Method and apparatus for detecting an escape sequence in a modem

Details Method and apparatus for detecting an escape sequence in a modem Method and apparatus for detecting an escape sequence in a modem

1994-04-07

1996-06-25

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

H04B 138, H04L 516

Patent

active

055307183

ABSTRACT:
A method and apparatus for detecting an escape sequence to cause a modem to switch from a data transmission mode to a command mode. The escape sequence precedes a command instruction. The escape sequence comprises a first predetermined set of characters and a second predetermined set of characters. The method comprises the steps of temporarily storing in succession in a memory M characters received by the modem from a host computer; detecting whether the memory contains in contiguous manner the first and second sets of characters; leaving the modem in data transmission mode if the memory does not contain the contiguous occurrence of the first and second predetermined sets of characters; if the memory does contain the contiguous occurrence of the first and second predetermined sets of characters, detecting whether an end-of-instruction code is to be found in the N characters following the first and second contiguous predetermined sets of characters; leaving the modem in a transmission mode if the end-of-instruction code is not detected in said N characters; and if the end-of-instruction code is detected in said N characters, authorizing the modem to switch from data transmission mode to command mode.

REFERENCES:
patent: B14387440 (1986-04-01), Eaton
patent: 4387440 (1983-06-01), Eaton
patent: 4549302 (1985-10-01), Heatherington
patent: 4926448 (1990-05-01), Kraul et al.
patent: 5107518 (1992-04-01), Petty, Jr.
patent: 5295156 (1994-03-01), Heep et al.
patent: 5359648 (1994-10-01), Dunn et al.

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