Surge Arrester Online Monitor RS485 Remote Transmission Version
Surge arrester online monitor RS485 remote version (BLQPT-RS485-A)
1、 Hardware wiring
Connect the power supply with a wide voltage input of 10-30V, RS485 interface with photoelectric isolation protection, standard Modbus RTU protocol, accurate real-time measurement of full current, lightning strike frequency, etc.
2、 Functional and technical indicators
Accurately measure the full current signal and lightning strike count.
Full current measurement range: 0~3mA, accuracy: 0.01mA
The lightning strike counting part triggers the lightning strike counting when the instantaneous current is greater than 20A, with a count value of 0-500
Integrated RS485 interface and Modbus RTU protocol, achieving full current and lightning counting remote transmission at 9600 baud rate.
3、 Communication Protocol
4、 Debugging steps
(1) Prepare a 24V power supply, USB to 485 module, and connect the lightning arrester monitor with an aviation wiring harness to the power supply and 485 module TA/TB, and connect it to a computer.
(2) Using the serial port debugging assistant or Modbus RTU debugging tool, configure the communication baud rate (9600), send a read command (the read data command in the communication example), and observe the feedback data.
(3) Address modification. Write any value to address 14H, unlock and modify parameter enable for 60 seconds. Within 60 seconds, address 09 can be modified and written to the set address, or the lightning strike count can be cleared. (See communication example for details)
5、 Examples of Communication
Read data:
Sent: 01 03 00 00 02 C4 0B
01- Address 1
03- Read Command
00 00- Starting address
00 02- Two unit data
C4 0B - CRC Check
Reply 01 03 04 00 15 00 02 6A 36
01- Address 1
03- Read Command
04-4 bytes of data
00 15- Full current 21 represents 0.21mA
00 02-2 lightning strikes
6A 36- CRC Check
Enable writing data:
Sent: 01 06 00 14 00 00 C9 CE
01- Address 1
06- Write Command
00 14- Write Address
00 00- Write Data Any Data
C9 CE - CRC verification
Reply 01 06 00 14 00 00 C9 CE
If you need to modify the communication address, you need to first send a write data enable
Write data to modify address:
Sent: 01 06 00 09 00 02 B8 09
01- Address 1
06- Write Command
00 09- Write Address 09 Address Modification
00 02- Write Data 02 Address Change to 02
Reply the same
Write data to clear lightning strike records:
Sent: 01 06 00 15 00 00 98 0E
01- Address 1
06- Write Command
00 15- Write Address 21 to clear lightning strike record address
00 00- Write Data Any Data
Reply the same
