Hl7800 at+gnssnmea usb

IoT Modules HL78
1

Hi,

I am using HL7800 in USB mode and I would like to enable the NMEA output in ACM2.

I am sending this command through ACM0, but ERROR is returned:

AT+GNSSNMEA=1
ERROR

I have no problems sending AT+GNSSNMEA=4

This is the SW version info:
ATI9
HL7800.3.4.1
BHL78xx.3.4.1.0.RK_02_01_01_00_46.20190425
2019/04/25 16:01:01
IMEI-SV: 3546160902603105
Legato RTOS: 18.09.2.ALT1250.rc8 2019/04/25 07:32:10
atSwi: 14.00
UBOOT: 01.03
Apps: RKAPP_02_01_01_00_42__4c94d7fcd51692e5e4264345040d4092d8fcc024
MAC: ALT1250_02_01_01_00_42_FW
PHY: 12.50.210494
PMP: 210539
SBUB: 0
SBFW: 0
RPuK:
FPuK:
RBUB: 0
RBFW: 0

Thanks in advance.

2

Hi @gabohkiin
Please check command: AT+KUSBCOMP? to ensure your module is in usb mode.
Ex response: +KUSBCOMP: 0,0,0,0
The first number should be 1 to enable usb mode, if it is 0 please enable it using command: AT+KUSBCOMP=1. It will return +KUSBCOMP: 1,1,2,3.
The 3 parameters behind are sequentially for ACM0, ACM1 and ACM2.
Here are options for them:
0 None
1 AT
2 AT_PPP
3 NMEA
4 SFP_LOGGER
5 MAC_VIA_MAP
A reboot is required to apply new setting.
After reboot, you can use ACM0 for AT command, send AT+GNSSNMEA=1, you will see GNSS output data on ACM2.
Please refer to page 94 Airprime- HL78xx- AT commands Interface Guide - Rev10 for more details to this command.

Thanks,

3

Hi @jerdung

Thanks for you response. I sent the command you suggested (in ACM0 port) and this is the output:

AT+KUSBCOMP?

+KUSBCOMP: 1

OK

Therefore, my HL7800 is certainly in USB mode.

Looks like there is only one parameter instead of the additional 3 more you indicated. In other words I don’t have the reply of 1,2,3 parameters.

I was using rev 9.3 of the AT commands interface guide, and now I downloaded the doc rev 11 and now I see what you mean, however looks like something is different from the reply output and the documentation.

I still get back the error message indicated in my post:

AT+GNSSNMEA=1
ERROR

Also:

AT+KUSBCOMP=1,1,2,3
ERROR

:frowning_face:

Is there something else that I am missing?

Thank you and best regards

4

Hi,
It’s known issue on FW 3.4. Please update your module to 3.7 or later
The latest firmware is here: https://source.sierrawireless.com/resources/airprime/software/hl7800-firmware/hl78xx-firmware/#sthash.XgD8J7La.dpbs

Thanks,

1 Like
5

Thanks!

I upgraded firmware to latest and now it is working.

Best Regards,