How to implement Modbus protocol on hardware side?

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Thread Starter

Hemant

Can anybody help me to implement Modbus protocol in New Project? I am using 16f877 and Max232 IC. plz tell me the h/w requirement to implement it. my project is pH meter. It measures the ph Value. Currently i am using Ascii protocol to send pH Value to PC. But now i need to calibrate the pH Value (for which modbus is best i think).
 
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Raymundo D. Balderas

If you have implemented your serial hardware, you just need to program de ModBus Protocol (I think). For information about this protocol see the web site http://www.modbus.org

Hope this helps.
 
M
Hemant,

Modbus serial is hardware-wise equivalent (identical) to any other serial, asynchronous protocol. After the microprocessor, you need a UART (if not part of the microprocessor/microcontroller) and an RS232 interface - like MAX232.

As simple as that.

Meir
 
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