Power on/off radio on EM7565

IoT Modules MC/EM Series
1

Hi,

Is there any AT command to power on/off the radio of the EM7565 module.

Thanks,

Thomas

2

how about AT+CFUN command?

3

Yes you’re right, sorry for my stupid question.

AT+CFUN AT command  sets the level of functionality in the MT. Level "full functionality" is where the highest level of power is drawn. "Minimum functionality" is where minimum power is drawn.
Possible values are,
0 minimum functionality
1 full functionality
2 disable phone transmit RF circuits only
3 disable phone receive RF circuits only
4 disable phone both transmit and receive RF circuits
4

@trichard,

I have been going through everything and no I do not believe there is a command to power the unit off, only to reset it or put it into different power modes.

Regards

Matt

5

@mlw,

The AirPrime EM75XX AT Command Ref indicates that the EM7565 has partial support for +CFUN with only 3 of the 3GPP options supported:
0 = low power, minimum function
1 = full power, full function
2 = disable RF TX (not supported?)
3 = disable RF RX (not supported?)
4 = disable RF TX + RX

However, at runtime the AT+CFUN=? shows other power modes 5-7 supported:
AT+CFUN=?
+CFUN: (0-1,4-7),(0-1)
OK

Are the other modes available to users? Might one of them be “disable TX-only”? We are hoping to use the module to wake up our system from low power mode upon receipt of an SMS message.

thanks,

grace

6

@gracette,

I suspect the additional modes are for internal use only but I have asked.

Regards

Matt

7

@gracette,

The modes are as follows.
5 = FTM – not intended for customer use, except for RF measurements as stated in the PTS
6 = RESET – This is the same as AT+CFUN=1,1
7 = OFFLINE – This is essentially never used as you have to reset the module after going into this state.

We are going to clean the documentation up but none of them do what you want.

Regards

Matt

8

Hi @gracette,

The Mobile-Terminated SMS procedure is still a bi-directional interaction between the modem and the network, so the intent to disable TX and wait for incoming SMS would be unlikely to help here, even if supported with the CFUN command. The modem will also need to periodically send messages to the network to maintain it’s status with the network, like Tracking Area Updates in LTE coverage (different messages for different types of coverage, but always something). If the modem were to stop sending these periodic messages, the network would hold back the SMS until the modem re-registered.

In general the module should always be as “quiet” as possible in the TX path. Depending on the platform, sometimes “chatty” applications need to be silenced to disable a lot of background data transfer. The PDP context (data connection) can be disabled to prevent that data chatter, if only waiting for an SMS.

Cheers,
Ryan