Modem for communication with enclosed electronic equipment

H - Electricity – 04 – L

Patent

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Details

H04L 5/14 (2006.01) G06F 13/40 (2006.01) H04B 10/00 (2006.01) H04B 10/10 (2006.01) H04M 11/06 (2006.01)

Patent

CA 2140261

A portable interface unit incorporates a modem for connecting a personal computer through a bidirectional communication link to enclosed process control equipment by passing radiation, preferably infra-red radiation, through a casing enclosing the unit. The computer has a bidirectional digital serial interface specified in accordance with an industry standard, and the modem has a complementary bidirectional digital serial interface, an optical modulator and an optical demodulator, and a power supply. The power supply can be a circuit to derive power from the serial interface of the personal computer, or from a battery. The portable interface unit provides a versatile bidirectional communications link which is particularly suitable for use in hazardous environment and with electronic equipment designed to be environmentally sealed or tamperproof, and permits general purpose computers to be used to program, diagnose, configure or interrogate such equipment.

Ensemble interface portable incorporant un modem servant à relier un ordinateur personnel par l'intermédiaire d'un lien de communication bidirectionnel à un équipement de commande de processus enfermé au moyen du passage d'un rayonnement, de préférence un rayonnement infrarouge, à travers un boîtier renfermant ledit ensemble. L'ordinateur possède une interface série numérique bidirectionnelle, conforme aux normes industrielles et le modem possède une interface série complémentaire, numérique et bidirectionnelle, un modulateur optique et un démodulateur optique, ainsi qu'une alimentation électrique. Celle-ci peut être sous forme d'un circuit servant à extraire du courant depuis l'interface série de l'ordinateur personnel ou d'une batterie. L'ensemble interface portable constitue un lien de communication polyvalent et bidirectionnel, particulièrement approprié à une utilisation dans un environnement dangereux et avec un équipement électronique conçu pour présenter une étanchéité au milieu ambiant ou une protection contre la fraude; ledit ensemble permet d'utiliser des ordinateurs universels pour programmer, diagnostiquer, agencer ou interroger ledit équipement.

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