Patent ID: 8762612
Filing Date: 2014-06-24
Classification: H04L

Abstract:
1. A communication slave used in a communication network system in which a master and a plurality of communication slaves are coupled through a high-potential side bus and a low-potential side bus in a daisy-chain manner, the communication slave comprising: a control device that controls communication with the master; a capacitive element coupled between the high-potential side bus and the low-potential side bus, the capacitive element holding power that is supplied through the high-potential side bus and the low-potential side bus and that is used for operating the communication slave; a voltage determining portion that determines whether a voltage between the high-potential side bus and the low-potential side bus exceeds a threshold voltage; and a time measuring portion that measures a time from when a charge of the capacitive element through the high-potential side bus and the low-potential side bus is started to when the voltage determining portion determines that the voltage exceeds the threshold voltage, wherein the control device sets an ID value for communicating with the master based on a length of the time measured by the time measuring portion.