The difference between AF and AT units

Are you talking about the camera?

1. AF, the abbreviation of auto focus, automatic focus, means this.

AT commands play an important role in contemporary mobile phone communications. They can control many behaviors of mobile phones through AT commands, including dialing numbers, key control, fax, GPRS, etc.

II , AT command usage

1. Test Command (Test Command)

Add "=?" after the AT command to form a test command. For example, "AT+CSCS=?" will list all supported character sets.

2. Read Command (Read Command)

Add "?" after the AT command to form a read command. For example "AT+CSCS?" will list the current settings.

3. Execute Command Generally speaking, just add "=" and command parameters after the AT command. Some commands, such as the AT+CMGR command, have no parameters and can be executed directly.