I have an HL7812 connected to USB. It represents itself as four devices, ttyACM[0-3]. I’ve not found in the documentation what each of these is used for. What data is expected on each port? Thanks,

You can see here [image] HL7802 Setup ppp connecxion over AT_PPP Legacy HL Series I see in the HL78 PTS that there is a AT_PPP port over USB, i guess is dedicated to ppp, can you give some guidelines to use this port and ppp? (HL78-Linux/Windows host)

Thank you! I’ve seen descriptions of the ttyACM[0-2] devices, but I have a fourth port that is not mentioned anywhere. My guess is that ttyACM[0-1] is for AT/Data and ttyACM2 for GPS, but I have not got it confirmed. Still no clue what ttyACM3 is for.

What is the return of AT command kusbcomp

Hi, AT+KUSBCOMP? +KUSBCOMP: 1,1,2,3 OK AT+KUSBCOMP=? +KUSBCOMP: (0-1),(0-5),(0-5),(0-5) OK So I intepret it as ttyACM0 = AT ttyACM1 = AT_PPP ttyACM2 = NMEA Even the AT commands interface guide does not mention the 4:th port. Is the ttyACM0 perhaps an USB/UART port that persist even if I …

what is your testing result on disabling USB? Actually i think you can just ignore that port, most likely you only need AT port

All ttyACM devices disappear, kind of expected :slight_smile: Anyway, It seems to be ttyACM[0-2] that I should use, I will leave ttyACM3 as an unresolved mystery. Thank you

HL7812 and ttyACM*

IoT Modules

jyijyi April 11, 2023, 2:08pm 2

You can see here

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HL7812 and ttyACM*

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