7193 Owner’s Guide
Chapter 5: Communication
August 1998
35
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
Lines/Receipt
Transmit Time:
(9600 Baud)
Transmit Time: (19.2
K Baud)
Print Time
20
20
0.4 Seconds
0.2 Seconds
1.2 Seconds
20
40
0.8 Seconds
0.4 Seconds
2.4 Seconds
44
20
0.88 Seconds
0.44 Seconds
1.2 Seconds
44
40
1.76 Seconds
0.88 Seconds
2.4 Seconds
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 = hexadecimal 11.
XOFF character = hexadecimal 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.
Summary of Contents for 7193
Page 1: ...BD20 1439 A Issue B August 1998 NCR 7193 Thermal Receipt Printer Owner s Guide ...
Page 6: ...Contents 7193 Owner s Guide August 1998 x ...
Page 16: ...Chapter 2 Setting Up the Printer 7193 Owner s Guide August 1998 10 Parallel Models ...
Page 22: ...Chapter 2 Setting Up the Printer 7193 Owner s Guide August 1998 16 ...
Page 24: ...Chapter 2 Setting Up the Printer 7193 Owner s Guide August 1998 18 ...
Page 26: ...Chapter 2 Setting Up the Printer 7193 Owner s Guide August 1998 20 ...
Page 30: ...Chapter 3 Solving Problems 7193 Owner s Guide August 1998 24 ...
Page 48: ...Chapter 5 Communication 7193 Owner s Guide August 1998 42 ...
Page 88: ...Chapter 6 Commands 7193 Owner s Guide August 1998 82 ...
Page 96: ...Appendix B Print Characteristics 7193 Owner s Guide August 1998 88 ...
Page 102: ...Index 7193 Owner s Guide August 1998 94 ...
Page 103: ......