TECHNICAL SPECIFICATION
|
Item |
Specifications |
|
Priciple |
Electrochemical |
|
Measuring range |
0～5000ppm |
|
Accuracy |
±70ppm |
|
Workin voltage |
DC12V |
|
Working current |
DC12V <35ma(485);DC12V <55ma(current) |
|
Power Consumption |
DC12V <0.42W (485);DC12V <0.66W (current) |
|
Output |
4-20mA, RS485(Modbus) |
|
Load capacity |
Current mode output impedance≤500Ω |
|
Standard line length |
1.5m |
|
Farthest lead wire |
Current 200m, RS485 100m |
|
Working temperature |
0℃～50℃ |
|
Working Humidity |
0～100%RH |
|
Preheating time |
< 1 minute |
|
Ingress Protection |
IP65 |
COMMUNICATION PROTOCOL
Communication specification
Baud rate：9600
Data bit：8
Stop bit：1
Check bit：None
Flow control：None
Unified format of data package
(XX: slave station No. 0x01-0xff; crclo crchi: CRC check code low byte first, high byte last)
Write station number command
Host send command format：
Device address Function code Start register address No. of registers Data length Data CRC check
xx 10 0001 0001 02 00xx CRCloCRChi(XX=0X01-0XFF)
Slave response command format：
Device address Function code Start register address No. of registers CRC check
xx 10 0001 0001 CRCloCRChi
Example：
Command 00 10 00 01 00 01 02 00 33 EA 04
Respond 00 10 00 01 00 01 51 D8
Read station number command (fixed command)
Host send command format：
Device address Function code Start register address No. of registers CRC check
00 03 0001 0001 CRCloCRChi
Slave response command format：
Device address Function code Data length Data CRC check
00 03 02 00xx CRCloCRChi(XX=01-ff)
Example：
Command 00 03 00 01 00 01 D4 1B
Respond 00 03 02 00 FF C5 C4
Read station number command
Host send command format：
Device address Function code Start register address No. of registers CRC check
xx 03 0000 0001 CRCloCRChi
Slave response command format：
Device address Function code Data length Data CRC check
xx 03 02 00yy CRCloCRChi
Example：
Command FF 03 00 00 00 01 91 D4
Respond FF 03 02 00 0A 91 36
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