Steve Karg
4781582204
* Changed ATmega168 example for ATmega328 on Arduino Uno R3 with DFR0259 RS485 shield. Added ADC interface from BDK port and mapped to some AV objects. Removed MS/TP MAC address DIP switch GPIO and moved MS/TP configuration to AV objects. Added AV units property. Added some Uno R3 Digital Inputs and outputs mapped to some BV. Added AVR EEPROM from BDK port and mapped some non-volatile data including MAC address and max manager and baud rate, device ID and names and description and location.
1.8 KiB
1.8 KiB
Introduction
This is an Arduino RS485 shield, especially designed for the Arduino controller board. It can easily convert the UART to the RS485. This shield integrates:
- a standard RS485 port
- a mini RS485 port (PH2.0 interface)
- RS485 headers
- provides the prototyping areas
- configurable automatic or manual transmission (RTS) mode
- configurable operation or programming mode
Specification
- Power module: +5.0V
- Module size: 55mmx53mm
- 16 digital IO port (including a I2C interface)
- 6 analog IO port and power
- Operation/programming mode switch
- Automatic/manual transceiver mode switch (When in manual transceiver mode, the enable end is the 2nd digital IO port)
- Transceiver indicating LED
- Standard RS485 interface, mini RS485 interface(PH2.0) and RS485 pins
- prototyping area
- Reset button
Pin Definition
Operation and programming mode switch:
- To OFF, you can download the program for the Arduino controller.
- To ON, the shield will convert the UART to the RS485.
Transceiver mode switch:
- To AUTO, the shield is automatically sending and receiving data so you do not care about operation timing
- To MANU, the shield is in manual transceiver status, and the enable end is the 2nd digital IO port. Enabling high-side power Ping to sending state while the low level of the receiving state.
Usage Setup
When the RS485 shield is installed on your Arduino controller, and then you will wire the RS485 shiled with USB-RS485 converter to connect terminals, namely: A pair of A, B on B, GND on GND, then download the following sample code.
Note: Downloading code, run / program mode switch must hit the OFF position, otherwise it will lead to the download fails. When downloaded, it is complete to ON, and the shield to normal use).
Schematic
