Method and apparatus for automatically recognizing a modem type

Details Method and apparatus for automatically recognizing a modem type Method and apparatus for automatically recognizing a modem type

1996-11-12

1999-07-20

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

364900, 395500, H04B 138

Patent

active

059265060

ABSTRACT:
In a method and terminal apparatus for automatic modem type recognition and adaptation thereto within a communication mode, a microprocessor in a control unit of the terminal apparatus, is programmed to enter into a communication mode with a remote central data station in order to enter into a modem preselect value setting mode. The control unit is programmed so that the communication mode is exited after an automatic setup of the communication and after the execution of the communication. For automatic modem type recognition, modem-specific transmission sequences are stored in a program memory or in a modem initialization memory contained in a non-volatile memory of the terminal apparatus and are transmitted successively to the associated modem in steps, and the modem transmits its modem-specific response (transmission sequence) back to the microprocessor. The microprocessor then executes, in steps, a comparison of the response signals with the stored response signals for automatic modem type recognition. The recognized modem type is stored in non-volatile fashion in a modem detect memory. The microprocessor is programmed to execute a step to skip the recognition procedure if corresponding information about the modem type has been stored in the modem detect memory. The terminal apparatus may be a postage meter machine.

REFERENCES:
patent: 3255439 (1966-06-01), Simjian
patent: 4539689 (1985-09-01), Chiu et al.
patent: 5329634 (1994-07-01), Thompson
patent: 5732212 (1998-03-01), Perholtz et al.
"Method For Dynamically Determining Which Modem Is Installed," IBM Technical Disclosure Bulletin, vol. 29, No. 7, Dec. 1986.

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