| 摘要 |
The present invention is concerned with a communication module for Intelligent Electronic Devices (IEDs) implementing the EIA-485 standard, and featuring an intelligent hardware support that allows a conventional software-based collision detection function to detect collisions independently of the location of the message sources on the transmission line. The hardware support enables both a "strong signal driving" mode as well as a "weak signal driving" mode. In the weak mode, a biasing, or attenuating, or voltage-dividing, resistor is temporarily inserted between a transmitter, or voltage source, and the transmission line. |
