Location:Home - Blogs
What is Modbus and How does it work in the Industry


In this blog post, we will discuss what Modbus communication protocol is and the types of Modbus used in the industry.


What is a protocol?

First, let’s know what a protocol is. The protocol is the language used for communication technology, just like the language of our daily conversation. For example, we make an agreement called protocols, “1” is left, “2” is right, and I will give you a “1”. If you don’t learn this protocol, you only know that it is “1”, and if you have learned that, you will know that it means left.

What is Modbus protocol?

After comprehending the concept of “protocol”, let’s look at what Modbus protocol is. Modbus is a serial communication protocol, and it is a bus protocol published by Modicon Company (now owned by Schneider Electric) in 1979 for communication with its programmable logic controller (PLC).

Several versions of the Modbus protocol exist for the serial port and Ethernet and the most common are Modbus TCP, Modbus RTU, Modbus ASCII and Modbus Plus.

Modbus ASCII protocol

Modbus ASCII protocol is based on Modbus RTU protocol, which converts instructions into ASCII characters for transmission. For example, Modbus RTU protocol needs to transmit “12”, which only needs one byte. Modbus ASCII protocol needs to convert “1” to “31” and “2” to “32”, and then it takes two bytes to transmit. Therefore, Modbus ASCII is inefficient and has a low utilization rate.

Modbus Plus protocol

Modbus Plus protocol, commonly known as MB+, is a high-speed Fieldbus network, a typical token bus network and a local area network system, especially for industrial control applications.

Modbus TCP protocol

Modbus TCP protocol is used to manage and control automation equipment. It covers the use of Modbus messages in “Intranet” and “Internet” environments using TCP/IP protocol. You can see it as Modbus RTU protocol running on Ethernet.

Modbus RTU protocol

Modbus protocol is a protocol running between devices, or we should say there must be Modbus RTU protocol between devices! This is stipulated in Modbus protocol, and the default mode must be RTU protocol. Frame structure generally consists of address, function code, data and check.

Why is Modbus protocol all the rage?

Up to this point, it doesn’t seem to see why the Modbus protocol can be so popular. Let’s find out together.

Modbus has become the industry standard of communication protocol in the industrial field (De facto), and now it is a common connection mode (an industrial standard) between industrial electronic devices. In addition, there are the three primary keys to its success:

  • Publicly published and without copyright requirements.

  • Easy to deploy and maintain.

  • There are not many restrictions on changing local bits or bytes.

Generally speaking, Modbus is a protocol for industrial control, which has three characteristics: free use, easy to use and easy to change, and has been widely used. 

Because of the above characteristics, Modbus protocol has stood the test of time and is still being used in a wide range of fields, such as instruments and meters, intelligent high and low voltage electrical appliances, transmitters, programmable controllers, man-machine interfaces, frequency converters, field intelligent equipment and so on.

How is the Modbus used in the industry?

There comes the new-generation IoT edge gateway designed for industrial IoT. With pre-integrated industrial protocols such as Modbus TCP/RTU and IoT clouds like MS Azure and AWS, the IoT edge gateway makes it easy to collect data from different onsite devices, validate data and upload them to the cloud — and the configuration takes only a few minutes without any programming.

The gateway can play the role of a Modbus Master and reads registers from a Modbus Slave device. The signals can be on both the RS485 link and also the Ethernet link.

IoT Products
Edge Routers
IoT Edge Gateway
Industrial Cellular Router
Serial-to-Cellular Modem
IoT Software & Service
IoT Solutions
Branch Networking
Smart Grid
Industrial Automation
About Us
Company Profile
Contact Us
Newsletter Signup
Customer Service
Legal Notice
Privacy Policy
Warranty Policy
+1 (703) 348-2988
inhand networks, inhandnetworks, lte, 4g, 4g-lte, 3g, umts, dsl, ethernet, cellular, gprs, wireless, wired, wi-fi, vpn, m2m-vpn, openvpn, ipsec-vpn, secure, reliable, dual-sim, 2-sim, redundant, rugged, din-rail, din-rail-mounting, ul-certified, fcc-certified, ptcrb-certified, verizon-wireless-certified-, at&t-certified, ce-certified-, emark-certified, azure-iot-certified, cost-effective-, ipv6, python-programming, reliability, security, high-speed, lte-cat-1, router, gateway, routers, cellular-gateway, modem, hardware, software, cloud-platform, applications, ethernet-switch, managed-switch, vehicle-router, car-router, dtu, data-terminal-unit, computer, vending-computer, vending-pc, manufacturer-, manufacturing, android-computer, iot, industrial-iot, industrial-internet-of-things, m2m, industrial-m2m, m2m-communication, remote-communication, wireless-m2m, remote-connectivity, remote-access, m2m-connectivity, iiot, industrial-networking, industrial-wireless, m2m-iot, smart-vending-, touchscreen-vending, cloud-vms, telemeter, vending-telemetry, cashless-vending, light-industrial-, commercial-, distribution-automation, distribution-power-line-monitoring, fault-location, fault-detection, da-monitoring, smart-grid, transformer-monitoring, intelligent-substation, goose-messaging-, remote-machine-monitoring-, remote-secure-networks, remote-secure-networking, secure-web-based-scada--, remote-diagnostics, remote-maintenance-, plc-programming, intelligent-traffic-enforcement, ct-scanners-remote-monitoring, mri-remote-monitoring, healthcare-, wireless-atm, branch-networking-, retail-, digital-signage, wastewater-treatment, remote-monitoring, industrial-automation, automation, industrial-transport, inhand, inhand network, inhand networks, Industrial IoT, IIoT, Industrial IoT Manufacturer, Industrial IoT Connectivity, Industrial IoT Products, Industrial IoT Solutions, Industrial IoT Products, industrial IoT Gateway, industrial IoT router, M2M IoT gateway, M2M IoT router, industrial router, Industrial IoT Router/Gateway, industrial IoT Gateway, industrial LTE router, Industrial VPN router, Dual SIM M2M router, Entry-level Industrial Router, Cost-effective, 3G/4G LTE, Wi-Fi, VPN industrial router for commercial and industrial and M2M/IoT applications., Industrial 3G Router, Industrial 3g router, UMTS router, VPN routerIndustrial 3g router, UMTS router, VPN router, DIN-Rail router, cellular router, Industrial IoT Gateway, Industrial IoT Gateway, M2M gateway, VPN gateway, remote PLC programming, Industrial Cellular Modem, Cellular modem, data terminal unit, 3g modem, Industrial 3G Cellular Modem, 3g modem, industrial cellular modem3g modem, industrial cellular modem, industrial wireless modem, data terminal unit, Android Industrial Computer, Android Industrial Computer, Vending PC, Vending Telemetry, Vending Telemeter, Android Industrial Computer, Android Industrial Computer, Vending PC, Vending Telemetry, Vending Telemeter, Touchscreen & Vending PC, Vending Touchscreen, Vending Telemeter, Vending Telemetry, Vending Computer, Industrial LTE Router, industrial IoT Gateway, industrial LTE router, Industrial VPN router, Dual SIM M2M router, Industrial IoT Router/Gateway, industrial IoT Gateway, industrial LTE router, Industrial VPN router, Dual SIM M2M router, Industrial LTE Router, Industrial LTE router, industrial 4G/3G router, router industrial, cost-effective industrial LTE router, Industrial LTE Router, Industrial LTE router, industrial IoT router, router industrial, cost-effective M2M router, M2M LTE router, Industrial 3G Router , Industrial 3g router, industrial wireless router, VPN router, DIN-Rail router, cellular router, Industrial 3G Router , Industrial 3g router, industrial wireless router, VPN router, DIN-Rail router, cellular router, Distribution Power Line Monitoring System, Overhead Line Monitoring, Distribution Power Line Monitoring, Fault detection & location, Grid Analytics System, Remote Machine Monitoring & Maintenance System, IoT Remote Monitoring, Prognostics and Health Management, Remote connectivity, Remote Maintenance, Smart Vending, smart vending, InHandGo, retrofit, touchscreen vending, cashless vending, cloud VMS, Transformer Monitoring, Transformer Monitoring, substation monitoring, grid LTE router, wireless communication, smart grid, Remote Automation, Remote Automation, Secure remote networks, web SCADA, Remote Diagnostics, Remote PLC programming, Intelligent Traffic Enforcement, Intelligent Traffic Enforcement, wireless networking, cellular router, Wireless ATM Solution, Wireless ATM, ATM Remote Diagnostic