USR-DR404 user manual
Jinan USR IOT Technology Limited
23
Diagram 17 HTTPD Client short connection timeout setting
AT command setting:
(1) Setting/query the Httpdclient Mode (long/short), for example:
AT+HTTPSCEN=short
(2) Setting/query the timeout of short connection mode, for example:
AT+HTTPSCT=3
3.1.4. Modbus TCP <=> modbus RTU
This serial server supports Modbus TCP to Modbus RTU (does not support Modbus ASCII); the network parameters of
the module should correspond to the network parameters of the application software. The TCP server corresponds to the
TCP client and the port must be the same. For the working mode, select Modbus TCP <=> Modbus RTU.
Diagram 18 modbus TCP <=> modbus RTU
Setting by AT command:
AT+TMODE=modbus
Setting by web page: