GM8904 / BENETECH เครื่องวัดความเร็วลม Handheld Anemometer

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BENETECH

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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Product Tags

gm8904 benetech เครื่องวัดความเร็วลม anemometer vane anemometer

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.

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)