modbus static method
Implementation
static Uint8List modbus(int slave, int func , Uint8List data){
var todata = Uint8List(4 + data.length);
todata[0] = slave;
todata[1] = func;
for(var i=0; i<data.length; i++) {
todata[2+i] = data[i];
}
crc16(todata);
return todata;
}