Mikroelektronika d.o.o.
RS485 5V Click Board
RS485 5V Click Board
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The RS485 5 Click Board™ is equipped with the MAX485, low-power, slew-rate-limited transceiver for RS-485 and RS-422 communication, from Maxim Integrated. This device supports half-duplex RS-485 communication and can be used as an interface between the TTL level UART and the RS485 communication bus. Thanks to the low power consumption and reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, error-free data transmission up to 250kbps is supported.
The RS485 5 Click Board™ is perfectly suitable for EMI-Sensitive Applications, such as industrial-control local area networks, building automation, HVAC systems, and many more.
Software Support
We provide a demo application for the RS485 5V 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 a 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 );
}
// TRANSMITER - 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 5V Click Board
Frequently Asked Questions
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