rs485isolator4  2.1.0.0
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RS485 Isolator 4 click

RS485 Isolator 4 Click is a compact add-on board designed for robust RS-485 and RS-422 half-duplex communication with galvanic isolation. This board features the ISO1450, a 5kVRMS isolated RS-485 transceiver from Texas Instruments. The ISO1450 supports data rates up to 50Mbps and features advanced protection against electrostatic discharge (ESD) and electrical fast transients (EFT), ensuring reliable long-distance communication in industrial environments. It operates over a wide supply voltage range (3V to 5.5V), offering failsafe protection against open, short, and idle bus states.

click Product page


Click library

  • Author : Stefan Filipovic
  • Date : Jun 2024.
  • Type : UART type

Software Support

We provide a library for the RS485 Isolator 4 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

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

Library Description

This library contains API for RS485 Isolator 4 Click driver.

Standard key functions :

Example key functions :

Example Description

This example demonstrates the use of an RS485 Isolator 4 click board by showing

the communication between the two click board configured as a receiver and transmitter.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger and displays the selected application mode.

void application_init ( void )
{
log_cfg_t log_cfg;
rs485isolator4_cfg_t rs485isolator4_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
rs485isolator4_cfg_setup( &rs485isolator4_cfg );
RS485ISOLATOR4_MAP_MIKROBUS( rs485isolator4_cfg, MIKROBUS_1 );
if ( UART_ERROR == rs485isolator4_init( &rs485isolator4, &rs485isolator4_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
#ifdef DEMO_APP_TRANSMITTER
rs485isolator4_driver_enable ( &rs485isolator4 );
rs485isolator4_receiver_disable ( &rs485isolator4 );
log_printf( &logger, " Application Mode: Transmitter\r\n" );
#else
rs485isolator4_driver_disable ( &rs485isolator4 );
rs485isolator4_receiver_enable ( &rs485isolator4 );
log_printf( &logger, " Application Mode: Receiver\r\n" );
#endif
log_info( &logger, " Application Task " );
}

Application Task

Depending on the selected mode, it reads all the received data or sends the desired message every 2 seconds.

void application_task ( void )
{
#ifdef DEMO_APP_TRANSMITTER
log_printf( &logger, "%s", ( char * ) DEMO_TEXT_MESSAGE );
Delay_ms( 1000 );
Delay_ms( 1000 );
#else
uint8_t rx_data = 0;
if ( rs485isolator4_generic_read( &rs485isolator4, &rx_data, 1 ) > 0 )
{
log_printf( &logger, "%c", rx_data );
}
#endif
}

Note

Make sure to provide a power supply voltage to isolated VCC_EXT and GND pins in a range from 3V to 5.5V.

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

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.RS485Isolator4

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 MikroElektronika compilers.


rs485isolator4_generic_write
err_t rs485isolator4_generic_write(rs485isolator4_t *ctx, uint8_t *data_in, uint16_t len)
RS485 Isolator 4 data writing function.
rs485isolator4_t
RS485 Isolator 4 Click context object.
Definition: rs485isolator4.h:107
rs485isolator4_driver_disable
void rs485isolator4_driver_disable(rs485isolator4_t *ctx)
RS485 Isolator 4 driver disable function.
rs485isolator4_cfg_t
RS485 Isolator 4 Click configuration object.
Definition: rs485isolator4.h:126
rs485isolator4_receiver_disable
void rs485isolator4_receiver_disable(rs485isolator4_t *ctx)
RS485 Isolator 4 receiver disable function.
rs485isolator4_cfg_setup
void rs485isolator4_cfg_setup(rs485isolator4_cfg_t *cfg)
RS485 Isolator 4 configuration object setup function.
rs485isolator4_generic_read
err_t rs485isolator4_generic_read(rs485isolator4_t *ctx, uint8_t *data_out, uint16_t len)
RS485 Isolator 4 data reading function.
rs485isolator4_driver_enable
void rs485isolator4_driver_enable(rs485isolator4_t *ctx)
RS485 Isolator 4 driver enable function.
application_task
void application_task(void)
Definition: main.c:77
rs485isolator4_receiver_enable
void rs485isolator4_receiver_enable(rs485isolator4_t *ctx)
RS485 Isolator 4 receiver enable function.
application_init
void application_init(void)
Definition: main.c:38
rs485isolator4_init
err_t rs485isolator4_init(rs485isolator4_t *ctx, rs485isolator4_cfg_t *cfg)
RS485 Isolator 4 initialization function.
DEMO_TEXT_MESSAGE
#define DEMO_TEXT_MESSAGE
Definition: main.c:33
RS485ISOLATOR4_MAP_MIKROBUS
#define RS485ISOLATOR4_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: rs485isolator4.h:93