产品概述 Product Overview

GDC2 系列微机保护装置采用CAN BUS 和RS485 现场总线作为对外通讯接口，现场总线具有通讯连接简单可靠、通讯速度快(CAN 可达1Mbps、RS485 可达19200bps)、通讯距离远(CAN 可达10km)、通讯可靠性高、抗干扰强等优点。

CAN BUS 和RS485 现场总线的通讯介质为屏蔽双绞线，设备互相连接时采用手拉手方式，通讯线不能交叉分支，起始节点和终端节点应接入120 欧姆匹配电阻，以减少终端匹配反射。

The GDC2 series microcomputer protection device adopts CAN BUS and RS485 fieldbus as external communication interfaces. Fieldbus has the advantages of simple and reliable communication connection, fast communication speed (CAN can reach 1Mbps, RS485 can reach 19200bps), long communication distance (CAN can reach up to 10km), high communication reliability, and strong anti-interference.

The communication media of CAN BUS and RS485 fieldbus are shielded twisted pair cables. When devices are connected to each other, they are connected hand in hand, and the communication lines cannot cross branch. The starting and ending nodes should be connected with 120 ohm matching resistors to reduce terminal matching reflections.