Latest revision as of 20:12, 19 July 2019
Raspberry pi RS485 & Can Shield
Raspberry pi RS485 & Can Shield - Front
Raspberry pi RS485 & Can Shield - Back
Overview
RS485&CAN Shield is an industrial communication module for Raspberry Pi, there are on board 2*RS485 Bus and 1*CAN Bus communication interface via SPI interface.
CAN bus and RS485 bus powered through separated isolation power module, signal between the transceiver and the controller is isolated , ESD protection for the communication port, ensure your raspberry pi can be used in more strictly industrial scene.
Features
- Compatible with Raspberry Pi 4 Model B/3B+/3B/2B/Zero/Zero W.
- Only a small amount of GPIO are used and the rest pins allow to work for other expansion function. please refer to RS485 CAN Shield#GPIO MAP
- Power supply and signal isolation, Build-in surge and ESD protection.
- CAN function, onboard CAN controller MCP2515 via SPI interface, onboard high speed CAN transceiver, onboard digital isolation ADUM1201BRZ, Communication Rates 20Kbps-1Mpbs can be programmed arbitrarily.
- RS485 function, controlled via UART, half-duplex communication, supports automatic TX/RX control without programming, onboard SPI to RS485 SC16IS1752. Electrical data isolation ADM2483.
- On board individual 120 Ohm terminal resistance, Impedance matching and guarantee the ability to drive.
GPIO MAP
| PIN No |
PIN of Rpi |
Usage
|
| PIN19 |
GPIO_10 |
SPI0 MOSI
|
| PIN21 |
GPIO_9 |
SPI0 MISO
|
| PIN23 |
GPIO_11 |
SPI0 SCLK
|
| PIN24 |
GPIO_8 |
RS485 Transfer Chip Selection
|
| PIN26 |
GPIO_7 |
CAN Transfer Chip Selection
|
| PIN18 |
GPIO_24 |
RS485 Interrupt
|
| PIN22 |
GPIO_25 |
CAN Interrupt
|
Output Interface
| No. |
Function |
Description
|
| 1 |
RS485_A1 |
RS485-1 A Single
|
| 2 |
GND_485 |
RS485-1 Isolated GND
|
| 3 |
RS485_B1 |
RS485-1 B Single
|
| 4 |
RS485_A2 |
RS485-2 A Single
|
| 5 |
GND_ISO |
RS485-2 Isolated GND
|
| 6 |
RS485_B2 |
RS485-2 B Single
|
| 7 |
CANH |
CAN-H
|
| 8 |
CAN_GND_ISO |
CAN Isolated GND
|
| 9 |
CANL |
CAN-L S
|
Packing List
- 1 x shield
- F/M Spacer 2.5*16+6 x 4 pieces
- Screw 2.5*6 x 4 pieces
Document
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