Intermec EASYCODER 7421 User Manual Page 73
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About Communications
The 7421 printer supports both serial and parallel
communications. Using the parallel interface with an IEEE 1284
parallel interface cable (Part No. 590124) provides the best
performance.
Your printer has the following hardware and software
requirements:
• The host computer must use the American Standard Code for
Information Exchange (ASCII) for data communications.
• A serial port or a parallel port must be available on the host if
you are connecting directly to the printer.
• The host must support the RS-232 or data communications
interface.
For information on configuring the host computer, port
concentrator, or network controller, see the reference manual for
the controlling device.
Serial Communication Protocols
Communication protocols are important because they determine
the transmission standards for communications between the
printer and the host. The printer and the host must use the same
protocol and parameters to communicate properly. The printer
supports the flow control and block transfer protocols described
in the next sections. All of these protocols are point-to-point.
Application programs and/or ROM BIOS determine which
protocols your computer can support. For more detailed
information, refer to the Intermec Data Communications Reference
Manual (Part No. 044737).
Intermec Printer Standard Protocol
Intermec Printer Standard Protocol is a half-duplex protocol. All
data transmission to the printer consists of status enquiry (ENQ),
status dump (VT), or message blocks. Each message block starts
with the Start of Text (STX) characters and ends with the End of
Text (ETX) characters. Each message block must be 255
characters or less, including the STX and ETX characters.
- EasyCoder 1
- Contents 3
- Maintaining the Printer 4
- Troubleshooting 4
- Printer Specifications 4
- Communications Reference 5
- Character Sets 5
- Before You Begin 7
- Warnings, Cautions, and Notes 8
- About This Manual 9
- Other Intermec Manuals 10
- Operating the Printer 11
- Getting to Know Your Printer 13
- Back View 14
- Understanding the Power Light 15
- Using the Feed/Pause Button 16
- Using the Peel-Off Option 17
- 7421U.005 18
- 7421U.003 18
- 7421U.006 19
- 7421U.011 20
- <3.9" 20
- 7421U.013 21
- 7421U.014 22
- 7421U.015 22
- 7421U.016 23
- Peel-off 23
- 7421U.017 24
- 7421U.018 25
- Label taken 25
- Loading Fanfold Media 26
- 7421U.020 27
- 7421U.023 28
- 7421U.027 30
- Configuring the Printer 31
- Co de 39 33
- Maintenance Schedule 47
- 7421U.033 48
- Cleaning the Printhead 50
- 7421U.035 51
- Printhead 51
- Drive roller 53
- Cleaning the Label Sensors 54
- Troubleshooting Checklist 59
- Printer Operation Problems 60
- Print Quality Problems 61
- Communication Problems 62
- Preventing Data Loss 63
- Fonts and Graphics 68
- Media Specifications 68
- Printing Method 68
- Printer Options 69
- About Communications 73
- XON/XOFF Protocol 75
- Hardware Protocol 76
- User-Defined Protocol 76
- RS-232 Serial Interface 78
- Pin Name Operation 79
- 7421U.040 80
- International Character Sets 83
- 86XX Character Table 84
- Code Page 850 Character Table 86
- Extended Character Sets 87
- 7421U.047 88
- Characters in Font c23 OCR A 89
- 7421U.049 90
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