MODBUS USER INSTRUCTION For Sensorex Smart Sensors

PublishTime：2022-05-18

●Thank you for choosing Sensorex Smart Sensor products. This instruction manual is provided to guide the user in the use of the smart sensor products. It covers all aspects of programming and communication for the sensors. If any question not covered in this document arise, please contact your Sensorex supplier or support@sensorex.com
●Sensorex Smart Sensor Modbus User Instruction
■Modbus is a simple and robust standard communication protocol. Sensorex Smart Sensor is designed to function as a Modbus Slave on a multi-drop RS485 serial connection using the Modbus RTU (remote terminal unit) protocol. Please refer to Modbus Application Protocol Specification V1.1b3 (April 26, 2012) for more detailed about each protocol specification. The Remote Terminal Unit serial protocol is described in MODBUS over Serial Line, Specification and
Implementation Guide, V1.02.
■Each sensor has four wires: two for RS485 (white is A, green is B) and two for power (red is V+, Black is V-). When in the Modbus mode, a Modbus master devise can read and configure the sensor. Since RS-485 uses half-duplex communication, master switches to transmitting state to send a command then switches to receiver state and waits for a response. The waiting time for master to receive a response should be at least 200 milliseconds for the slave to process the command and send out the response.
■It is important to remember that all setup changes requires a power (on then off) cycle or soft reset to accept any changes.
■Sensorex Smart Sensors are capable of reading and writing in the 4-20mA loop current mode. Any changes to the 4-20mA scale require the Modbus communication interface.

Brand of Product：	Sensorex
Part#：
Product Category：	Smart Sensors More
Application：	More
Data Type：	User's Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	FEBRUARY 1, 2022
Version Number：	Rev. 1.2
Data Encoding：
Data Size：	1.9 MB

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