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MODBUS or MODBUS TCP?

MODBUS is a data transmission protocol developed for industrial control applications. There are more than one protocol option in Modbus. Two of the most common of these protocols are the Modbus and Modbus-TCP/IP protocols. Although these two protocols are similar, cost and speed are the factors that make the difference between these two protocols.

Modbus is widely used, especially in the industrial production environment. It has a common link implemented by hundreds of vendors for integration into many different production devices to transfer discrete/analog input/output operations and record data between controllers. Modbus uses a master-slave architecture for which one device is responsible. The Modbus protocol uses formatted messages to communicate between the Master and Slaves. The messages are initiated by the system master and sent to a slave device. The slave then responds with the requested data or by reporting that it has performed the requested function. All messages from the master contain a two-byte (16 bit) CRC (cyclic redundancy check) checksum value for error checking. In the event of an invalid request being forwarded to a Modbus Slave device, a one-byte (8-bit) error code value is returned. For some reason, the request was erroneous.

Another protocol of Modbus is Modbus TCP. Ethernet TCP is the common transport protocol of the Internet and is actually a layered protocol set that provides a reliable data transport mechanism between machines. Ethernet has become the de facto standard for enterprise business systems, so it is not surprising that it has also become the de facto standard for factory networking. It is the protocol version of the Modbus protocol that has a TCP interface and runs on Ethernet. With Ethernet, you combine a versatile, scalable, worldwide physical network with TCP and Modbus, a universal network standard. Modbus is a simple command and control protocol adapted to a variety of environments, including TCP/IP, SMS and wireless transceivers.

The main difference between MODBUS and MODBUS TCP is that MODBUS TCP runs on an Ethernet physical layer and Modbus is a serial level protocol. You may encounter many problems with Modbus setup to ensure the RS485 network is working properly. Cable termination problems, network termination problems. On the other hand, you do not have to deal with configuration issues on Modbus TCP Ethernet devices.

These Modbus sensors measure temperature, humidity, air flow, water and their hybrid models. In addition to monitoring the environment, real-time three-phase voltage, current, frequency, power, active and reactive capacitive Fi tracking modules and GSM modules allow the user to call and send messages in case of alarm.

Contact us to find out which Modbus sensor is suitable for your Data Center and IT