Watchman's clock system

Details Watchman's clock system Watchman's clock system

G - Physics

07

C

G07C 1/20 (2006.01)

Patent

CA 2138378

A watchman's clock sys- tem comprises a time clock unit capable of interrogating and re- ceiving a coded response from a passive radio frequency respon- der (20), typically an identifica- tion coded radio frequency tag, located at a site to be visited. The time clock unit comprises a radio frequency transponder (30) and associated aerial (32) under the control of a micropro- cessor (34), which also controls the other functions of the time clock. Site identity coded in- formation incoming to the ra- dio frequency transceiver (30) from tag (20) is stored in mem- ory (38). A timer (36) generates timing information. The time clock is further provided with a visual display (40) and a power supply (42) and power manage- ment system (42). Stored in- formation representing a site or sites visited in the course of a duty may be transferred to an associated computer, local or remote, using dial tone multi- frequency (DTMF) signals produced by a tone generator (46) and a transducer (48). In the case of a remote computer the signals are transmitted by telephone line or radio link, a modem only being required at the receive end. The time clock may be provided with a complementary mount which receives it and a telephone handset. The mount may also incorporate a power supply for charging time clock battery (42).

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