What does a Modbus do?

Modbus is typically used to transmit signals from instrumentation and control devices back to a main controller or data gathering system, for example a system that measures temperature and humidity and communicates the results to a computer.

What is Modbus and its types?

Modbus is an application-layer protocol, independent of the data transmission medium. Modbus data transactions only contain a function code, register addresses and data, and it is up to the master/client and the slave/server to make sense of the data. There are two types of serial Modbus, RTU and ASCII.

What is Modbus client?

Modbus is now a widely-accepted, open, public-domain protocol that requires a license, but does not require royalty payment to its owner. Modbus devices communicate using a master-slave (client-server) technique in which only one device (the master/client) can initiate transactions (called queries).

What is RTU protocol?

The Modbus RTU protocol is a means of communication that allows data exchange between programmable logic controllers (PLCs) and computers. Electronic devices can exchange information over serial lines using the Modbus protocol.

Where is Modbus used?

Modbus is used in multiple client-server applications to monitor and program devices; to communicate between intelligent devices and sensors and instruments; to monitor field devices using PCs and HMIs. Modbus is also an ideal protocol for RTU applications where wireless communication is required.

What type of cable is used for Modbus?

twisted pair cable
For MODBUS communications, a shielded and twisted pair cable is used. One example of such cable is Belden 3105A. But any cable with similar characteristics can be used to connect all the devices together.

What is WiFi RTU?

WiFi RTU is a type of industrial data logger. It collect device data via RS-232 and RS-485 interface, real-time monitor the device’s status and performance, collect and record data.