Unable to get RSSI value in AT+CSQ

IoT Modules LTE Standard Module
1

Hi
I am using EC25-A FA modem present on Shiratech( Shiratech LTE Mezzanine - 96Boards) inserted “Vodafone 4G” sim card (APN:portalnmms).
We have 2 flex antennas connected from Pulse Electronics.

AT command output as below:
AT+CPIN?
+CPIN: READY

OK
AT+QGMR
EC25AFAR05A04M4G

OK
AT+CPAS
+CPAS: 0

OK
AT+CFUN?
+CFUN: 0

OK
AT+COPS?
+COPS: 0

OK
AT+QCFG=“band”
+QCFG: “band”,0x260,0x80a,0x0

OK
AT+QCFG=“nwscanseq”
+QCFG: “nwscanseq”,0102030405

OK
AT+QCFG=“nwscanmode”
+QCFG: “nwscanmode”,3

OK
AT+CGDCONT?
+CGDCONT: 1,“IP”,“portalnmms”,“0.0.0.0”,0,0,0,0
+CGDCONT: 2,“IPV4V6”,“ims”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
+CGDCONT: 3,“IPV4V6”,“sos”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,1

OK
AT+CREG?
+CREG: 2,0

OK
AT+CSQ
+CSQ: 99,99

OK
AT+QCSQ
+QCSQ: “NOSERVICE”

OK
AT+QNWINFO
+QNWINFO: No Service

OK
AT+CGATT?
+CGATT: 0

OK
AT+QCFG=“usbnet”
+QCFG: “usbnet”,0

OK
AT+GMR
EC25AFAR05A04M4G

I have also checked with quectel-CM utility:
root@raam:~# quectelcm -s portalnmms
[ main.c-0714: 04-29_17:40:36:888] Quectel_QConnectManager_Linux_V1.5
[ device.c-0144: 04-29_17:40:36:889] Find /sys/bus/usb/devices/1-1.2 idVendor=0x2c7c idProduct=0x125
[ device.c-0194: 04-29_17:40:36:889] Auto find qmichannel = /dev/cdc-wdm0
[ device.c-0195: 04-29_17:40:36:889] Auto find usbnet_adapter = wwan0
[ main.c-0834: 04-29_17:40:36:889] Modem works in QMI mode
[ QmiWwanCM.c-0282: 04-29_17:40:36:896] cdc_wdm_fd = 7
[ QmiWwanCM.c-0134: 04-29_17:40:36:977] Get clientWDS = 19
[ QmiWwanCM.c-0135: 04-29_17:40:37:009] Get clientDMS = 1
[ QmiWwanCM.c-0136: 04-29_17:40:37:042] Get clientNAS = 3
[ QmiWwanCM.c-0140: 04-29_17:40:37:074] Get clientUIM = 1
[ QmiWwanCM.c-0141: 04-29_17:40:37:105] Get clientWDA = 1
[ QMIThread.c-1957: 04-29_17:40:37:137] requestBaseBandVersion EC25AFAR05A04M4G
[ QMIThread.c-0893: 04-29_17:40:37:266] requestGetSIMStatus SIMStatus: SIM_READY
[ QMIThread.c-1877: 04-29_17:40:37:266] requestSetProfile[1] portalnmms///0
[ QMIThread.c-1931: 04-29_17:40:37:329] requestGetProfile[1] portalnmms///0
[ QMIThread.c-1563: 04-29_17:40:37:361] requestRegistrationState2 MCC: 0, MNC: 0, PS: Detached, DataCap: UNKNOW
[ QMIThread.c-1698: 04-29_17:40:37:395] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[ udhcpc.c-0014: 04-29_17:40:37:395] ifconfig wwan0 down
[ udhcpc.c-0014: 04-29_17:40:37:407] ifconfig wwan0 0.0.0.0

I am not getting value of RSSI signal in AT command and also no value for MCC, MNC in quectel-cm.

Someone please help me with command to debug further as I don’t get any further help from manual.

Thanks,
Trignesh

2

Your modem is in Airplane Mode. Turn the radio on with AT+CFUN=1

3

Hi snowgum,

I have followed command set for full function on (CFUN=1) and getting PB & SMS status Done too, but no effect on RSSI value.
+QODM: “DME”,0,DM Start
ATE1
OK
AT+cmee=2
OK
AT+CPIN?
+CPIN: READY

OK
AT+CFUN?
+CFUN: 0

OK
AT+CFUN=1
OK

+QIND: SMS DONE
AT+QINISTAT
+QINISTAT: 7

OK
AT+QCCID
+QCCID: 89910273202028819353

OK
AT+CIMI
404242305621696

OK
AT+COPS?
+COPS: 0

OK
AT+CREG?
+CREG: 0,0

OK
AT+CREG=1
OK
AT+QNWINFO
+QNWINFO: No Service

OK
AT+CSQ
+CSQ: 99,99

4

You don’t seem to have any signal. Have you got an antenna connected?

Does the network scan command AT+COPS=? return anything? That command can take a minute or more to return a result.

5

Hi Snowgum,

Can I use EC25-A in India region?

I have connected LTE Antenna from “Pulse Electronics” which comes with module.
I am using “SRT-96B-MEZ-LTE-A” .

AT+QINDCFG=“act”?
+QINDCFG: “act”,1

OK
AT+QINDCFG=“all”,1
OK
AT+QINDCFG=“ring”,1,1
OK
AT+COPS?
+COPS: 2

Thanks for quick response

6

Not for LTE/4G according to what I’ve read.

The EC25-A is for North America.

The EC25-A spec lists its supported LTE bands as B2, B4 and B12.

As far as I can see, India uses B1, B3, B5, B8, B40 and B41 for LTE.

7

Hi,

I’m certain that you will only get a meaningful RSSI result when you are registered on a cell.