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Table of Contents
5556 Modem Card ........................................................................................................................................................... 1
Copyright ...................................................................................................................................................................... 1
Trademarks ................................................................................................................................................................... 1
Notice to user ............................................................................................................................................................... 1
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FCC instructions ...................................................................................................................................................... 2
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Preface........................................................................................................................................................................ 2
Table of Contents ............................................................................................................................................................ 4
List of Figures .................................................................................................................................................................. 5
List of Tables .................................................................................................................................................................... 5
Overview....................................................................................................................................................................... 6
Introduction ............................................................................................................................................................. 6
Major features.......................................................................................................................................................... 6
Equipment ................................................................................................................................................................ 7
Installation .................................................................................................................................................................... 8
Interrupt request...................................................................................................................................................... 9
Base port address .................................................................................................................................................... 9
AT commands ............................................................................................................................................................ 11
Introduction ........................................................................................................................................................... 11
Operating modes ................................................................................................................................................... 11
Escape sequence ................................................................................................................................................... 12
Returning to online mode .................................................................................................................................... 12
AT commands ....................................................................................................................................................... 13
Result codes ........................................................................................................................................................... 17
S–Register .............................................................................................................................................................. 18
Troubleshooting......................................................................................................................................................... 19
Numbers instead of words display..................................................................................................................... 19
Type the AT command and do not receive an OK message ......................................................................... 19
The modem does not respond to your commands........................................................................................... 19
The command characters do not appear on the screen................................................................................... 19
Double letters appear on the screen when typing commands ....................................................................... 19
Technical specifications ........................................................................................................................................... 20
Other parameters ................................................................................................................................................... 21
Jumper configurations .............................................................................................................................................. 22
