Chapter 5: Communication Interface | A794 Owner’s Guide |
The next table shows that with no delay between lines, the transmit time is much less than the process time, allowing the printer to print at full speed.
No Delay Between Lines
Char. per | Lines per | Transmit Time | Transmit Time | Transmit Time | Process Time |
Line | Receipt | (9600 Baud) | (19.2 K Baud) | (115.2 K Baud) | in Seconds |
|
| in Seconds | in Seconds | in Seconds |
|
20 | 20 | 0.40 | 0.20 | 0.035 | 0.50 |
20 | 40 | 0.80 | 0.40 | 0.070 | 1.00 |
44 | 20 | 0.88 | 0.44 | 0.075 | 0.50 |
44 | 40 | 1.76 | 0.88 | 0.150 | 1.00 |
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.
44 | December 1999 |
