/**
* Read one value of the slave
*
* @param address Address of Memory of value in slave
* @return the read value
*/
public int sendReadRequest(int address) throws Exception {
ReadInputRegistersResponse response = null;
short tmp_value = 0;
try {
ReadInputRegistersRequest request = new ReadInputRegistersRequest(address, 1);
response = (ReadInputRegistersResponse) this.sendRequest(request);
tmp_value = response.getRegister(0).toShort();
if (tmp_value == 0x7FFF) throw new Exception("0x7FFF received - value ignored");
} catch (Exception ex) {
log.warning("Error on reading value: " + ex.getMessage());
throw ex;
}
return tmp_value;
}
public ModbusResponse createResponse() {
ReadInputRegistersResponse response = null;
InputRegister[] inpregs = null;
// 1. get process image
ProcessImage procimg = ModbusCoupler.getReference().getProcessImage();
// 2. get input registers range
try {
inpregs = procimg.getInputRegisterRange(this.getReference(), this.getWordCount());
} catch (IllegalAddressException iaex) {
return createExceptionResponse(Modbus.ILLEGAL_ADDRESS_EXCEPTION);
}
response = new ReadInputRegistersResponse(inpregs);
// transfer header data
if (!isHeadless()) {
response.setTransactionID(this.getTransactionID());
response.setProtocolID(this.getProtocolID());
} else {
response.setHeadless();
}
response.setUnitID(this.getUnitID());
response.setFunctionCode(this.getFunctionCode());
return response;
} // createResponse