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发明公开
CN104218560A 一种电能表RS485通讯保护电路 无效 - 驳回

一种电能表RS485通讯保护电路
摘要：
本发明公开了一种电能表RS485通讯保护电路，该保护电路在RS485通讯接口的A信号上串接第一热敏电阻ZR1，在B信号上串接第二热敏电阻ZR2，在RS485通讯接口的A、B信号之间还连接有TVS瞬态抑制二极管D1。基于本发明的RS485通讯测试电路可以有效的保护通讯测试设备的安全，降低了设备的损坏，提高了设备可靠性。本发明可以广泛应用在电能表检定装置或电能表现场校验仪上。
摘要（英）：

The invention discloses an RS485 communication protection circuit of an electric energy meter. A first thermistor ZR1 is serially connected on A signals of an RS485 communication connector, a second thermistor ZR2 is serially connected on B signals, and a TVS (transient voltage suppressor) diode D1 is connected between the A signals and the B signals of the RS485 communication connector. An RS485 communication test circuit based on the RS485 communication protection circuit is capable of effectively protecting communication test equipment, damage of the equipment is reduced, and equipment reliability is improved. The RS485 communication protection circuit can be widely applied to an electric energy calibrator or electric energy meter on-site calibrator.

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