USR-DR504-E User Manual
Jinan USR IOT Technology Limited
Tech Support: h.usriot.com
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Diagram 2.3.8.1-3 Serial Update Schematic Diagram
(4) firmware update is completed and the device is restarted.
Diagram 2.3.8.1-1 Serial update Schematic Diagram
2.3.8.2. Remote update
Remote upgrade uses polling mode to query, and the server is requested once by default for 30 minutes to get
whether there is an upgrade demand. If the upgrade is needed, the firmware data will be downloaded from the server
for the upgrade; if not, the system will sleep and wait for the next round. The polling time of Fota upgrade can be set
through AT+FOTATIME with a range of 10~65535s.