/** Creates a packet to write data to ModBus. */
public static byte[] makeWritePacket(ModAddr addr)
{
byte[] data = new byte[12];
BE.setuint16(data, 0, tid++); //transaction id
// BE.setuint16(data, 2, 0); //protocol
BE.setuint16(data, 4, 6); //length
// data[6] = 0; //unit ID
data[7] = 5; //set single coil
BE.setuint16(data, 8, addr.io_number - 1);
BE.setuint16(data, 10, addr.state ? 0xff00 : 0x0000);
return(data);
}
/** Creates a packet to read data from ModBus. */
public static byte[] makeReadPacket(ModAddr addr)
{
byte[] data = new byte[12];
BE.setuint16(data, 0, tid++); //transaction id
// BE.setuint16(data, 2, 0); //protocol
BE.setuint16(data, 4, 6); //length
// data[6] = 0; //unit ID
data[7] = readFunc(addr.io_type);
BE.setuint16(data, 8, addr.io_number - 1); //starting addr
BE.setuint16(data, 10, addr.length); //bit count
return(data);
}
public static ModAddr decodeAddress(String addr)
{
//C# - coil output
//DI# = discrete input
ModAddr ma = new ModAddr();
ma.length = 1;
switch (addr.CharAt(0))
{
case 'C':
ma.io_type = ModTypes.C;
ma.io_number = (short)Int32.ValueOf(addr.Substring(1));
break;
case 'D':
ma.io_type = ModTypes.DI;
ma.io_number = (short)Int32.ValueOf(addr.Substring(2));
break;
default:
return(null);
}
return(ma);
}
