SD2100B Us er Ma nual
http://www.sonbus.com/
Sha nghai Son
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Temperature measuring range
-30
℃
~80
℃
Temperature measuring accuracy
±
0.5
℃
@25
℃
Communication Interface
RS485
Default baud rate
9600 8 n 1
Power
DC9~24V 1A
Display
LCD
Running temperature
-40~80° C
Working humidity
5%RH~90%RH
Wiring instructions
Any incorrect wiring can cause irreversible damage to the product. Please carefully wire the cable as
follows in the case of power failure, and then connect the cable to confirm the correctness and then use it
again.
ID
Core color
Identification
Note
1
Red
V+
Power +
2
Green
V-
Power -
3
Yellow
A+
RS485 A+
4
Blue
B-
RS485 B-
In the case of broken wires, wire the wires as shown in the figure. If the product itself has no leads, the
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 01 84 0A .
Device ID
Function id
Start Address
Data Length
CRC16
01
03
00 00
00 01
84 0A
For the correct query frame, the device will respond with data:01 03 02 00 79 79 A6 , the response
format is parsed as follows:
Device ID
Function id
Data Length
data 1
Check Code
01
03
02
00 79
79 A6
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 01
temperature
read
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
