EM7355 Radio off, no service


#1

Hi all,

I have the EM7355 and cannot get it to work, however, it was working before :confused:

Any help is greatly appreciated :slight_smile:

netsh mbn sh int

There is 1 interface on the system:

Name                   : Mobile
Description            : Sierra Wireless Mobile Broadband Network Adapter
GUID                   : {1A4FE44B-0C5A-4B90-8C14-24FE8ECF7BE2}
Physical Address       : 00:a0:c6:00:00:17
Additional PDP Context : No (Physical interface)
Parent Interface Guid  : No parent
State                  : Not connected
Device type            : Mobile Broadband device is embedded in the system
Cellular class         : GSM
Device Id              : 356196050323043
Manufacturer           : Sierra Wireless, Incorporated
Model                  : EM7355
Firmware Version       : SWI9X15C_05.05.58.00 9902196 01
Provider Name          :
Roaming                : Not roaming
Signal                 : 0%
RSSI / RSCP            : 0 (-113 dBm)

netsh mbn sh read int=*

Ready information for interface Mobile:

State            : Ready to power up and register
Emergency mode   : Off
Subscriber Id    :************************
SIM ICC Id       :************************
Number of telephone numbers  : 0

netsh mbn sh rad int=*

Radio state information for interface Mobile:

Hardware radio state      : Off
Software radio state      : On

netsh mbn sh cap int=*

Device capability information for interface Mobile:

Device type                  : Mobile Broadband device is embedded in the system
Cellular class               : GSM
Voice class                  : No voice
Sim class                    : SIM is removable
Data class                   : GPRS, EDGE, UMTS, HSDPA, HSUPA, LTE, HSPA+
GSM band class               : Unknown
SMS capability               : PDU receive, PDU send
Control capability           : Manual network selection is allowed
                               Hardware radio switch functionality available
Device Id                    : 356196050323043
Manufacturer                 : Sierra Wireless, Incorporated
Model                        : EM7355
Firmware Information         : SWI9X15C_05.05.58.00 9902196 01
Maximum activation contexts  : 1

netsh mbn sh vis int=*

Scanning for available networks. Device can take few minutes to complete this operation
Failed to scan on the given interface to get available networks : error 0xc0040015.

netsh mbn sh read int=*

Ready information for interface Mobile:

State            : Ready to power up and register
Emergency mode   : Off
Subscriber Id     :************************
SIM ICC Id       :************************
Number of telephone numbers  : 0

#2

@chomudda,

Where are you getting all of the above, do you have access to AT commands?

Regards

Matt


#3

@mlw Yes I do have AT commands, this is from CMD


#4

@chomudda,

In which case can you send the following to the unit.

ati
at!gstatus?
at+cpin?
at+creg?
at+cgreg?
at!pcinfo?

Regards

Matt


#5

Hi @mlw,

Thank you so much for the reply. I’ve accidentally issued the command AT!UDUSBCOMP=9 and now I cannot access AT commands :frowning:


#6

@chomudda,

So you are going to need to push back into your commercial channel to try get hold of an executable to get it back as I am not sure there is going to be anyway to determine what is going on or to recover it purely through the MBIM interface alone.

Regards

Matt


#7

Can you please point me in the right direction, I just want to get AT commands back :frowning: what do you mean push back?


#8

@chomudda,

So because you have set the unit into a mode where the AT commands are no longer accessible you can no longer send AT commands to either recover the unit or get information about it. You need a windows application that uses MBIM (which is the only interface you have set) to be able to do this, a chicken and egg situation.

What I mean by push back is that you will have bought the unit from someone, assuming they are an official distributor, they will have a support path into Sierra to see if there is such an application to recover the unit.

Regards

Matt


#9

@chomudda,

Ok so I have dug out the application that will allow you to switch back to RMNet mode.

MC73xSwithBackUSBcompFromMBIMToRMNET_AT.zip (1.2 MB)

Regards

Matt


#10

Looked like the module was in Low Power Mode. Check to see if there is a Wireless Switch either on the side of your laptop or a combination of Fn with Function keys.


#11

@mlw thank you so much! I will try it when i get home

@tomato I have tried that, however, it used to work when I cycled airplane mode. Now it won’t do anything, just says its switched off. Is there a way to force low power mode off?


#12

Do you have the driver package from your laptop vendor? You can add “USBCOMP=8” in configuration.ini file without quotation marks and re-install the driver package again. That will enable the AT port then you can issue AT+CFUN=1 to get out of LPM.


#13

@tomato I don’t unfortunately, I tried to follow the steps here to no avail :frowning:


#14

Awesome I just used a random vendor of the device, downloaded the drivers from GETAC and changed the configuration.ini file, works like a charm :slight_smile: thank you @tomato @mlw


#15

@mlw here are my AT command results

ati

Manufacturer: Sierra Wireless, Incorporated
Model: EM7355
Revision: SWI9X15C_05.05.67.00 r31378 CARMD-EV-FRMWR1 2016/03/11 14:58:53
MEID: 35619605032304
ESN: 12812231706, 80BAA41A
IMEI: 356196050323043
IMEI SV: 21
FSN: FD416202550411
+GCAP: +CGSM

OK
at!gstatus?

!GSTATUS:
Current Time: 524 Temperature: 29
Bootup Time: 5 Mode: LOW POWER MODE
System mode: Unknown PS state: Not attached

OK
at+cpin?

+CPIN: READY

OK
at+creg?

+CREG: 0,0

OK
at+cgreg?

+CGREG: 0,0

OK
at!pcinfo?

State: LowPowerMode
LPM force flags - W_DISABLE:1, User:0, Temp:0, Volt:0, BIOS:0, GOBIIM:0
W_DISABLE: 1
Poweroff mode: 0
LPM Persistent: 0

OK


#16

@chomudda,

So there is a W_DISABLE line on the system connector and you have this held so that it turns the radio off, you cannot override this in firmware you have to change the hardware state of the line.

Regards

Matt


#17

Hi Matt,

Ohh I see, however, I just set AT!PCOFFEN=2 and it ignores low power mode.

0 = Modem will enter LPM (low power mode) when W_DISABLE is asserted.
2 = Ignore changes on W_DISABLE.

Page 52 of the AT commands manual.

Thank you so much for your help @mlw , everything is now working on my Lenovo X1 Carbon 6th gen :slight_smile:


#18

@chomudda,

Good point, forgot about that, glad it is working.

Regards

Matt