Banner vibration and temperature sensors come in two types, QM42VT1 and QM42VT2, which can be used to monitor the operation of motors, determine whether they are in a normal vibration and temperature state, and transmit vibration and temperature data to a host computer system to collect data and analyze trends.
Today, I'll share how these two types of sensors can communicate with a host computer via Modbus.
The Modbus communication read register address is shifted forward by one bit, so the Modbus register address corresponding to the Z-AxisRMS Velocity (in/sec) of QM42VT1 is 16 (decimal) and 10 (hexadecimal). The high and low bits of CRC-16 are calculated through CRC check.
The command sent when node ID=1 is bound on the DX80 gateway:
Number of shots: 01 03 00 10 00 06C4 0D
01: Slave address;
03: Function code;
00 10: Starting address;
00 06: Number of registers;
C4 0D: High and low bits of CRC-16.
The number of iterations can be obtained using a serial port debugging assistant:
Number of rounds: 01 03 0C 00 2E 006C 06 25 02 06 00 47 00 B6 BD F3
01: Slave address;
03: Function code;
0C: Returns the number of bytes;
00 2E 00 6C 06 25 02 06 00 47 00 B6: Number of bytes sent;
BD F3: High and low bits of CRC-16.
Analysis of the transmitted byte count 00 2E 00 6C 06 25 02 06 00 47 00 B6 in conjunction with the QM42VT1 sensor register table:
The command sent when node ID=2 is bound on the DX80 gateway is: 01 03 00 20 00 06 C4 02
The instructions corresponding to the other ID numbers can be deduced independently.
The Modbus communication read register address is shifted forward by one bit. As shown in the table above, the Modbus register address corresponding to the Z-AxisRMS Velocity (in/sec) of QM42VT2 is 5200 (decimal) and 1450 (hexadecimal). The high and low bits of CRC-16 are calculated through CRC check.
The instruction for QM42VT2 with ID=1:
Number of shots: 01 03 14 50 00 06C0 29
The number of iterations can be obtained using a serial port debugging assistant:
Number of times: 01 03 0C 00 6C 01 14 22 51 0C 1F 00 47 00 B4 1A 8C
00 6C 01 14 22 51 0C 1F 00 47 00 B4: Number of bytes sent;
The instruction for QM42VT2 with ID=2 is: 02 03 14 50 00 06 C0 1A
The instructions corresponding to the other ID numbers can be deduced independently.
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