Difference between revisions of "RS-485 Breakout"
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− | Click here to buy [RS-485 Breakout] | + | Click here to buy [RS-485 Breakout http://www.geeetech.com/uart-to-rs485-breakout-p-619.html] |
Revision as of 01:22, 22 January 2013
Contents
Overview
This is a breakout board for the RS-485 transceiver IC, which will convert a UART serial signal to RS-485. This chip is a half-duplex transceiver, so it can only communicate one way at a time, but it can reach transmission speeds of up to 2.5Mbps. This board requires a very low amount of power and can operate from a single +5VDC supply.
This breakout board includes the SP3485 RS-485 transceiver, filter capacitor. We've broken out the RS-485 output to three different connections: (1) an RJ-45 connector, (2) a 3-pin 3.55mm screw terminal, and (3) a 3-pin 0.1" pitch header
Features
- Fully equipped with SP3485 RS-485 transceiver and supporting components
- Operates from a single +5V supply
- Interoperable with +5.0V logic
- RS-485 input/output broken out to RJ-45 connector, 3.5mm screw terminal, and 0.1" pitch header
- Driver/Receiver Enable connected to RTS line
- -7V to +12V Common-Mode Input Voltage Range
- Allows up to 32 transceivers on the serial bus
- Driver Output Short-Circuit Protection
Usage
Here is an example below illustrates how to transimit and receive data via RS-485 signal.
RS485 Transmitter
int EN = 2; void setup() { pinMode(EN, OUTPUT); Serial.begin(19200); } void loop() { // send data digitalWrite(EN, HIGH);/ Serial.print('A'); Serial.print('B'); delay(1000); }
RS485 Receiver
int ledPin = 13; int EN = 2; int val; void setup() { pinMode(ledPin, OUTPUT); pinMode(EN, OUTPUT); Serial.begin(19200); } void loop() { // receive data digitalWrite(EN, LOW); val = Serial.read(); if (-1 != val) { if ('A' == val) { digitalWrite(ledPin, HIGH); delay(500); digitalWrite(ledPin, LOW); delay(500); } } }
Document
How to buy
Click here to buy [RS-485 Breakout http://www.geeetech.com/uart-to-rs485-breakout-p-619.html]