Printronix L5520 User Manual download pdf (Page 215)

Performance Considerations

215

Performance Considerations

The printer prints letter size and A4 size fanfold paper at 15 pages

per minute portrait (one page every 4.0 seconds) and 20 pages per

minute landscape. To sustain printing at full speed, data for each

page must be received and rendered in less than 4.0 seconds for

portrait mode (otherwise the printer pauses).

Failure to print at full speed can be caused by one or more of the

following:

• an inefficient application program

• an insufficient communication interface bandwidth

• a slow host computer

• a low priority on the host printer port or printing task

• a highly complex print job, usually containing a large number of

characters and graphics that exceeds the bandwidth of the

controller

An inefficient application program is listed first, because a highly

efficient program sends fewer characters to the printer than a less

effective program, and it can be used to overcome the other four

causes of performance problems. This is especially true of

IGP/VGL and IGP/PGL applications, due to the power of these

printer emulations. In many cases, converting a program from IGP/

VGL to IGP/PGL results in substantial performance improvements.

Wide width printing jobs with a large number of characters on a

page can exceed the communication bandwidth and/or the

communication speed of the host computer. A plain text print job of

132 columns by 66 lines requires a sustained data transmission

rate of 3485 characters per second, or, for serial communication, a

sustained throughput of 34.85 KBaud (assuming 8 bits of data, 1

stop bit, 1 start bit, and no parity bit).

1 2 ... 210 211 212 213 214 215 216 217 218 219 220 ... 243 244

No comments

Printronix L5520 User Manual Page 215