use Protocol::Modbus and ccs

[luca_l]

I need some suggestions to use Protocol::Modbus on pc as a master
and a pic programming with ccs for slave.
any kind of help is welcome.

thank you very much
Luca

P.S. googling I also found  Java Modbus Library too.
      but now this is planed for a future  project. 

[phu_thanh]

Hi luca_l

If you are familiar with Visual Basic 6. Then visit this website: http://www.modbus.pl/vb.htm
You can download the Modbus RTU Master project in VB6.
There also have a PIC modbus RTU slave project. However it is written and compiled with PICBASIC and HI_TECH C.

phuthanh

[baba]

Hi Luca
I already done a modbus slave using a PIC16f873 and using CSS.
The projects was a modbus IO, in order to received input logic signal and send out logic signal.

bye.
BABA
 

[bogdantk]

Hello Baba
Maybe you will post the project on the forum.
I think it will be interesting for a lot of people.
I look forward.

[Dembo]

Once I found this client/server package from FieldServer Technologies for MCC18. I havn't tried it yet, but looks useful for modbus.

http://rapidshare.de/files/38563892/modbuspw.zip.html

Also some info and utilities on their site:

http://www.fieldserver.com/techsupport/utility/utility.php

 

[titi]

Hi,

This is an implementation of Modbus Slave in MikroC with a P18F45K22.
From LibStock http://www.libstock.com/projects/view/355/modbus-slave

Download File: http://www.libstock.com/projects/download/355/0/355_modbus_slave_v1.0.0.2.zip

Best regards.

[centiane]

Hi, one question.
ModBus is same RS485?

In this case is posible comunication more than 100 meter.

Regards Moises.

[allegro]

Hi, one question.
ModBus is same RS485?

In this case is posible comunication more than 100 meter.

Regards Moises.

If I understood your question correctly.. The modbus protocol is used a lot over rs485 twisted pair communication. Modbus is not rs485. At the expense of lower baudrate you can communicate over a long distance (>100m).

[Ganymed]

RS485 is the physical layer (Layer 1).
Modbus is a protocol on data link layer (Layer 2).

Further informations you can find on http://www.modbus.org.
E.g. Modbus-Specification: http://www.modbus.org/docs/Modbus_over_serial_line_V1.pdf

[centiane]

Ok thank you.
I use RS485 for comunnication PLC and INVERTER (omron).

Regards Centiane.