RS485 HAT for Rapsberry Pi A+/B+/2/3/4 (Also works with Zero/ZeroW, but it is HAT size)
SKU: SC220102
EAN:6976158320007
The RS485 HAT from WisdPi is a fully galvanic isolated Serial communication HAT designed for use with the Raspberry Pi.
RS485 can be used across large distances, so isolation of the RS485 bus ensures that your Raspberry Pi is fully protected!
RS485 is in use in many applications like industrial and home automation (for example MODBUS), lighting control (DMX), video surveillance (for example Pelco D) and many more!
Features
RS485 mode (half-duplex)
Galvanic isolation between Raspberry Pi and connected RS485 bus
Enhanced ESD protection
Adjustable automatic transceiver switching for RS485 mode
Adjustable control of transceiver/receiver via GPIO pin
Adjustable Pull-Up, Pull-Down und terminating resistors
Indicator LEDs for RX and TX
Many options are adjustable via DIP switches
Send/Receive Control
Male DB9 Socket
Screw Terminal Block 5mm
CA-IS3082W IC
TX/RX/GND Solder Points
Electrical Characteristics
Max Datarate: 10Mbps
Number of nodes: 50
ESD: 4kV(JEP155)/2kV(JEP157)
Isolation Rating: 1000 Vrms
Working Voltage: 1414 Vpk
Operating Temp: -40℃ ~ 125℃
Power Consumption： 14.4mA(3.3V) / 14.4mA(5V)
Block Scheme
Control Elements
NO.
Description
Spec
1
RPi UART TTL
2.54mm Male Header Pins
2
Send/Receive Control
DIP Switch S1
3
RS485-A/RS485-B
Male DB9 Socket
4
RS485-A/RS485-B
Screw Terminal Block 5mm
5
Termination resistors
2.54mm Male Header Pins
RPi UART TTL (2.54mm Male Header Pins)
NO.
Description
Raspberry Pi GPIO Pins
1
GND
GND
2
TXD
GPIO14
3
RXD
GPIO15
Send/Receive Control (DIP Switch S1)
Channel
Description
1
Receiver always on
2
Transmitter connected to Receiver
3
Automatic DE/RE control
4
DE/RE control via GPIO18
RS485-A/RS485-B (Male DB9 Socket)
RS485-A/RS485-B (Screw Terminal Block 5mm)
NO.
Description
1
RS485-A
2
RS485-B
3
GND
How To Use
Step 1:
Connect the Hat board to the GPIO pins of the Raspberry Pi.
