USR IOT USR-DR502-E, Руководство пользователя

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USR-DR502-E User Manual Technical Support:
h.usriot.com
Jinan USR IOT Technology Limited www.pusr.com
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6.12. Timeout Restart
USR-DR502-E supports timeout restart function, defaults to be enabled, 1800s. When there is no data in
30min, the device will restart automatically. You can change it via AT command: AT+RSTIM.
7. AT Commands
AT command is used for controlling modem, for USR devices in transparent mode normally, you must enter
AT command mode at first, then you can send AT commands to configure or query the parameter settings.
After setting all parameters, restart the modem to make the settings take effect. Every time the modem
restart will work in work mode rather AT command mode.
Every AT command must add character carriage return <CR> and line feed <LF>. In Hex, <CR> is 0x0D
<LF> is 0x0A.
For detailed AT commands, please check the AT commands set.
7.1. AT Command Settings

Enter AT command mode:
1. Send “+++” from the serial port, it will be a “a” returned.
2. Do not send any data within a serial port packaging interval before sending "+++".
3. After receiving “a”, send another “a” within 3s.
4. Receiving “+ok” means the device has changed to AT command mode.
5. Then can send AT commands to the device.

Exit AT command mode:
1. Send “AT+ENTM” from the serial port.
2. Receiving “+ok” means the device has exited AT command mode.