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● Precautions
1. After opening the product package, please check whether the appearance of the product is intact,
check whether the relevant content of the product instruction manual is consistent with the product,
and keep the product instruction manual for more than one year;
2. Wiring strictly according to the wiring diagram of the product, and work under the permissible
excitation voltage of the product, and do not use it with overvoltage;
3. Do not knock the product, so as not to damage the appearance and internal structure of the ring;
4. The product has no customer-repairable parts, please contact our company in case of failure;
5. If the company's products fail under normal conditions, the warranty period is one year (13 months
from the date of delivery by our company to the date of return). as the basis. For maintenance
beyond the time limit, the company will charge a basic fee, and all products of the company will be
maintained for life;
6. Please refer to our company website or call us for details.
(RS485) MODBUS communication protocol
● Basic settings of communication protocol
Transmission mode: MODBUS-RTU mode.
Communication parameters: default baud rate 9600bps (optional 2400bps, 4800bps, 9600bps,
19200bps, 38400bps, 57600bps, 115200bps, can be configured according to user requirements), 1
start bit, 8 data bits, no parity (optional odd parity, even parity), 1 stop bit, after changing the
communication parameters, it is recommended to power on the sensor again.
Slave address: The factory default is 1, which can be configured according to user requirements.
● Holding register list
Parameter
Atmospheric pressure
Baud rate
Check Digit
Slave address
MODBUS holding register address (16 bits)
Address: 0000H The read value is the measured value of
atmospheric pressure. For example, the read value is 0x03ED,
converted to decimal 1005, and the measured value of atmospheric
pressure is 1005hPa or 100.5kPa.
Address: 0014H The setting value is 24, 48, 96, 192, 384, 576,
1152, corresponding to the baud rate respectively, 2400, 4800,
9600, 19200, 38400, 57600, 115200, for example, the default baud
rate is 9600, the setting value is 0x0060
Address: 0015H 0x0000 means no parity, 0x0001 means odd
parity, 0x0002 means even parity
Address: 0017H Default: 0x0001
3
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