Remotely programmable equipment monitoring telephone line protocol
US5450478A · kind A · utility
4Cited by
11References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1994 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Jul 8, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.