SM1882B Us er Ma nual
http://www.sonbus.com/
Sha nghai Son
best Industrial Co., Ltd Page2
Brand
SONBEST
Atmospheric pressure range
30~110kpa
Atmospheric pressure accuracy
±
0.5%
Communication Interface
RS485
Default baud rate
9600 8 n 1
Power
DC9~24V 1A
Running temperature
-40~80° C
Working humidity
5%RH~90%RH
Product Size
Wiring instructions
Any incorrect wiring can cause irreversible damage to the product. Please carefull y 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 comma nds
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 se nds the
command:01 03 00 00 00 01 84 0A .
Device ID
Function id
Start Address
Data Length
CRC16
