Modbus rtu protocol

mahdhu kommu1

Other Parts Discussed in Thread: MSP430F5329, TMS320F28062, SN65HVD3082E, THVD1500, ISO3082

HI All,

started working on modbus protocol, i searched about modbus protocol and how it will work and difference between RTU and ASCII format, after search got information is modbus protocol implementation is possible with RS232 and RS485 communication.

now my doubt is, is there any driver IC's for Modbus rtu communication otherwise need to implement everything itself means response of slave and errors.

my work is want to implement modbus protocol for single master with 35 slaves.kindly help me.

over 6 years ago

0 mahdhu kommu1 over 6 years ago

Intellectual 640 points

HI All,

want to implement modbus protocol in between MSP430F5329(Master) and TMS320F28062(slave).

0 Bob Crosby over 6 years ago

TI__Guru 72500 points

If you want to do Modbus RTU, you want RS485 devices connected to the UART of the microcontrollers. something like the SN65HVD3082E. I will move this thread to the industrial interface forum. They can help you find the best RS485 driver device for your application.

0 Miguel Robertson over 6 years ago in reply to Bob Crosby

TI__Guru 62920 points

I agree with Bob's comment, and would just add that you may want to consider the newer THVD1500 device since it has a number of advantages over the previous-generation SN65HVD3082E solution. Either solution would be able to work with 32 slave nodes (this is generally a minimum requirement for an RS-485-compliant transceiver).

Regards,
Max

0 mahdhu kommu1 over 6 years ago in reply to Miguel Robertson

Intellectual 640 points

thanks Bob and MaxRobertson giving quick replay,

using UART to RS485 driver IC(ISO3082), my doubt is modbus protocol driver IC 's are available? means master RS485 output to modbus driver IC and slave side modbus driver IC to rs485 driver IC .

other wise need to implement the protocol.

kindly help me.

0 Miguel Robertson over 6 years ago in reply to mahdhu kommu1

TI__Guru 62920 points

Mahdhu,

Please correct me if I am misinterpreting what you need, but typically this protocol would be implemented via the microcontroller - I have not seen something like a standalone Modbus protocol bridge.

Max

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Modbus rtu protocol