Figure 51. Add whitelist rules
7. DTU Function
USR-G816 comes with 1*RS232/485 serial port, through simple settings, the serial device can be connected to
the network and achieve data communication with the remote server. There are 3 work mode for DTU function:
NET, HTTPD, MODBUS.
➢ NET: In this mode, the user does not need to pay attention to the data conversion process between
the serial port and the network and can realize the data transparent communication between the
serial port device and the designated network server.
➢ HTTPD: In this mode, data communication between the serial device and the HTTP server can be
realized. USR-G816 can pack the data from serial device into HTTP format and send it to HTTP server,
or parse the data returned by server and send it to the serial device.
➢ MODBUS: In this mode, USR-G816 can realize Modbus RTU/TCP conversion between the serial port
device and the designated network server.
Note: In NET and MODBUS mode, SOCKA, B, C, D can be used, but the HTTPD mode cannot be used at the
same time.
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