RS-485 Shield for Raspberry Pi 樹莓派 (103030295) | 拾書所
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RS-485 Shield for Raspberry Pi 樹莓派 (103030295)

$ 400 元 原價 400
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Description

RS-485 is a cost-effective solution in serial communication networks. It can be used up to data rates at 10 Mbit/s or distances up to 1200m at lower speeds. This RS-485 Shield is a standard add-on board for Raspberry Pi. It is integrated with simple screw terminal as well as DB9 interface. 

 

 

Features

  • One driver and one receiver per part
  • EMI noise minimization
  • Transmission rate up to 2.5Mbps
  • No driver slew rate limitation
  • Short-circuit current limited
  • Fail-Safe Applications

 

Typical Applications

  • Low-Power RS-485 Transceivers
  • Level Translators
  • Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks
  • Half-duplex applications

 

Pin Out

 

 

Attention:

          This module do not contain a Raspberry Pi, if you need one please check here

 

Feature¶

  • One driver and one receiver per part
  • EMI noise minimization
  • Transmission rate up to 2.5Mbps
  • No driver slew rate limitation
  • Short-circuit current limited
  • Fail-Safe Applications

Specification¶

Item Value
Operating Supply Voltage 3.3V
Interface RS-485 DB9 Interface X1
RS-485 Screw Interface X1 
2×13 Female Header To Raspberry X1
2×13 Expansion Female Header X1
Grove I2C Interface X1
Data Rate 2.5Mbps
Number of Receivers on 32
Storage Temperature Range -65～160℃
Channel Number 8
Resolution 12-Bit
Power Consumption Different power consumption depending on the transmission rate
Weight 42g
Length 62.0mm
Width 39.2mm
Height 21.8mm

Typical Applications¶

  • Low-Power RS-485 Transceivers 
  • Level Translators
  • Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks
  • Half-duplex applications

Hardware Overview¶

Pin Out¶

Overview

Pin_map

RS-485 DB9 Interface & RS-485 Screw Interface

The 485 interface uses differential signal transmission. Please make sure the port A connect to the port A of the 485 device, and port B connect to the port B of the 485 device. 

485-A: The end A of RS485 data transmit wire, connect to the pin A of the MAX485 chip.
485-B: The end B of RS485 data transmit wire, connect to the pin B of the MAX485 chip.
GND: Connect to the Raspberry Pi GND.

You can click the picture to view the original file

As you can see, GPIO14 and GPIO15 are applied for data transmission, and we use GPIO18 as the enable signal.

For the definition of logic signals, please refer to the table below.

Female Headers to Raspberry

We use a 2X13 Female Header to plug this module into the Raspberry Pi, please make sure the pins are aligned. 

Extension Female Headers

This RS-485 Shield occupies 26 Raspberry Pi pins, and only 5 GPIO pins are actually used. We take these 26 pins out in case you need those pins for other purposes.

GPIO Occupied List

GPIO Number Function
GPIO02 SDA for Grove I2C Port
GPIO03 SCL for Grove I2C Port
GPIO14 Connect to the pin DI of Max485 chip, for data transmission.
GPIO15 Connect to the

Brand Slider