We will now look at the do more plc modbus ascii protocol communication. This will be done through PLC ladder logic sending ASCII characters out the serial port.
More information can be obtained on our website. This includes all of the links mentioned in this video.
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Modbus is a communication method used for transmitting information over serial lines between electronic devices. The device requesting the information is called the Modbus Master (Client) and the devices supplying information are Modbus Slaves (Servers). This protocol was originally developed by Modicon systems.
Modbus protocol comes in basically three different types. Ethernet (Modbus TCP) or Serial (Modbus RTU or Modbus ASCII). Modbus TCP and Modbus RTU come as standard protocols in the BRX Do-More series of PLCs.
We will connect the BRX Do-More PLC to a Solo process temperature controller. This will be done using the Modbus ASCII protocol over serial RS485 communication wire. (Media) The present and set values (PV / SV) will be read from the Solo controller and the set value will be written when required. Let's get started.

The entire BRX Series PLC can be found at the following location:
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Here are some of the individual posts with video links:
Installing the Software
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Establishing Communication
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Numbering Systems and Addressing
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First Program
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Online Editing and Debug Mode
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Timers
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Serial Communication – Modbus RTU to Solo Process Temperature Controller
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Data Logging
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Email – Text SMS Messaging Gmail
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Secure Email Communication
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AdvancedHMI Communication – Modbus TCP
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PID with PWM Output
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PID Ramp Soak Profile
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BRX Do-More Simulator MQTT Publish-Subscribe
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BRX Do-More PLC MQTT Communications
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BRX Do-More PLC to Stride Field IO Modbus TCP
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BRX Do-More PLC Ethernet Remote IO Controller BX-DMIO
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Modbus RTU TCP Remote IO Controller BX-MBIO
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BRX Do-More PLC to Modbus TCP RTU Remote IO Controller BX-MBIO
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There are several reasons why we are using the BRX Series Controller. Here are just a few.
- Standalone PLC with built-in I/O
- Built-in Data Logging
- Communication ability - Ethernet Port, RS232, RS485, USB - support for protocols such as Modbus RTU, Modbus TCP, ASCII, K-sequence (DirectLOGIC users), Custom Protocols (ASCII over serial, TCP or UDP over Ethernet)
- Built-in Analog input and output
- Integrated motion control
- High-speed counters
- Powerful instruction set (Video of Instructions in software)
- Ability to expand the system with a variety of modules
- Part of the Do-More series of PLCs which use the same free software. (Do-More Designer)
- Integrated simulator in the software capable of external communications for testing

The BRX series of programmable logic controllers consist of four different units. They differ depending on the Inputs and Outputs built into the unit and if it has the ethernet port.
No I/O Micro PLC unit – (BX ME)
10 Point Micro PLC unit – (BX 10/10E)
18 Point Micro PLC unit - (BX 18/18E)
36 Point Micro PLC unit - (BX 36/36E)
These CPUs (Central Processing Units) are also known as MPU (Multi-Processing Units) because of the communication capabilities.

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