Android Question ModBus TCP

[Alessandro548]

How can i communicate by Modbus TCP with my Plc on Android device?

I already make a programm with Visual Basic 6 that communicate (read and write) with my Plc by Modbus TCP protocol.

But now i want upgrade and using Android device (smartphone or tablet)

 

[Erel]

You should use Socket (Network library) + AsyncStreams (RandomAccessFile library):

https://www.b4x.com/android/forum/pages/results/?query=asyncstreams

 

[Alessandro548]

You should use Socket (Network library) + AsyncStreams (RandomAccessFile library):

https://www.b4x.com/android/forum/pages/results/?query=asyncstreams

thanks for your reply....but this example not use protocol Modbus TCP

on my PLC i have only Modbus TCP...is an international standard industrial protocol

 

[KMatle]

Modbus TCP

Did you install that protocoll on you windows machine (Network) as an extra protocoll? Otherwise it's just a TCP/IP socket connection. It's more about the data you send. But you should know that as you have a working VB program.

 

[Alessandro548]

Did you install that protocoll on you windows machine (Network) as an extra protocoll? Otherwise it's just a TCP/IP socket connection. It's more about the data you send. But you should know that as you have a working VB program.

I am not an expert in network communication.
you say that i must create a simple TCP/IP socket connection on B4A?

If yes....can you send me some example? thanks

 

[KMatle]

Follow Erel's example (see his post). The modbus device is listenling via TCP/IP to a special port. So try to connect to this port with the example code and send some data.

 

[Alessandro548]

Follow Erel's example (see his post). The modbus device is listenling via TCP/IP to a special port. So try to connect to this port with the example code and send some data.

The Plc respond only with correct format of data send by TCP/IP Modbus send from PC (example read command)

 

[Erel]

You will need to implement the protocol yourself. I'm not familiar with Modbus so I cannot say whether it will be simple or not.

ByteConverter and RandomAccessFile are two useful objects for such tasks.

 

[KMatle]

I already make a programm with Visual Basic 6 that communicate (read and write) with my Plc by Modbus TCP protocol.

You already did a working program. So what did you do exactly? Which commands are you sending? B4x is similar.

 

[Didier9]

How can i communicate by Modbus TCP with my Plc on Android device?

I already make a program with Visual Basic 6 that communicate (read and write) with my Plc by Modbus TCP protocol.

But now i want upgrade and using Android device (smartphone or tablet)

A few years ago, I implemented the ModBus protocol on PC under VB 6.0 and in C on an ARM microcontroller. From what I remember, you could reuse a lot of your VB6.0 code to make a B4A implementation using the AsyncStreams library. The most painstaking part is parsing and creating the messages, and that code will be largely the same.

 

[Alessandro548]

You already did a working program. So what did you do exactly? Which commands are you sending? B4x is similar.

I need a "object" for network communication (and simple example), like Socket in VB6...but this time in B4A

 

[Erel]

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