Waveshare RS485 CAN pHAT for Raspberry Pi

Waveshare RS485 CAN pHAT - RS485 & CAN interface for Raspberry Pi.

RS485 CAN pHAT extends the Raspberry Pi with the possibility of communication via the RS485 / CAN protocol, ie. stably and over long distances.

CAN and RS485 are two popular standards in fieldbuses.

• RS485 deals only with layer 1 (physical layer) in the OSI model. It is very simple, universal and robust.
• CAN adds layer 2 (data link layer) in the OSI model. In terms of a higher level of the protocol and its ability to handle errors and crashes, it is much better than RS485, but if there are no SW libraries for a given platform, it is significantly more difficult to implement. CAN is not suitable for applications in which large blocks of data need to be transmitted.

Features

• Compatible with Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+
• CAN function, built-in CAN controller MCP2515 via SPI interface, with transmitter & receiver SN65HVD230
• RS485 function, controlled via UART interface, half-duplex communication, with SP3485 transmitter & receiver
• Dedicated control pins allow you to work with other control computers     
• Comes with development materials and user guide (examples in WiringPi and Python)
  

Specification

• Operating voltage: 3.3V
• CAN controller: MCP2515
• CAN transceiver: SN65HVD230
• RS485 transceiver: SP3485
• Dimension: 65mm x 30mm
• Mounting hole size: 3.0mm

Pinout

• 3V3 - 3V3 - 3.3V Power
• GND - GND - Ground
• SCK - P11/SCLK - SPI clock input
• MOSI - P10/MOSI - SPI data input
• MISO - P9/MISO - SPI data output
• CS - P8/CEO - SPI chip selection
• INT - P25 - Interrupt
• RXD - P15/RXD - RS485 UART receive
• TXD - P14/TXD - RS485 UART transmit
• RSE - P4 - RS485 RX/TX setting, high for TX, low for RX