SONBEST SM1212B-12, Руководство пользователя

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SM1212B-12 Us er Ma nual
http://www.sonbus.com/
Sha nghai Son
best Industrial Co., Ltd Page2
core color is for reference.
Communication Protocol
The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply commands
are hexadecimal data. The default device address is 1 when the device is shipped, the default baud rate is
9600, 8, n, 1
1. Read Data (Function id 0x03)
Inquiry frame (hexadecimal), sending example: Query 1# device 1 data, the host computer sends the
command:01 03 00 00 00 0C 45 CF .
Device ID Function id Start Address Data Length CRC16
01 03 00 00 00 0C 45 CF
For the correct query frame, the device will respond with data:01 03 18 00 79 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 A5 E8 , the response format is parsed as follows:
Device
ID
Function
id
Data
Length
数
据
1
数
据
2
数
据
3
数
据
4
数
据
5
数
据
6
01 03 18 00
79
00
7A
00
7B
00
7C
00
7D
00
7E
Data Description: The data in the command is hexadecimal. Take data 1 as an example. 00 79 is
converted to a decimal value of 121. If the data magnification is 100, the actual value is 121/100=1.21.
Others and so on.
2. Data Address Table
Address Start Address Description Data type Value range
40001 00 00 1#temperatureregister Read only 0~65535
40002 00 01 2#humidityregister Read only 0~65535
40003 00 02 3#temperatureregister Read only 0~65535
40004 00 03 4#humidityregister Read only 0~65535
40005 00 04 5#temperatureregister Read only 0~65535
40006 00 05 6#humidityregister Read only 0~65535
... ... ... ... ...
40023 00 16 23#temperatureregister Read only 0~65535
40024 00 17 24#humidityregister Read only 0~65535
40101 00 64 model code read/write 0~65535
40102 00 65 total points read/write 1~20
40103 00 66 Device ID read/write 1~249
40104 00 67 baud rate read/write 0~6
40105 00 68 mode read/write 1~4
40106 00 69 protocol read/write 1~10
3 read and modify device address
(1) Read or query device address
If you don't know the current device address and there is only one device on the bus, you can use the
command FA 03 00 64 00 02 90 5F Query device address.
Device ID Function id Start Address Data Length CRC16
FA 03 00 64 00 02 90 5F
FA is 250 for the general address. When you don't know the address, you can use 250 to get the real
device address, 00 64 is the device model register.