RS485 Click Board 3.3V
RS485 Click Board 3.3V
The RS-485 3.3V Click Board™ is a compact accessory board designed to add bidirectional data communication to the design. The board features a Texas Instruments SN65HVD12 differential line transceiver that provides high-speed bidirectional data communication on multipoint bus transmission lines. Compliant with EIA standards RS-485 and RS-422, this 3.3V version of RS485 Click Board™ is intended for balanced data transmission.
The RS485 Click Board™ 3.3V board features four screw terminals.
Software Support
We provide a demo application for the RS485 3.3V Click Board™ on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Library Description
Library initializes and defines GPIO driver and performs control of device voltage.
For more details check the documentation.
Key Functions
void rs485_writeByte(uint8_t input)
- Write Single Byte.uint8_t rs485_readByte()
- Read Single Byte.uint8_t ras485_byteReady()
- Check for new byte received.
Example Description
The application is composed of three sections:
- System Initialization - Initializes UART module.
- Application Initialization - Driver intialization.
- Application Task - (code snippet) - Checks if new data byte has been received in the RX buffer (ready for reading), and if it has then it reads one byte from the RX buffer. Otherwise, the application task writes the message data via UART.
void applicationTask() { char tmp; uint8_t rdyFlag; // RECEIVER - UART polling rdyFlag = rs485_byteReady(); if (1 == rdyFlag) { tmp = rs485_readByte(); mikrobus_logWrite( &tmp, _LOG_BYTE ); } // TRANSMITTER - TX each 2 sec /* for (tmp = 0; tmp < 9; tmp++) { rs485_writeByte( MESSAGE_DATA[tmp] ); mikrobus_logWrite( "MESSAGE SENT", _LOG_LINE ); } Delay_ms(2000); */ }
The full application code and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in this example:
- UART
Additional Notes and Information
Depending on the development board you are using, you may need USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
RS485 Click Board 3.3V
Frequently Asked Questions
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