RS232 communication protocol Mitsubishi FX3G PLC

c# vb6 serial-port plc
Hrqls picture Hrqls · Dec 10, 2012 · Viewed 13.3k times · Source

Does anyone know the communication protocol for communication with the RS232 port of a Mitsubishi FX3G PLC?

I searched the site of Mitsubishi and Googled, but couldn't find the syntax of the commands to send to obtain the data of specific registers in the PLC.

I found the following parts of the command though:

  • BR = bit read
  • BW = bit write
  • WR = word read
  • WW = word write

I could not find though wether i should use a straight cable, or a crossed cable, and not even at which baudrate i should communicate (or other settings like data bits, stop bits, and parity)

Does anyone have any experience with RS232 communication with a FX3G PLC ?

  • what is the baudrate (and other communication settings) ?
  • how is the header of the command built up ?
  • how is the command itself built up ?
  • how is the checksum calculated ?

(It doesn't matter in which coding language or just a protocol manual)

Answer

jac picture jac · Dec 11, 2012

See if this manual doesn't help you, http://www.automationsystemsandcontrols.net.au/PDF%27s%20Mitsubishi/Manuals/FPLC/FX%20SERIES%20USER%27S%20MANUAL%20-%20Data%20Communication%20Edition.pdf. A list of manuals is also available at http://www.automationsystemsandcontrols.net.au/Technical%20Mitsubishi.html.

Related questions

SerialPort Vs MSComm

Is it possible that .Net SerialPort and VB6 MSComm work different? In both cases, I´m reading data from the buffer, and both got me different strings, if I import the MSComm dll into my .Net project, It works perfectly (…

Read More
A Simple C# DLL - how do I call it from Excel, Access, VBA, VB6?

I have a simple class library written in c#. using System; namespace TestDll { public class Test { public string HelloWorld { get { return "Hello World"; } } } } My question is how can I call this HelloWorld function from Microsoft Office Visual Basic (which I …

Read More
Is there any VB6 to C# migration tool?

Does anyone know a way to convert from VB6 code to C#? Is there a tool that can do this for me? Is there any migration process that I can follow to do this?

Read More