Port usb EC 20 CE

I found a problem when the AT port was detected then 1 minute disappeared like the picture, can you provide the type of converter directly from the usb pin D-D +. im use port P1,

now i use a usb to ttl converter but it doesn’t work well, can you provide a type of converter that supports EC2 20 CE,

note: USB driver already installed
Thank you


It’s hardware issuse, but not driver.

Next, I will send the hardware schematic that I use, is there a problem here?? you can check

GSM_SIM5320.pdf (244.1 KB)

@fuguiwang-Q Please help check it.