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THVD1450: Programming RS485 communication

Reginhard Wiegand

Prodigy 50 points

Part Number: THVD1450
Other Parts Discussed in Thread: THVD1410,

Hello,

Are there any examples how could THVD1450/THVD1410 RS485 transceiver be programmed when using protocol such as Modbus RTU (slave and master)? I am using C language environment (CubeIDE) with STM32 microcontroller. Thank you in advance.

over 5 years ago

0 Clemens Ladisch over 5 years ago

Guru 323920 points

These transceivers work on the electrical level; they just convert between logic voltages (0/3.3/5 V) and differential RS-485 voltages. They are not programmed.

Typically, you connect the R/D pins to your microcontroller's UART and program it to handle the Modbus protocol.

0 Reginhard Wiegand over 5 years ago in reply to Clemens Ladisch

Prodigy 50 points

Hello,

Are there any examples of Modbus RTU protocol implementation in C language using UART (RS485)?

Thank you.

0 Clemens Ladisch over 5 years ago in reply to Reginhard Wiegand

Guru 323920 points

The STM32 is not made by TI.

Google says that such libraries exist.

0 Hao L over 5 years ago in reply to Clemens Ladisch

TI__Mastermind 25705 points

Here you may find the modbus demo code.

https://www.embedded-experts.at/en/freemodbus/ports-ascii-rtu/ti-msp430/

0 Reginhard Wiegand over 5 years ago in reply to Hao L

Prodigy 50 points

Hello,

Are there any other simple to understand C language Modbus programming examples for RS485? I could not find the demo code in attached link.

Thank you.

0 Hao L over 5 years ago in reply to Reginhard Wiegand

TI__Mastermind 25705 points

I'm sorry the site is not very clear on where to download the codes. Here is their GitHub site.

https://github.com/cwalter-at/freemodbus/tree/master/demo/MSP430