UART to GPRS USR-GM3 GSM Module GPRS DTU Embedded Wireless Transparent Transmission

Name: UART to GPRS USR-GM3 GSM Module GPRS DTU Embedded Wireless Transparent Transmission
Brand: Generic
SKU: 1473604
Price: 29.79 USD
Availability: InStock

$29.79

Availability: In Stock

Shipping: Free Airmail

Estimated Delivery:

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Handling Time

Before we can ship your order, we prepare your products, do strict quality-control tests and carefully package the items. The time it takes to prepare your items for shipping is separate from the delivery time. It usually takes 1-3 business days to ship out .

Shipping Methods

You can choose the preferred shipping method on the cart page during the checkout process. We offers 3 international shipping methods:

1. Airmail – Free untracked economy shipping via national postal services (HK Post, Singapore Post, China Post, PostNL, Swiss Post, Sweden Post, USPS, Royal Mail e.t.c.)
2. Airmail Registered – Tracked shipping via national postal services (HK Post, Singapore Post, China Post, PostNL, Swiss Post, Sweden Post, USPS, Royal Mail e.t.c.)
3. Expedited Shipping – Express shipping with courier delivery (DHL, UPS, FedEx, TNT)

Delivery Time

Airmail and Airmail Registered	Area	Estimated Delivery Time
	United States, Canada	7-25 business days
	Australia, New Zealand, Singapore, United Arab Emirates	10-25 business days
	United Kingdom, France, Spain, Germany, Netherlands, Japan, Belgium, Denmark, Finland, Ireland, Norway, Portugal, Sweden, Switzerland	10-25 business days
	Italy, Brazil, Russia, South Africa	10-45 business days
	Other countries	10-35 business days
Expedited Shipping	3-10 business days to Worldwide

Note: If you choose an expedited shipping, please remember to leave a valid contact number, this is required for expedited shipping’s courier delivery.

Returns & Refund

Last updated October 05, 2022

Returns

If you are not completely satisfied with your purchase for any reason, you may return it to us for a full refund within 15 days from delivery date. All returned items must be in new and unused condition, with all original tags and labels attached.

Return Process

To return an item, please email our customer service at sales@alexnld.com to obtain a Return Merchandise Authorization (RMA) number. After receiving a RMA number, place the item securely in its original packaging, and mail your return to the following address:

Alex NLD
Attn: Returns
RMA #
HaGiborim St 8
Tiberias, 14388
Israel

Please note, you will be responsible for the return shipping charges. We strongly recommend that you use a trackable method to mail your return.

All customers should contact us and obtain Return Merchandise Authorization (RMA) number before sending anything to us. We will not be responsible for returned item(s) without notifying us in advance.

Refunds

After receiving your return and inspecting the condition of your item, we will process your refund to the credit / debit card or PayPal account which was used to place the original order.

Please allow at least seven (7) days from the receipt of your item to process your refund. Refunds may take 1-2 billing cycles to appear on your credit card statement, depending on your credit card company. We will notify you by email when your refund has been processed.

Exceptions

If an item is found damaged or defective on receipt, we kindly ask you to contact us within 15 days from the delivery date to arrange a refund or exchange without physical return of the item.

Please provide us with following:

1. Photos of the front and back sides of the packaging box;
2. A photo, video or screenshot of the defective item or the defective part of the parcel.

Our customer service team will communicate with you to arrange a refund or reshipment without physical return of the item.

Warranty & Repair service

If any of the items you have purchased from us is found defective within 1 year from receipt, you are entitled to a repair under warranty. Please kindly provide us with evidence photos or videos of the defective item. After providing such information to our Customer Service team and the problem is acknowledged, you can send the items back to us for a repair.

Note: Please be aware, we do not cover the cost of the returns fees in warranty & repair service.

Order Cancellation

If you want to cancel an order within 24 hours from confirmation of the payment, you will be entitled to a full refund. It is still possible to cancel an order after 24 hours, provided that it has not yet been shipped. If an order has been shipped, it’s impossible for us to cancel or modify it anymore. If you still want a refund, you required to return the item on it’s arrival.

Questions

If you have any questions concerning our return policy, please contact us at:

+972 054-536-2888
sales@alexnld.com

Feature:

1. GPRS module GM3 supports low power mode, users can use AT command to enter low power mode, or can turn on automatic low power mode.

2. Users can use the network AT command, external GPIO and phone text messages to wake up, which is convenient for power consumption when using battery power.

3. When the GPRS module GM3 is used as the TCP CLIENT, after the TCP successfully establishes the link, it automatically sends a predetermined registration packet for the TCP server to identify the TCP.

4. The registration packet data can be an IMEI code, an ICCID code, and custom registration data.

5. GPRS module GM3 In the network transparent transmission mode, the user can choose to let the module send the heartbeat packet. The heartbeat packet can be sent to the network server or sent to the serial device.

6. The network heartbeat packet is continuously sent to maintain the normal connection between the module and the server.

7. The serial heartbeat packet is suitable for sensors that cannot actively push data to the server to actively capture sensor data.

8. LBS base station positioning can obtain the location information of the GPRS module GM3 through the network of the telecom mobile operator, conveniently querying the location of the GM3, and making up for the GPS positioning affected by weather, high buildings, locations, and the like.

9. GPRS module GM3 supports the second network link, which is suitable for users who need to send data to two servers for data backup and remote abnormal diagnosis.

The GPRS module GM3 mainly has four working modes: network transparent transmission mode, HTTPD Client, SMS transparent transmission mode, and AT command mode.

1. Network transparent mode:

In this mode, the user's serial device can send data to the specified server through the GPRS module GM3. GM3 supports two-way socket links, namely socket A and socket B. The two links are independent of each other. The following is a detailed introduction.

2. HTTPD Client mode

This mode passes data directly to the HTTP server or from the HTTP server. As long as the data is sent to the serial port according to the format, the data will be directly submitted to the web server (such as apache, IIS, tomcat, etc.) by Http (GET/POST). The website programmer can directly use the script language such as PHP and ASP to do the database storage. Wait for processing. The best choice for a B/S architecture system!

3. SMS transparent transmission mode

In the SMS transparent transmission mode, the user's serial device can send a text message to the specified mobile phone, or forward the information received by the mobile phone to the serial device. Transparent data communication between the mobile phone and the serial device can be realized with simple parameter setting.

4. AT command mode

The GPRS module GM3 supports serial AT commands, short message AT commands, and network AT commands.

Serial AT command: It means that the GSM module works in transparent transmission mode, no need to switch to the command mode, use the password plus AT command to set and query the parameters.

Network AT command: refers to the GSM module works in transparent transmission mode, through the network to send passwords and AT commands to set and query parameters.

SMS AT command: refers to the method of setting and querying the GPRS module by means of remote short message.

Feature:

Item		Description
Name	USR-GM3	GPRS module
Network	Standard	GSM / GPRS
	Rate	14.4 Kbps ~ 57.6 Kbps
	Standard frequency band	850/900/1800/1900MHz quad-band
	GPRS Multi-slot Class	GPRS Class 10
	GPRS Terminal Device Class	Class B
	GPRS Coding Schemes	CS1 ~ CS4
	Transmit power	GSM900 class4 (2W), DCS1800 class1 (1W)
	Application method	GSM standard AT command set / Someone extended AT command set / Data transmission / Short message transmission / HTTPD
	Network protocol	TCP, UDP, DNS, Httpd client
	Network cache	Send: 4K bytes, receive: 4K bytes
Serial port	Number of ports	1
	Interface standard	TTL serial port: SMD type 2.8 ~ 3.6 V
	Data bit	7,8
	Stop bit	1,2
	Check Digit	None, Even, Odd
	Baud rate	2400 bps ~921600bps
	Flow Control	CTS/RTS
	Cache	Send and receive 4K bytes each
Device	SIM card	1.8V / 3V
Device	Voice interface	1 way MIC input, 1 way SPEAK output
Software	Virtual serial port (USR-VCOM)	Windows 2000 or higher (32 bit / 64 bit)
Software	Configuration method	Host computer setting software, serial command, SMS com mand, network com mand
Basic parameters	Size	27.94 x 24 x 3 (mm)
	Operating temperature	-25 ~ 85°C
	Save environment	-40 ~ 125°C, 5 ~ 95% RH (no condensation)
	Input voltage	DC 3.4 ~ 4.2 V, recommended: 3.8V
	Working current	Average: 55 ~ 90mA, maximum: 750mA
More	Safety certification	CE FCC ROHS WEEE
More	Accessories	PCB antenna (not includes)