[WP7607] Full UART(8-wire) asynchronous interface with UART1

In the specification of the WP76 series module, they are supported full UART(8-wire) function in UART1(not USB).

I have tried it, but flow control is NOT working. Expected it cannot communicate without CTS/RTS connection.
Except for CTS/ RTS, there still have DSR, DCD also no function.

How do I config the WP76 module with full UART(UART1) function like modem operation?

If the module can’t set to full UART, that means it can’t implement to modem application.