Dual channel isolated RS485 HAT for Raspberry Pi
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A two-channel isolated RS485 module for Raspberry Pi. The module is based on SC16IS752+SP3485 chips.
The use of ADUM1412 digital isolators, compared to optocouplers, made it possible to achieve high transmission rates.
The module has multiple protections and isolation for the data and power paths. The module can be controlled via a high-speed SPI interface. It is ideal in the implementation of industrial automation.
Features:
- Raspberry Pi 40PIN GPIO standard connector.
- Contains SC16IS752+SP3485 chips for SPI to RS485 bus conversion, at up to 921600bps.
- Automatic or manual data transmission, configurable via DIP switch.
- Includes TVS (Transient Voltage Suppressor), effective surge suppression, protection against lightning and electrostatic discharge.
- Includes resettable fuses and protection diodes to guarantee a stable and safe power supply.
- Includes LED indicators to indicate correct power supply and transmission status.
- Has SPI pins for connecting a non-Raspberry Pi controller such as an Arduino.
- Software examples available (C and Python).
Specifications:
- UART chip : SC16IS752
- RS485 transceiver : SP3485
- Communication interface : SPI
- Baud rate: 300 ~ 921600 bps
- Power supply: 3.3V / 5V
- Dimensions: 65mm × 56.5mm
- Mounting holes: 3.0mm
Module board description:
- SC16IS752 UART.
- ADUM1412 digital isolator.
- PC817 optocoupler.
- SP3485 RS485 transceiver.
- B0505LS isolated power module.
- RT9193-33 power circuit.
- SMAJ12CA transient suppress diode array.
- Resettable fuse.
- Indicators
PWR: power indicator
RXD/TXD: UART transmission indicator. - Raspberry Pi GPIO connector: for Raspberry Pi connection
- RS485 connector
- MCU control connector: for connecting other controllers e.g. Arduino
- 120Ω end-of-line resistor switch.
- Interrupt pins.
- Operating mode selection
Half-auto: A=0, B=1
Full-auto: A=1, B=0
Dimensions:
Pinouts:
| PIN | Raspberry Pi (BCM) | Description |
|---|---|---|
| VCC | 5V | 3.3V/5V power supply |
| GND | GND | Ground |
| SCK | P21 (SPI1 SCLK) | SPI clock input |
| MOSI | P20 (SPI1 MOSI) | SPI data input |
| MISO | P19 (SPI1 MISO) | SPI data output |
| CS | P18 (SPI1 CS) | SPI chip select |
| IRQ | P24 | Interrupt output |
| EN1 | P27 | Channel 1 TX/RX enable: high for TX, low for RX |
| EN2 | P22 | Channel 2 TX/RX enable: high for TX, low for RX |
Kit contents:
1. 2-CH RS485 HAT
2. 2x20PIN female GPIO connector
3. mounting adapters x 2
Wiki: 2-CH_RS485_HAT
