Problem with CM7700

Legacy Legacy AirPrime modules
1

Hi,

I’m trying to get LTE connection with a CM7700 (initially on a Raspberry Pi, and I actually try on my Windows 10 computer).
The CM7700 is pluged into a base Hat LTE for raspberry which works on USB.

Currently, I’ve entered my pin code, and now there is “No service” message on Skylight application.
The APN is set correctly (Orange France, APN : orange, username : orange, password : orange)

I don’t understand why it doesn’t work, and how to make it to work…

Is someone can help me ? :confused:

(sry for bad english…)

2

Can you check the following AT command?

Ati3
AT!GSTATUS?
AT+cpin?
at+cgdcont?

3

Sure, there is the result :

ATI3
Manufacturer: Sierra Wireless, Incorporated
Model: MC7700
Revision: SWI9200X_03.05.29.03ap r6485 CNSHZ-ED-XP0031 2014/12/02 17:53:15
IMEI: 01XXXXXXXX88
IMEI SV: 23
FSN: CDC0554049110
3GPP Release 8
+GCAP: +CGSM,+FCLASS,+DS

AT!GSTATUS?
!GSTATUS:
Current Time:  1095             Temperature: 22
Bootup Time:   1                Mode:        LOW POWER MODE
System mode:   Unknown          PS state:    Not attached
GMM (PS) state:NULL             ---
MM (CS) state: NULL             ---

Even on my Raspberry with qmicli command, modem seems to be always in Low Power Mode …

AT+CPIN?
+CPIN: READY

AT+CGDCONT?
+CGDCONT: 1,"IP","","0.0.0.0",0,0
+CGDCONT: 2,"IP","wap.cingular","0.0.0.0",0,0
+CGDCONT: 3,"IPV4V6","10767.mcs","0.0.0.0",0,0
+CGDCONT: 16,"IPV4V6","BroadbandAuto.APN","0.0.0.0",0,0
4

you need to power on the modem by “AT+CFUN=1”
BTW, is the APN correct in +CGDCONT?

5

When I sent “AT+CFUN=1”
I got a “ERROR”.

No, the APN isn’t correct in AT+CGDCONT?
While I did set the APN in Skylight and in the Windows settings.

6

how about this?

AT!ENTERCND="A710"
AT!PCINFO?
AT+CMEE=1
AT+CFUN=1
7 
AT!ENTERCND="A710"
OK

AT!PCINFO?
State: 0 (LPM)
LPM force flags - W_DISABLE:0, User:0, Temp:0, Volt:1, Auth:0
W_DISABLE: 0
Poweroff mode: 1
LPM Persistent: 0

OK

AT+CMEE=1
OK

AT+CFUN=1
ERROR
8

it shows voltage problem

image

Not sure if AT!PCVOLTLIMITS can help to overcome this problem, you can double check

9

AT!PCVOLTLIMITS also result to “ERROR”…
The PCI-E adapter is powered directly on USB by my computer.
Even when it’s powered on USB by the Raspberry, the same problem appear (stuck on Low Power Mode)

Do you know if I do something bad ?

10

what did you see for “AT!PCVOLTLIMIOTS?”

image
image638×520 66.4 KB

11

It also return ERROR … :confused:

12

then maybe the adaptor has voltage problem

13

My bad, I’ve past the command with your typing error LIMIOTS ^^
There is the result of AT!PCVOLTLIMITS? :

HI CRIT: 3600
HI NORM: 3500
LO NORM: 3100
LO WARN: 3000
LO CRIT: 2900

14

not sure if you can adjust these values to make it work
you can give a try

15

How can I do that ?
I’m newbie in modem & first time I work with AT commands,
We’re normally developer but we’re helping our customer to make its project work…

16

you might need to see the state diagram to adjust it

image
image1331×550 64.9 KB

17

Is there a way to get actual voltage ?

18

you need to use multimeter to measure those pins

19

With the AT!PCVOLT?, I get the actual voltage :
Volt state: High Critical
Power supply voltage: 3827 mV (148 cnt)

When I try to change the voltage limit, with : AT!PCVOLTLIMITS=4000,3900,3500,3400,3300
I got error…
Do you know how I can change voltage limit ?

20

did you enter AT!ENTERCND=“A710” before entering that command?
I suggest you to change the adaptor as it seems this will damage the modem.