
1.76 Seconds
0.88 Seconds
August 1998
Chapter 5: Communication
Print Time
1.2 Seconds
2.4 Seconds
1.2 Seconds
2.4 Seconds
35
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