USR-DR404 user manual
Jinan USR IOT Technology Limited
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WIFI serial server returns to mobile phone (hexadecimal number): FF 00 03 82 01 01 87
Explanation: The mobile phone sends a setting command to the WIFI serial server, sets the SSID to "TEST1" and the
password to "123456". The information returned by the WIFI serial server to the mobile phone is:
There is a network with SSID "TEST1" and the password format is correct.
3.7. USR Cloud
USR Cloud includes Scada cloud and cloud monitor.
If your serial device supports standard MODBUS RTU data, the cloud platform can display serial device data by
establishing a TCP connection with the DR404.
USR Cloud address:
After registering an account, log in.
USR Cloud server address is: tcp.mp.usriot.com, port 15000. The device number is 20 digits and the communication
password is up to 8 digits.
3.8. Heartbeat Packet Function
In the network transparent transmission mode, the user can choose to enable the custom heartbeat packet function.
The heartbeat packet can be sent to the network or serial device:
Diagram 25 Heartbeat packet
The main purpose of sending to the network is to maintain a connection with the server, and at the same time let
the server that is idle for a long time (do not send data to the server for a long time) to detect whether the current
connection status is valid.