RS485 8 Click

How does it work?

RS485 8 Click is based on the THVD1426, an RS485 transceiver with auto-direction control and ESD protection from Texas Instruments. The THVD1426 has one termination resistor over the A/B that can be enabled over the TERM jumper. The RS485 8 Click comes with the SM712, a 600W asymmetrical TVS diode array from Littelfuse, along with the termination resistor. This diode array is designed to protect the RS485 applications with asymmetrical working voltages from -7V up to 12V, thus making it safe from damage due to electrostatic discharge, fast electrical transients, and lightning-induced surges. Both the diode array and the termination resistor are placed near the RS485 screw terminal, with which you can connect the RS485 8 Click to your application’s other end.

RS485 8 Click uses the UART interface to communicate with the host MCU with commonly used UART RX and TX pins. The auto-direction mode on the RS485 8 Click is set by default and disabled with a pull-down resistor. It can be enabled with the logic HIGH state on the EN pin of the mikroBUS™ socket. You can control the driver and receiver using the data input pin RX by enabling the transceiver.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

Specifications

Pinout diagram

This table shows how the pinout on RS485 8 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
Enable	EN	2	RST	INT	15	NC
	NC	3	CS	RX	14	TX	UART TX
	NC	4	SCK	TX	13	RX	UART RX
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

RS485 8 Click electrical specifications

Software Support

We provide a library for the RS485 8 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for RS485 8 Click driver.

Key functions

• rs4858_generic_write RS485 8 data writing function.

• rs4858_generic_read RS485 8 data reading function.

• rs4858_enable_device RS485 8 enable the device function.

Example Description

This example reads and processes data from RS485 8 clicks. The library also includes a function for enabling/disabling the receiver or driver and data writing or reading.

void application_task ( void ) 
{
#ifdef DEMO_APP_TRANSMITTER
    rs4858_generic_write( &rs4858, data_buf, strlen( data_buf ) );
    log_info( &logger, "---- Data sent ----" );
    Delay_ms( 2000 );
#else
    rs4858_process( );
#endif 
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.RS4858

Additional notes and informations

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. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.