Reset from at+cpsms command on HL7802

IoT Modules HL78
1

Hi,

I’ve recently changed to the HL7802 modem (from the HL7800) and after giving the command AT+CPSMS=0 (shortly after power on) the modem seems to reset itself. That never happened with HL7800 running 4.6.9.4 (i’ve never encountered that).

aattee00


OK
at+cpsms=0

OK

+KSUP: 0

+SIM: 0

Is this normal behaviour? Firmware is the latest 4.6.9.4.

Also, the modem seems to be rebooting on its own:

+KSUP: 0

+SIM: 0
aattee00

OK

+KSUP: 0

+SIM: 0

+KSUP: 0

+SIM: 0

+KSUP: 0

+SIM: 0

+KSUP: 0

+SIM: 0

+KSUP: 0

+SIM: 0

+KSUP: 0

+SIM: 0

+KSUP: 0

+SIM: 0
aattee00

ERROR
aattee00

OK

+KSUP: 0

+SIM: 0

+KSUP: 0

+SIM: 0

thanks

2

Hi hkiol,

I can not reproduce this issue on my HL7802 FW 4.6.9.4.
HL7802_CPSMS.txt (1020 Bytes)

How many devices did you observe this issue? If It’s just only one, could you please retry on another device?

1 Like
3

This is happening on all modems that I am testing (3 for now).

Just to be clear, after power up I am giving AT+CPSMS=0 and the modem resets.

But the modem also resets on its own if I leave it on for an extended amount of time and don’t communicate with it.

Also, do I have to give the command AT+CPSMS=0 at all if I don’t plan to use PSM? Is it 0 by default?
I am asking so that I disable PSM from my application for the time being until I figure out this issue.

thanks

4

Hi hkiol ,

Yes, it is. AT+CPSMS=0 is to disable the use of PSM. It is 0 by default.

Are you able to reproduce the issue 100% on all HL7802 modules?
What is the output of folling command?
AT+KSLEEP?
AT+CFUN?
AT+CEDRXS
You can try disabling sleep mode, eDRX, and resetting the module
AT+KSLEEP=2
AT+CEDRXS=0
AT+CFUN=1,1

1 Like
5

Hi Donald,

Thanks for the reply again.

Here’s the commands you listed:

at+cgmr

HL7802.4.6.9.4

OK
AT+KSLEEP?

+KSLEEP: 2

OK
AT+CFUN?

+CFUN: 1

OK
AT+CEDRXS

ERROR
AT+CEDRXS

ERROR
AT+CEDRXS?

OK

Also, POWER_ON_N pin is connected to an open-drain pin of the microcontroller which is floating when the modem is ON.

WAKEUP pin is tied to VGPIO as I am not using PSM at the moment.

the reset pin is connected to an open-drain pin of the microcontroller which is floating when the modem is ON.

Are you able to reproduce the issue 100% on all HL7802 modules?

I’m still getting the reset after AT+CPSMS=0 on every module that I’ve tried.

I was initially using this command to switch from PSM to normal operation. I found that using the WAKEUP pin was not enough.

thanks

6

Mind you, I am configuring the modem with KSRAT=1.
Mine:

MAC: ALT1250_02_01_02_00_111_NB

Yours:

MAC: ALT1250_02_01_02_00_123_2G

I think your modem is on 2G.

edit: modem resets after AT+CPSMS=0 even on KSRAT:2

cpsms_log.txt (601 Bytes)

7

On another note, I believe the modem is resetting by itself because of some sort of a timer timeout.

When for example the modem can’t find signal for a while, it is internally reset.

Or when it is connected to a carrier and the modem is not using its connection maybe the carrier drops the connection forcing the modem to reset?

thanks

8

Hi hkiol,

No, the HL7802 module does not have this feature. Please try to re-flash the HL7802 firmware or downgrade the firmware to the previous version 4.6.8.0 and recheck.
HL78xx (HL7800/HL7800-M/HL7802) Firmware