[Hilo] What’s DCD signal behavior of Hilo?

Answer: Here’s the Hilo DCD signal behavior:
When module is in data mode, the DCD will be active (Whatever AT+KLSEEP=0/1/2);
When module is in command mode, the DCD will be inactive. (Whenever using +++, DTR drop, or any disconnection)
The way to let module in data mode: CSD call, SMS, TCP, UDP, FTP, HTTP, SMTP/POP3 and KFSFILE
The behavior is same for MUX or None-MUX mode.