Remotely programmable equipment monitoring telephone line protocol
First Claim
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1. A method of communicating over a telephone line between a pair of data processing systems having modems, comprising:
- alternatively, either providing a seize mode manifestation indicative of the fact that the telephone line can be seized when busy for providing outgoing data messages or not providing said seize mode manifestation;
providing a start time signal indicative of the start of a time period in each day within which said telephone line may be accessed for data messages;
providing a stop time signal indicative of the time in each day when said time period stops;
providing data signals indicative of conditions in equipment associated with a first one of said data processing systems;
providing an alarm signal indicative of the fact that at least one condition indicated by said data signals relates to an emergency condition, the fact of which should be urgently transmitted over said telephone line; and
transmitting said data signals over said telephone line alternatively, either;
in the presence of said seize mode manifestation whether or not said telephone line is free;
in the absence of said seize manifestation at a time of day which is between said start time and said stop time whether or not said telephone line is free;
or in the absence of said seize mode manifestation when the time of day is not between said start time and said stop time, only in the event that said telephone line is free.
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Abstract
A master data processor (18) may send data indicative of equipment condition through a modem (24) to a modem (26) of a data processor (28) in a local monitoring center (over telephone lines) whenever they occur in response to a seize mode (59) or between established times of day (64, 68, 69), or whenever the telephone line becomes free (65)if the data messages amount to alarm conditions (65). Calls can be received at the local monitoring center 14 between said preestablished times (79-82) after a predetermined number of rings (83, 85).
19 Citations
7 Claims
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1. A method of communicating over a telephone line between a pair of data processing systems having modems, comprising:
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alternatively, either providing a seize mode manifestation indicative of the fact that the telephone line can be seized when busy for providing outgoing data messages or not providing said seize mode manifestation; providing a start time signal indicative of the start of a time period in each day within which said telephone line may be accessed for data messages; providing a stop time signal indicative of the time in each day when said time period stops; providing data signals indicative of conditions in equipment associated with a first one of said data processing systems; providing an alarm signal indicative of the fact that at least one condition indicated by said data signals relates to an emergency condition, the fact of which should be urgently transmitted over said telephone line; and transmitting said data signals over said telephone line alternatively, either;
in the presence of said seize mode manifestation whether or not said telephone line is free;
in the absence of said seize manifestation at a time of day which is between said start time and said stop time whether or not said telephone line is free;
or in the absence of said seize mode manifestation when the time of day is not between said start time and said stop time, only in the event that said telephone line is free. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification