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How to send command to standard serial port
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Dear Sir:
- I had a hardware(switch), direct connect to computer com1 using R485 line.
- I can turn the switch on/off using standard serial test code.
- I can also using following rxtx( same version as scadabr using) java code to turn it on/off.
now with mango, I created modbus serial data source, and it can scan found 1 node. But when create data point,
there is no "output" option for "Register range", so I do not know how to continue.would you please help me how to create data source ( modbus serial or .. ?) ,
data point and script to turn the switch on/off ?Thanks a lot.
william
wf321@163.com*********************************** RXTX CODE ****************************
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;public static void main ( String[] args )
{
connect("COM1");
}void connect ( String portName ) throws Exception { CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName); CommPort commPort = portIdentifier.open(this.getClass().getName(),2000); SerialPort serialPort = (SerialPort) commPort;
serialPort.setSerialPortParams(4800,SerialPort.DATABITS_8,SerialPort.STOPBITS_2,SerialPort.PARITY_NONE);
System.out.println(serialPort.getName()); InputStream in = serialPort.getInputStream(); OutputStream out = serialPort.getOutputStream(); // send 8 int to control the switch int len = 8; int[] buffer = new int[len]; buffer[0] = 0x01; // com1 buffer[1] = 0x05; buffer[2] = 0x00; // port 0 buffer[3] = 0x01; // channel buffer[4] = 0xff; // turn the switch on , 0X00 means tuen off buffer[5] = 0x00; buffer[6] = 0xdd; // check use crc16 buffer[7] = 0xfa; // check use crc16 for (int i = 0; i < len; i++) { System.out.println(buffer*); out.write(buffer*); } out.flush(); commPort.close(); }
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"output" is not a valid register range. "Input status" and "Input register" are the read-only register ranges.