In this instructable, we will learn to build and program a
RS485 communication network between a x86 PC and a microcontroller board .
The USB to RS485 Converterand the MSP430 Booster Pack for RS485 Communication are
available online for purchase from our online store.
On the PC side we are using a USB to RS485 converter to convert the USB signal to RS485 compatible signal.The PC side software is written in CSharp (C#) and is targeted to run on both Linux and Windows operating systems.
On the Microcontroller side
you can use any microcontroller with a built in UART like 8051,PIC ,MSP430 or LPC2148.The UART should be interfaced with a MAX485 RS485 decoder chip.The connection diagram is available here
Here we are using MSP430 Launchpad (MSP430G2553) as the microcontroller .
Step 1: Required Materials
For this Instructables you will require the following things
2) Microcontroller (MSP430,8051,PIC or LPC2148)
3) MAX485 chip (RS485 Decoder )
6) Terminal Block Connectors
(optional ,If you don't want to build the MAX485 interfacing Circuit and you are planning on using MSP430 Launchpad as the Microcontroller Platform)
The USB to RS485 Converter and the MSP430 Booster Pack for RS485 Communication are available online for purchase from our online store.
Step 2: Windows Software for RS485 Communication
The PC side code is written in C# and runs on the Dot Net Framework on Windows Operating System.
The code can be compiled using Visual Studio Express Edition or Sharpdevelop.
All the Codes are available on GitHub.
Step 3: Linux Software for RS485 Communication
The same code can be used to run on the Linux Platform.
On Linux Platform the code runs on the opensource Mono framework instead of Dot Net Framework.
The code can be compiled using mcs compiler.