HUAWEI ME909u-521 LTE LGA Module

 

Application Guide

SMS Application Scenarios

2: Delete all read and sent messages in the preferred message storage, and keep the unread and unsent messages.

3: Delete all read, sent, and unsent messages in the preferred message storage, and keep the unread messages.

4: Delete all messages in the preferred message storage, including the unread messages.

Figure 5-8Deleting short message

Deleting short messages

Start

Example: Lists all short messages in PDU format.

Prerequisite:

SMS has been initialized.

 

 

 

 

AT+CMGL=4

 

 

 

 

+CMGL: 1,<parameters>

 

 

 

 

07919471060040

 

 

 

 

+CMGL: 2,<parameters>

 

 

 

 

07919471060040

 

 

 

 

......

 

 

Delete the message

 

Equivalent to

 

 

stored in

 

X:(0-999)

 

AT+CMGD=n

location n in the preferred

 

 

 

 

 

 

storage.

 

 

 

 

 

 

AT+CMGD=n

AT+CMGD=n,0

AT+CMGD=x,DelFlag

 

 

 

 

 

 

+CMSERROR:

 

 

 

OK

invalid memory

 

 

 

index

 

 

 

 

 

 

 

 

 

 

End

 

5.5.2Troubleshooting

 

Scenario

 

 

Possible Error

 

 

Solution

 

 

 

 

 

 

 

 

 

Information

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Error information is

 

 

 

 

 

 

 

returned in response

 

+CMS ERROR: invalid

 

 

Check the validity of the index.

 

to one of the previous

 

memory index

 

 

 

 

 

 

 

 

 

commands.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Issue 01 (2013-07-05)

Huawei Proprietary and Confidential

35

Copyright © Huawei Technologies Co., Ltd.

 

 

Page 35
Image 35
Huawei ME909u-521 manual 8Deleting short message

ME909u-521 specifications

The Huawei ME909u-521 is a cutting-edge module designed to meet the increasing demand for mobile broadband connectivity in various industrial and commercial applications. This compact and robust device is primarily used for M2M (Machine-to-Machine) communication and IoT (Internet of Things) solutions. It supports a wide range of features and technologies that make it a versatile choice for businesses looking to enhance their operational efficiency through cellular connectivity.

One of the key features of the ME909u-521 is its support for multiple frequency bands. It is compatible with 4G LTE networks, ensuring high-speed data transmission and reduced latency. This capability allows for seamless communication in various environments, making it an ideal solution for applications such as smart cities, telematics, transportation, and remote monitoring.

In addition to LTE capabilities, the ME909u-521 also supports 3G and 2G networks, providing fallback options in areas where 4G coverage may be limited. This multi-network support guarantees reliable connectivity, which is crucial for mission-critical applications. The module is designed to maintain stable connections even in challenging conditions, such as in-motion environments or areas with fluctuating signal strengths.

The Huawei ME909u-521 features a compact form factor, making it easy to integrate into a wide range of devices and applications. Its small size reduces the overall footprint, which is particularly advantageous for space-constrained installations. Furthermore, the device is equipped with advanced power management features that help optimize energy consumption, extending the lifespan of connected devices.

For enhanced security, the ME909u-521 integrates robust encryption protocols to protect data transmission over mobile networks. Security is a top priority for M2M and IoT applications, and this module ensures secure communication by adhering to global standards and best practices.

Another notable characteristic is its extensive support for various interfaces, including UART and USB, facilitating seamless integration with different hardware systems. This flexibility allows developers to quickly implement and scale their solutions based on specific project requirements.

Overall, the Huawei ME909u-521 is a powerful connectivity module that combines high-speed communication, versatility, and reliability. With its state-of-the-art technologies, it is well-suited for a wide array of applications, making it a valuable asset for businesses looking to advance their digital transformation initiatives. Whether utilized in smart grids, remote monitoring, or intelligent transportation systems, the ME909u-521 stands out as a leading solution in the M2M and IoT landscape.