USR-DR13X User Manual
Figure 40. Modbus RTU to Modbus TCP
Figure 41. TCP server setting
We test this function with modbus poll and modbus slave software. In the following picture, we can see
modbus poll software can
5.3. Modbus poll function
When set modbus poll function, users can set the query command sending by the USR-DR13X, like the following
picture. After power-on and enable modbus poll function, the USR-DR13X sends Modbus-RTU query commands
to the serial device. After each command is sent, it will wait for a reply according to the polling timeout. If there is
no reply within the timeout, it will send the next query command according to the polling interval.
The modbus poll function only supports the setting of complete Modbus RTU commands, and a maximum of
5 acquisition commands can be set. Each command can have a maximum of 16 bytes. The acquisition commands
can be set through AT commands, and the command setting format is:
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