RAEGuard S EC / LEL / IR User’s Guide390x03: Read Holding RegistersRequesting Message:DeviceAddressFunc-tionCodeRegisterAddressHighByteRegisterAddressLowByteQuantityofRegistersHighByteQuantityofRegistersLow ByteCRCLowByteCRCHighByteClient ID 03 00 08 00 02 CRC CRCAnswering Message:DeviceAddressFunctionCodeByteCountRegister Value CRCLowByteCRCHighByteClient ID 03 04 ReadingHighestByteReadingHigherByteReadingHighByteReadingLowByteCRC CRCNote: The length of data from the detector is 4 bytes.Example:Request: 01 03 00 09 00 02 14 09Answer: 01 03 04 00 00 00 34 FB E4Note: The maximum distance should be less than 1 km when using a1.5 mm2 cable.