6-4
Chapter 6: Communication Interface
If the application sends data at 9600 baud and pauses between lines for
as short a time as 50 milliseconds, the printer will never be able to print
at full speed. However, if the application sends data at 19.2 K baud and
does not pause between lines, the printer will be able to print at its full
speed of 2400 lines/minute. The table below shows that with a pause
of 50 milliseconds after each line, the transmit time equals or exceeds
the printer process time, slowing down the printer, regardless of the
baud rate.
50ms Pause after Each Line
Characters/Line Lines/Receipt
Transmit
Time
(19.2 K Baud)
Process Time*
20
20
1.2 Seconds
0.5 Seconds
20
40
2.4 Seconds
1.0 Seconds
44 20 1.44
Seconds
0.5
Seconds
44 40 2.88
Seconds
1.0
Seconds
* Process Time is the time it would take the printer to process the data
if all transmitted data was present. (It is not the time it takes to print
the receipt.)
Example: 20 characters/line, with 20 lines = 0.5 seconds process time
for the printer. It takes 1.2 seconds to send the data to the printer at
19.2K-baud speed with a 50ms delay after each line. Thus the printer
would have to wait 0.7 seconds longer to receive the data than it could
process it if no delays existed and the transmission speed were faster.
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.
Summary of Contents for 7158
Page 1: ...NCR 7158 Thermal Receipt and Impact Printer Release 1 0 Owner s Guide B005 0000 1112 Issue D...
Page 26: ...1 8 Chapter 1 About the Printer...
Page 50: ...3 12 Chapter 3 Using the Printer Clearing Check Flip Paper Jams Check Check Flip Window Door...
Page 110: ...5 28 Chapter 5 Technical Specifications Code Page 437...
Page 111: ...Chapter 5 Technical Specifications 5 29 Code Page 850...
Page 112: ...5 30 Chapter 5 Technical Specifications Code Page 852...
Page 113: ...Chapter 5 Technical Specifications 5 31 Code Page 858...
Page 114: ...5 32 Chapter 5 Technical Specifications Code Page 860...
Page 115: ...Chapter 5 Technical Specifications 5 33 Code Page 863...
Page 116: ...5 34 Chapter 5 Technical Specifications Code Page 865...
Page 117: ...Chapter 5 Technical Specifications 5 35 Code Page 866...
Page 128: ...6 10 Chapter 6 Communication Interface...
Page 286: ...7 158 Chapter 7 Programming Guide...
Page 314: ...Index 8 W Weight of printer 5 36 X XON XOFF protocol 6 6...