Sensor matching digital transmitter, RS232, RS485 output
Characteristic:
Stable and reliable performance measurement accuracy and intuitive, compact size, the use of flexible,Universal transmitter, suitable for all kinds of industrial equipment with PC monitoring software, equipped with complete detailed communication protocol, zero calibration, display calibration function.
Digital sensor communication protocol
1, protocol type: RTU MODBUS
Please refer to the specific RTU MODBUS protocol
MODSCAN software can be used to test
2, communication mode: RTU - RS485 MODBUS half duplex, master-slave mode
3,Serial data format: the use of 11 bit data format:
Message frame format of communication between sensor and host computer:
The message frame format of the sensor and the host computer is shown in table 1-3
(in which the current address range of the sensor: 0-99; sensor to receive and send data to a floating point conversion of four bytes, the company provides the host computer calibration procedures
Table 1
message frame format for MODBUS communication
Sensor address (one byte) | Function code (one byte) | Data (4 bytes) | CRC check (2 bytes) |
Table 2
data frame format for sensor transmission
Sensor current address | (function code) 01H | Sensor data (4 bytes) | CRCL+CRCH (2 bytes) |
Table 3
frame information for sensor data
Function description | Message frame format for sensor reception | |||
Address field (sensor) | function code | Data domain | CRC Check field | |
Zero calibration | Current address | 02H | 0000H | CRCL+CRCH |
Full range calibration | Current address | 03H | FFFFH | CRCL+CRCH |
Sensor address modification | Current address | 04H | 0000H-00F7H | CRCL+CRCH |
Output for mV signal | Current address | 05H | 0000H | CRCL+CRCH |
Output voltage signal | Current address | 06H | FFFFH | CRCL+CRCH |