P1-485 RPI HAT
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)
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
- Receiver always on
- Transmitter connected to Receiver
- Automatic DE/RE control
- DE/RE control via GPIO18
RS485-A/RS485-B (Male DB9 Socket)
RS485-A/RS485-B (Screw Terminal Block 5mm)
Description
- RS485-A
- RS485-B
- GND
How To Use
Step 1:
Connect the Hat board to the GPIO pins of the Raspberry Pi.
Step 2:
Use RS232 just like a common Raspberry Pi
Outline Dimensions
· 65x62.5x25.7mm
PACKAGE CONTENT
· Pi-485 HAT x 1
· Screwdriver x 1
· Screws pack x 1
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P1-485 RPI HAT
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