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RS-485 Description
Modbus Over RS-485
Operation Guide
RS-485 isa standard which describes a physical layer utilized in serial communication. RS-48 allows for
installation of inexpensive local network systems and supports multi-drop communication links. Due to its
use of differential balanced line signaling oer twisted pair wring, RS-485 can span distances of up to 4,000
feet (1,220 meters) without repeaters. RS-485 has been widely adopted in many industries as the underlying
physical layer of industrial automation networks.
JP2
K1
K2
K3
CTM-530
LINEAR
HEAT
DETECTOR
POWER
ALARM
FAULT
SHORT
APPROVED
FM
OKESC
JP2
PROTECTOWIRE CTI-155
NORMAL
11:38am 12/21/2016
Modbus Description
Modbus is a communication protocol originally developed and published by Modicon in 1979. It is now a
de facto - standard protocol utilized in a wide array of communication applications. The standard is openly
published and a royalty-free protocol.
CTM-530 Modbus over RS-485 Description
The CTM-530 interface module provides integrated Modbus over RS-485 communications. Each module
can be confi gured as a Modbus slave device on an RS-485 network. Once confi gured to communicate on a
network, each module can be polled by a master device for a variety of module specifi c data. A master device,
such as a PLC (Programmable Logic Controller) can monitor the status of one or more modules and take
actions based on their status. Modbus over RS-485 communication is a convenient method for utilizing
detector stats information to implement equipment shutdown or other automation events.
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