DFR0259 DFROBOT | Alldatasheet

Document overview

  • Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
  • PDF pages: 6

Technical content

Datasheet sections

  • 4.1 Use Setups
  • 4.2 Sample Code

 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  Weldable 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.

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). Open serial monitor of Arduino IDE, find USB-RS485 converter corresponding serial port, send characters "V", you can see the LED status may change, and reply "OK".

Automatic Transmission Mode # This sample codes is for testing the RS485 shiled(automatic transmission mo de). # Editor : YouYou # Date : 2013.9.16 # Ver : 0.1 # Product: RS485 shield # SKU : DFR0259 int led = 13; void setup() Serial.begin(9600); pinMode(led,OUTPUT); void loop() int temp; if(Serial.available()) temp=Serial.read(); if(temp=='V'){ digitalWrite(led,1-digitalRead(led)); Serial.println("OK"); Manual Transmission Mode

# This sample codes is for testing the RS485 shiled(manual transmission mode) # EN=2; # Editor : YouYou # Date : 2013.9.16 # Ver : 0.1 # Product: RS485 shield # SKU : DFR0259 int led = 13; int EN = 2; //Definition RS485 shield enable terminal (the 2nd digital IO po rts), //high for the sending state, the low level of receiving state void setup() Serial.begin(9600); pinMode(led,OUTPUT); pinMode(EN,OUTPUT); void loop() int temp; digitalWrite(EN,LOW); //Enable low, RS485 shield waiting to receive data if(Serial.available()) temp=Serial.read(); if(temp=='V') digitalWrite(led,1-digitalRead(led)); digitalWrite(EN,HIGH); //Enable high, RS485 shield waiting to transm it data Serial.println("OK"); delay(10); //Delay for some time, waiting for data transmitted

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