Axiohm 7156 Especificações descarregar pdf (Página 177)

8.2.3 Receipt Throughput

Models 7156-3xxx are the original models. Models 7156-4xxx have higher receipt print

speed and were introduced in 1997.

Model 7156-3xxx Model 7156-4xxx

Dot line period

5.0 ms. maximum 3.0 ms. maximum

Paper speed

1.3 “/second

33 mm./second

2.25”/second

57 mm./second

Print line rate,

at 7.6 lpi standard pitch

600 lines/minute

10 lines/second

1020 lines/minute

17 lines/second

Note on models 7156-4xxx:

In order for an application to fully realize the faster print speed it must ensure that data to be

printed arrives at the printer at least as fast as it is printed. And it must allow receipt lines to

be buffered ahead at the printer, so the printer will be able to print each line immediately after

the preceding line, without stopping to wait for more data. Ideally, an application will send all

the data for an entire customer receipt without pausing between characters or lines

transmitted.

At 9600 baud data rate, it takes approximately 1 millisecond to transmit one character of

data; at 19.2 K baud it takes 500 microseconds. The application should maintain this rate for

all the data to be printed. It takes approximately 60 milliseconds for the printer to process the

data and print one line. If individual characters are sent at 9600 baud, but the application

pauses between lines for merely 50 milliseconds, the printer will never be able to print at full

speed.

Some timing examples, with an application delay of 50 milliseconds after each line, show that

for either baud rate the transmit time equals or exceeds the print time, forcing the printer to

pause between lines, waiting for data to print:

characters/line lines/receipt transmit time,

9600 baud

transmit time,

19.2 K baud

print time

20 20 1.4 sec 1.2 sec 1.2 sec

20 40 2.8 sec 2.4 sec 2.4 sec

44 20 1.88 sec 1.44 sec 1.2 sec

44 40 3.76 sec 2.88 sec 2.4 sec

The same examples, with no delay between lines transmitted, show that for either baud rate

the transmit time is much less than the print time, allowing the printer to print the lines at full

speed:

characters/line lines/receipt transmit time,

9600 baud

transmit time,

19.2 K baud

print time

20 20 0.4 sec 0.2 sec 1.2 sec

20 40 0.8 sec 0.4 sec 2.4 sec

44 20 0.88 sec 0.44 sec 1.2 sec

44 40 1.76 sec 0.88 sec 2.4 sec

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