The RS485 6 Click Board™ is designed to offer you easy usage and testing of the THVD1429DT half-duplex RS485 transceiver. One of the most important features is surge protection which is achieved by integrating transient voltage suppressor (TVS) diodes in the package. This feature provides a substantial increase in reliability for better immunity to noise transients coupled to the data cable, eliminating the need for external protection components.
An RS-485 bus consists of multiple transceivers connecting in parallel to a bus cable. To eliminate line reflections, each cable end is terminated with a termination resistor whose value matches the characteristic impedance of the cable. This method, known as parallel termination, allows for higher data rates over longer cable length. This device supports up to 256 Bus Nodes in one network with higher data rates up to 20 Mbps, in cases where the interconnect is short enough (or has suitably low attenuation at signal frequencies) to not degrade the data.
The THVD1329DT supports several functional modes that can be selected by using RE and DE pins on the mikroBUS connector. To know more how to use these modes take a look at the "Device Functional Modes" table below. For communication with the RS485 6 Click standard UART communication can be used.
This device offer several protections for the pins connected to a bus line, such as: Electrostatic Discharge (ESD) Protection against ±16-kV HBM and ±8-kV contact discharge, Electrical Fast Transient (EFT) Protection where inductive loads such as relays, switch contactors, or heavy-duty motors can create high-frequency bursts during transition and Surge transients that often result from lightning strikes (direct strike or an indirect strike which induce voltages and currents), or the switching of power systems, including load changes and short circuit switching. These transients are often encountered in industrial environments, such as factory automation and power-grid systems.
Since this device feature a wide common-mode voltage range which makes them suitable for multi-point applications over long cable runs. The RS485 6 Click Board™ can be supplied and interfaced with both 3.3V and 5V without the need for any external components. The onboard SMD jumper labeled as VCC SEL allows voltage selection for interfacing with both 3.3V and 5V microcontrollers.
| Type | RS485 |
| Applications | This device is perfectly suitable for wireless infrastructure, building automation, HVAC systems or factory automation, smart meters. |
| On-board modules | THVD1329DT a half-duplex RS-485 communication with integrated surge protection from Texas Instruments |
| Key Features | Surge protection on the RS485 Line, up to 256 nodes, signaling rate of up to 20 Mbps. |
| Interface | UART |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
This table shows how the pinout on the RS485 6 Click Board™ 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 | ||
| NC | 2 | RST | INT | 15 | DE | Driver enable(active hight) | |
| Receiver Enable | RE | 3 | CS | RX | 14 | TXD | UART transmit |
| NC | 4 | SCK | TX | 13 | RXD | UART Receive | |
| 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 |
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | -0.5 | - | 7 | V |
| Signaling Rate | - | - | 20 | Mbps |
| Bus Voltage | -15 | - | 15 | V |
| Receiver Output Current | -24 | - | 24 | mA |
| Electrostatic Discharge | - | +/-16 | - | kV |
| INPUT | ENABLE | OUTPUTS | FUNCTION | |
|---|---|---|---|---|
| D | DE | A | B | |
| H | H | H | L | Active drive bus hight |
| L | H | L | H | Active drive bus low |
| X | L | Z | Z | Drive disabled |
| X | OPEN | Z | Z | Driver disabled by default |
| OPEN | H | H | L | Actively drive bus high by default |
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED indicator |
| JP2 | VCC SEL | Left | Power supply voltage selection: left position 3V3, right position 5V |
We provide a library for the RS485 6 Click 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 provides functions for communication via UART module, and control over RE and DE pins.
void rs4856_write_byte ( uint8_t input ) - Write single byte of datauint8_t rs4856_read_byte( ) - Read single byte of datauint8_t rs4856_byte_ready ( ) - .The application is composed of three sections :
void application_task ( )
{
char tmp;
if ( app_mode == APP_MODE_RECEIVER )
{
// RECEIVER - UART polling
rs4856_re_pin_set( RS4856_PIN_STATE_LOW );
rs4856_de_pin_set( RS4856_PIN_STATE_LOW );
drdy_flag = rs4856_byte_ready( );
if ( 1 == drdy_flag )
{
tmp = rs4856_read_byte( );
mikrobus_logWrite( &tmp, _LOG_BYTE );
}
}
else
{
// TRANSMITTER - TX each 2 sec
rs4856_re_pin_set( RS4856_PIN_STATE_HIGH );
rs4856_de_pin_set( RS4856_PIN_STATE_HIGH );
for ( tmp = 0; tmp < 9; tmp++ )
{
rs4856_write_byte( demo_message_data[ tmp ] );
}
Delay_ms( 2000 );
}
}
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
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.
The RS485 6 Click Board™ is supported with mikroSDK - MikroElektronika 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.
- attachments: [{"download_file":[{"download_file":"RS485 6 Click Board™ Schematic"}],"download_filetype":[{"download_filetype":"pdf"}]},{"download_file":[{"download_file":"Texas Instruments THVD1429DT USRT to RS485 Transceiver Datasheet"}],"download_filetype":[{"download_filetype":"pdf"}]}] - condition: new - custom_product: false - mpn: MIKROE-3993 - google_product_category: Electronics - custom_label_0: Click Board - device_vendor: Texas Instruments - device_type: THVD1429DT - warranty: 12 months - brand: MikroE - manufacturer: Mikroelektronika d.o.o. - target_keyword: RS485 6 Click Board - brands: gid://shopify/Metaobject/56256004319 - breadcrumbs: ["gid://shopify/Collection/447955239135","gid://shopify/Collection/241680580797","gid://shopify/Collection/241546100925"] - customhs_code: 847330 - detailed_description: {"type":"root","children":[{"type":"heading","level":3,"children":[{"type":"text","value":"How Does The RS485 6 Click Board™ Work?"}]},{"type":"paragraph","children":[{"type":"text","value":"The "},{"type":"text","value":"RS485 6 Click Board™","bold":true,"italic":true},{"type":"text","value":" is designed to offer you easy usage and testing of the THVD1429DT half-duplex RS485 transceiver. One of the most important features is surge protection which is achieved by integrating transient voltage suppressor (TVS) diodes in the package. This feature provides a substantial increase in reliability for better immunity to noise transients coupled to the data cable, eliminating the need for external protection components."}]},{"type":"paragraph","children":[{"type":"text","value":""}]},{"type":"paragraph","children":[{"type":"text","value":"An RS-485 bus consists of multiple transceivers connecting in parallel to a bus cable. To eliminate line reflections, each cable end is terminated with a termination resistor whose value matches the characteristic impedance of the cable. This method, known as parallel termination, allows for higher data rates over longer cable length. This device supports up to 256 Bus Nodes in one network with higher data rates up to 20 Mbps, in cases where the interconnect is short enough (or has suitably low attenuation at signal frequencies) to not degrade the data."}]},{"type":"paragraph","children":[{"type":"text","value":"The THVD1329DT supports several functional modes that can be selected by using RE and DE pins on the mikroBUS connector. To know more how to use these modes take a look at the \"Device Functional Modes\" table below. For communication with the RS485 6 Click standard UART communication can be used."}]},{"type":"paragraph","children":[{"type":"text","value":"This device offer several protections for the pins connected to a bus line, such as: "},{"type":"text","value":"Electrostatic Discharge (ESD)","bold":true},{"type":"text","value":" Protection against ±16-kV HBM and ±8-kV contact discharge, "},{"type":"text","value":"Electrical Fast Transient (EFT)","bold":true},{"type":"text","value":" Protection where inductive loads such as relays, switch contactors, or heavy-duty motors can create high-frequency bursts during transition and "},{"type":"text","value":"Surge ","bold":true},{"type":"text","value":"transients that often result from lightning strikes (direct strike or an indirect strike which induce voltages and currents), or the switching of power systems, including load changes and short circuit switching. These transients are often encountered in industrial environments, such as factory automation and power-grid systems."}]},{"type":"paragraph","children":[{"type":"text","value":"Since this device feature a wide common-mode voltage range which makes them suitable for multi-point applications over long cable runs. The "},{"type":"text","value":"RS485 6 Click Board™","bold":true},{"type":"text","value":" can be supplied and interfaced with both 3.3V and 5V without the need for any external components. The onboard SMD jumper labeled as VCC SEL allows voltage selection for interfacing with both 3.3V and 5V microcontrollers."}]},{"type":"heading","level":3,"children":[{"type":"text","value":"SPECIFICATIONS"}]},{"type":"paragraph","children":[{"type":"text","value":"Type\nRS485\nApplications\nThis device is perfectly suitable for wireless infrastructure, building automation, HVAC systems or factory automation, smart meters.\nOn-board modules\nTHVD1329DT a half-duplex RS-485 communication with integrated surge protection from Texas Instruments\nKey Features\nSurge protection on the RS485 Line, up to 256 nodes, signaling rate of up to 20 Mbps.\nInterface\nUART\nCompatibility\nmikroBUS\nClick board size\nS (28.6 x 25.4 mm)\nInput Voltage\n3.3V or 5V"}]},{"type":"paragraph","children":[{"type":"text","value":" "}]},{"type":"heading","level":3,"children":[{"type":"text","value":"PINOUT DIAGRAM"}]},{"type":"paragraph","children":[{"type":"text","value":"This table shows how the pinout on the "},{"type":"text","value":"RS485 6 Click Board™","bold":true},{"type":"text","value":" corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns)."}]},{"type":"paragraph","children":[{"type":"text","value":"Notes\nPin\nPin\nNotes\nNC\n1\nAN\nPWM\n16\nNC\nNC\n2\nRST\nINT\n15\nDE\nDriver enable(active hight)\nReceiver Enable\nRE\n3\nCS\nRX\n14\nTXD\nUART transmit\nNC\n4\nSCK\nTX\n13\nRXD\nUART Receive\nNC\n5\nMISO\nSCL\n12\nNC\nNC\n6\nMOSI\nSDA\n11\nNC\nPower Supply\n3.3V\n7\n3.3V\n5V\n10\n5V\nPower Supply\nGround\nGND\n8\nGND\nGND\n9\nGND\nGround"}]},{"type":"heading","level":3,"children":[{"type":"text","value":"RS485 6 CLICK ELECTRICAL SPECIFICATIONS"}]},{"type":"paragraph","children":[{"type":"text","value":"Description\nMin\nTyp\nMax\nUnit\nSupply Voltage Range\n-0.5\n-\n7\nV\nSignaling Rate\n-\n-\n20\nMbps\nBus Voltage\n-15\n-\n15\nV\nReceiver Output Current\n-24\n-\n24\nmA\nElectrostatic Discharge\n-\n+/-16\n-\nkV"}]},{"type":"heading","level":3,"children":[{"type":"text","value":"DEVICE FUNCIONAL MODES"}]},{"type":"paragraph","children":[{"type":"text","value":"INPUT\nENABLE\nOUTPUTS\nFUNCTION\nD\nDE\nA\nB\nH\nH\nH\nL\nActive drive bus hight\nL\nH\nL\nH\nActive drive bus low\nX\nL\nZ\nZ\nDrive disabled\nX\nOPEN\nZ\nZ\nDriver disabled by default\nOPEN\nH\nH\nL\nActively drive bus high by default"}]},{"type":"heading","level":3,"children":[{"type":"text","value":"ONBOARD SETTINGS AND INDICATORS"}]},{"type":"paragraph","children":[{"type":"text","value":"Label\nName\nDefault\n Description\nLD1\nPWR\n-\nPower LED indicator\nJP2\nVCC SEL\nLeft\nPower supply voltage selection: left position 3V3, right position 5V"}]},{"type":"heading","level":3,"children":[{"type":"text","value":" "}]}]} - summary:The RS485 6 Click Board™ offers a half-duplex RS-485 communication with integrated surge protection, which can be used as an interface between the TTL level UART and the RS485 communication bus. It is based on THVD1429DT, a transceiver from Texas Instruments with a signalling rate of up to 20 Mbps. This device features a wide common-mode voltage range from 3.3V to 5V, which makes it suitable for multi-point applications over long cable runs and noisy areas thanks to the integrated transient voltage suppressor (TVS) diodes. This device and type of network is perfectly suitable for wireless infrastructure, building automation, HVAC systems or factory automation, and many more.
The RS485 6 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click Board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.