How to use ttyAT on mangOH yellow?

Hi

I have some question when I used mangOH+wp7607 (system information as below)

I tried to use /dev/ttyAT with microcom , but have some error messages when I send “microcom -E /dev/ttyAT” as below:

invalid number ‘/dev/ttyAT’
image

How to use ttyAT on mangOH yellow? and cloud I used ppp to dial without any API (e.g. cm data connect)?

tks.

how about “microcom /dev/ttyAT”?

do you have a USB connected to the USB AT port of WP module for PPP dial up?