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GM8904GM8904

GM8904 / BENETECH เครื่องวัดความเร็วลม Handheld Anemometer

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GM8904 / BENETECH เครื่องวัดความเร็วลม Handheld anemometer this agreement is used to agree on the communication protocol between the anemometer (lower computer) and the host computer (computer or smart device) for order control and data exchange. It adopts UART specification to facilitate the secondary development of the developer.
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เครื่องวัดความเร็วลม รุ่น GM8904 แบรนด์ BENETECH 

Handheld Anemometer 

Communication protocol

1. Overview

This agreement is used to agree on the communication protocol between the anemometer (lower computer) and the host computer (computer or smart device) for order control and data exchange. It adopts UART specification to facilitate the secondary development of the developer. GM8904

2. Scope

The "agreement" provides the functions are:

2.1. PC through the command to control the wind speed measurement module to complete the specified tasks, such as access to wind speed, temperature data;
2.2. Receiving time-out, if the received response is not the corresponding one, the receiving checksum is incorrect, and the receiving length byte is invalid, the command will be sent again immediately if the communication fails.

3. Glossary

Host computer: Management of wind speed measurement module dedicated intelligent equipment;
Lower computer: the anemometer;
RS232 : A 2-wire serial communication standard that supports duplex serial proximity communication;

4. physical interface

4.1. serial communication port electrical standards: The module uses the TTL level (3.3V) to communicate with the host computer via RS232 protocol
4.2. Information transmission method: Asynchronously, . 1 start bit, . 8 data bits . 1 stop bit, no parity bit.
4.3. data transfer rate: Support baud rate 19200bps .

Working current

unit Minimum Typical value Maximum
mA 7 8 10
Operating Voltage
unit Minimum Typical value Maximum
V 3.6 5 9.5

 

Wind speed measurement error

unit Measuring range Resolution Threshold Accuracy
m / s ( m / s ) 0 ~ 4 5 0 .1 0 . 8 ±3%±0. 1 dgts
ft / min ( feet per minute ) 0 ~ 8 8 0 0 19 157 ±3%±1 0dgts
knots ( nautical miles / hour ) 0 ~ 8 8 0 . 2 1.6 ±3%±0. 1 dgts
km / hr ( km / h ) 0 ~ 1 4 0 0.3 2.9 ±3%±0. 1 dgts
mph ( miles / hour ) 0 ~ 1 0 0 0.7 1.8 ±3%±0. 1 dgts
Air temperature measurement error
unit Measuring range Resolution Accuracy
-1 0℃~50℃ 0.2 ±0.2℃
°F 14°F~ 122°F 0.36 ±3.6°F

 

Communication interface

Interface definition
red DC power input (3.6 ~ 5V) 
green RXD
white TXD
black GND

 

Product specifications

Product Size 66 * 29.5 * 178mm
product weight 83.7g
Operating temperature 0℃~ 5 0℃(3 2°F ~1 2 2°F)
Storage temperature - 2 0℃6 0℃( - 4°F 1 4 0°F)

 

 

 

Product Information
Datasheet Product Brochure
Manual คู่มือ เครื่องมือวัด
BENETECH Catalog คู่มือ เครื่องมือวัด

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