Item Type: Aluminum UV Transmitter_x000D_ Width: Approx. 8cm / 3.1in_x000D_ Height: Approx. 5.8cm / 2.3in_x000D_ Model: RS-UV-N01-AL_x000D_ Weight: Approx. 306g / 10.8oz_x000D_ Type: Type 485_x000D_ Power Supply: DC7~30V_x000D_ RS-Company Number_x000D_ UV-UV Transmitter_x000D_ N01-485 Communication (RTU Agreement)_x000D_ ALAluminum Shell_x000D_ DC Power Supply (Default)7-30VDC_x000D_ Maximum Power Consumption0.06W_x000D_ Accuracy10% FS(60%RH 25)_x000D_ UV Intensity Range0~15 mW/cm2_x000D_ Resolution0.01 mW/cm2_x000D_ UV Index Range0~15_x000D_ Measurement Wavelength RangeWavelength 290~390 nm_x000D_ Response TimeUV Intensity0.2s_x000D_ UV Index0.2s_x000D_ Output Signal485(RTU Protocol)_x000D_ Interface Specification:_x000D_ Line ColorIntroduction_x000D_ Power SupplyBrownPower Supply (7~30V DC)_x000D_ Blacknegative pole_x000D_ CommunicationGreen485-A_x000D_ Blue485-B_x000D_ _x000D_ Basic Communication Parameters:_x000D_ _x000D_ Code8-Bit Binary_x000D_ Data Bit8 Digits_x000D_ Parity BitNot Support_x000D_ Stop Bit1 Bit_x000D_ Error CheckingCRC (Redundant Cyclic Code)_x000D_ Baud RateCan be set to 2400bit/s, 4800bit/s, 9600bit/s, the factory default is 4800bit/s_x000D_ _x000D_ Data Frame Format Definition: Adopt RTU communication protocol_x000D_ Initial Structure: 4 bytes of time_x000D_ Address Code: 1 byte_x000D_ Function Code: 1 byte, the command function of the command issued by the host. The transmitter can use function codes 0 x 03 (read register data), 0 x 06 (write register data register data), 0 x 10 (write multiple register data)._x000D_ _x000D_ Data Area: N bytes (The data area is specific communication data. Please note that the high byte of 16-bit data is in the front)_x000D_ Error Check: 16-bit CRC code_x000D_ End Structure: 4 bytes of time_x000D_ Address Code: The address of the transmitter, which is unique in the communication network (factory default 0x01)_x000D_ CRC Code: Double-byte check code 1It is based on the principle that a photosensitive element converts ultraviolet light into a measurable electrical signal, realize online monitoring of ultraviolet light. 2The measurement data is more comprehensive. The product outputs 485 signals, can communicate at a distance of 2000 meters, and supports secondary development. 3With wall?mounted waterproof shell, high protection level, can be used in outdoor rain and snow environment for a long time. 4It can measure highly sensitive ultraviolet rays from 290-390nm and accurately measure the intensity of ultraviolet rays. 5It is widely used in environmental, meteorological, agricultural and forestry testing. Measure ultraviolet rays in the air and under artificial light sources. 1 x Transmitter 1 x Connection Line 1 x English Manual Possible reasons why the device cannot be connected to the PLC or computer:_x000D_ _x000D_ 1. The computer has multiple COM ports, and the selected port is incorrect_x000D_ 2. The device address is incorrect, or there are devices with duplicate addresses (all factory settings default to 1)_x000D_ 3. The baud rate, check mode, data bit, and stop bit are wrong_x000D_ 4. The 485 bus is disconnected, or the A and B wires are reversed_x000D_ 5. If there are too many devices or the wiring is too long, power supply should be nearby, add 485 repeater, and add 120 resistance terminal_x000D_ 6. USB to 485 driver is not installed or damaged_x000D_ 7. The equipment is damaged