MC8705: only one /dev/ttyUSB* responding

IoT Modules MC/EM Series
1

Hello

I am using the MC8705 with my Linux system. I found out that I/dev/ttyUSB3 was responsding to AT commands and configured ppp for this device.
Everything is working fine.
But: The other ttys created by the system are not responding to AT commands. I need an interface to the modem to query stats.
I am using Debian Wheezy and a very current self-compiled kernel (3.10.0-rc4).

When I insert my old MC8790 I receive responses to AT commands on all ttys.

Brgds
Marcel

2

Hi,

MC8705 will enumerate 4 ports :

1)CnS port
2)DM port
3)NMEA port
4)AT port

You can query the modem using AT port only.

When you say “all ttys”, what exactly does it mean? is it the ttys of some other device or the same MC8705?

Thanks

3

Hi

Yes, my MC8705 also enumerates 4 ports (ttyUSB0-3). I am using ttyUSB3 for the ppp connection. Now i want to query ttyUSB0-2 for signal strength or short messages by using AT commands. I tried to connect to these with minicom using common baudrates but the modem is not responding.
Do I need to multiplex on the fourth port to achieve my goal?

Brgds
Marcel

4

Hello
I found the Sierra CnS Reference.
Now I know how to do.

Thanks

5

Hi

I have the same question too.
But the module I am using is MC7710.
According to 2130634 USB Driver Developers Guide Rev 5.pdf, it only support interfaces as below.
ttyUSB0 DM
ttyUSB1 NMEA
ttyUSB2 AT
ttyUSB3 NET
There is not CnS interface as yours.
Could you please give some suggestion to me for how to query something after configured ppp?

Best regards
Ricky