• Specification

Measurement	DO value in water
Measure range	0~20.00mg/l
Resolution	0.01mg/l
Temperature range	-20~60°C
Type of sensor	Galvanic Cell sensor
Measuring accuracy	<0.5mg/l
Output mode	RS485 port*1
Communication protocol	Compatible with standard MODBUS-RTU protocol
Communication mode	RS485  9600,8,1,N  (by default)
ID	1~255 Default ID 01 (0x01)
Fixing method	RS485 remote setting calibration and parameters
Power supply mode	12VDC
Power consumption	30mA @12VDC

 

• Introduction

• Intelligent module communication protocol Introduction

Communication port: RS485 Port setting: 9600,N,8,1 (by default) Device address: 0x01 (by default) Protocol specifications: Modbus RTU Commands support: 0x03 read register 0X06 write register| 0x10 continuous write register   Information frame format

0x03 read data [HEX]
01	03	×× ××	×× ××	×× ××
Address	Function code	Data head address	Data length	Check code

0x06 write data [HEX]
01	06	×× ××	×× ××	×× ××
Address	Function code	Data address	Write data	Check code

Remarks: The check code is 16CRC with low byte ahead.

0x10 Continuous write data [HEX]
01	10	×× ××	××××
Address	Function code	Data address	Register number
××	×× ××	×× ××
Byte number	Write data	Check code

  Format of register data

Address	Data name	Switch coefficient	Status
0	Temperature	0.1°C	R
1	DO	0.01mg/L	R
2	Saturability	0.1%DO	R
3	Sensor. null point	0.1%	R
4	Sensor. slope	0.1mV	R
5	Sensor. MV	0.1%S	R
6	System status. 01	Format 4*4bit 0xFFFF	R
7	System status.02 User command address	Format: 4*4bit 0xFFFF	R/W

Remarks:Data in each address is a 16-bit signed integer, the length is 2 bytes. The real result=Register data * switch coefficient Status:R=only read; R/W= read/write