公开(公告)号：US09678919B2

公开(公告)日：2017-06-13

申请号：US14477369

申请日：2014-09-04

Applicant: ABB Technology AG

Inventor： Cornelius Heckrott ,  Henrik Pind

IPC: G06F13/42 ,  G06F13/40 ,  H04L25/02

CPC classification number: G06F13/4286 ,  G06F13/4072 ,  H04L25/028

Abstract: A communication module is disclosed for Intelligent Electronic Devices (IEDs) which can implement the EIA-485 standard, including an intelligent hardware support that can allow a known software-based collision detection function to detect collisions independently of the location of the message sources on the transmission line. The hardware support can enable 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 can be temporarily inserted between a transmitter, or voltage source, and the transmission line.