1.What is the AT command？

AT command is used for controlling module. You can use AT command to configure and query the settings.

 

2.How to use the AT command?

For USR device is in transparent mode normally, you must enter AT command mode at first. Then you can send AT command to configure or query the settings. After you configure the USR device, you should restart the USR device to make the settings take effect. Every time module restart will work in work mode rather AT command mode. Every AT command must add character carriage return and line feed . In Hex, is 0x0D is 0x0A.

 

3.How to enter AT command mode?

Please read this FAQ about entering AT command mode.

https://www.usriot.com/enter-serial-command-mode/

 

3.AT command set

Command	Function
E	Query/Set AT command echo
Z	Restart the USR device
VER	Query firmware version
ENTM	Exit serial AT command mode and enter work mode
MAC	Query MAC address
RELD	Restore factory settings
WANN	Query/Set WAN port parameters
DNS	Query/Set DNS address
WEBU	Query/Set settings web server username and password
WEBPORT	Query/Set settings web server port number
SEARCH	Query/Set search port and keyword in LAN
PLANG	Query/Set default language of` web server
UART1	Query/Set serial port parameters
UARTTL1	Query/Set serial package time and length
SOCKA1	Query/Set socket A parameters
SOCKB1	Query/Set socket B parameters
SOCKLKA1	Query socket A connection status
SOCKLKB1	Query socket B connection status
WEBSOCKPORT1	Query/Set serial port websocket port number
REGEN1	Query/Set serial port identity packet enable/disable
REGTCP1	Query/Set serial port Sending Method of identity packet
REGUSR1	Query/Set serial port User's identity packet data
REGCLOUD1	Query/Set serial port USR Cloud ID and password
HTPTP1	Query/Set serial port https method
HTPURL1	Query/Set serial port URL
HTPHEAD1	Query/Set serial port https header
HTPCHD1	Query/Set serial port filtering https header of response data enabled/ disabled
HEARTEN1	Query/Set serial port heartbeat packet enabled/disabled
HEARTTP1	Query/Set serial port type of heartbeat packet
HEARTDT1	Query/Set serial port user’s heartbeat packet data
HEARTTM1	Query/Set serial port heartbeat packet interval time