EP06-E not detecting SIM card

Hello team!

I’m cross-posting here from Sixfab’s forum [link] to get some assistance with this issue on my IoT project…

Long story short: My EP06-E is unable to detect the SIM card inserted in my Sixfab LTE HAT

Simply followed Sixfab’s guide to get Internet connectivity here: QMI Interface Internet Connection Setup Using Sixfab Shield/HAT | docs.sixfab.com

Except that after running the ./quectel-CM script to get the interface up, the log shows requestGetSIMStatus SIMStatus: SIM_ABSENT.

root@raspberrypi:/home/pi/files/quectel-CM# ./quectel-CM -s internet.emt.ee
[07-13_17:27:43:124] Quectel_QConnectManager_Linux_V1.6.0.12
[07-13_17:27:43:126] Find /sys/bus/usb/devices/1-1.1 idVendor=0x2c7c idProduct=0x306, bus=0x001, dev=0x003
[07-13_17:27:43:126] Auto find qmichannel = /dev/cdc-wdm0
[07-13_17:27:43:126] Auto find usbnet_adapter = wwan0
[07-13_17:27:43:126] netcard driver = qmi_wwan, driver version = 5.10.17-v7l+
[07-13_17:27:43:127] ioctl(0x89f3, qmap_settings) failed: Operation not supported, rc=-1
[07-13_17:27:43:127] Modem works in QMI mode
[07-13_17:27:43:146] cdc_wdm_fd = 7
[07-13_17:27:43:468] Get clientWDS = 20
[07-13_17:27:43:532] Get clientDMS = 1
[07-13_17:27:43:596] Get clientNAS = 2
[07-13_17:27:43:660] Get clientUIM = 2
[07-13_17:27:43:724] Get clientWDA = 1
[07-13_17:27:43:788] requestBaseBandVersion EP06ELAR03A06M4G
[07-13_17:27:44:044] requestGetSIMStatus SIMStatus: SIM_ABSENT
[07-13_17:27:44:044] requestSetProfile[1] internet.emt.ee///0
[07-13_17:27:44:174] requestGetProfile[1] internet.emt.ee///0
[07-13_17:27:44:236] requestRegistrationState2 MCC: 248, MNC: 1, PS: Detached, DataCap: UNKNOW
[07-13_17:27:44:300] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[07-13_17:27:44:300] ifconfig wwan0 down
[07-13_17:27:44:316] ifconfig wwan0
^C[07-13_17:27:53:421] QmiWwanThread exit
[07-13_17:27:53:422] qmi_main exit

And AT+CPIN? is also saying that the SIM card is missing, returning +CME ERROR: 10:

root@raspberrypi:~# dmesg | grep tty
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=HDMI-A-1:1920x1080M@60 smsc95xx.macaddr=DC:A6:32:A3:A7:B0 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  console=ttyS0,115200 console=tty1 root=PARTUUID=9730496b-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
[    0.001835] printk: console [tty1] enabled
[    1.669996] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 36, base_baud = 0) is a PL011 rev2
[    5.504293] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
[    5.511920] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
[    5.519929] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
[    5.533264] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3

root@raspberrypi:~# sudo minicom -b 115200 -D /dev/ttyUSB2

Welcome to minicom 2.7.1

Compiled on Aug 13 2017, 15:25:34.
Port /dev/ttyUSB2, 17:26:09

Press CTRL-A Z for help on special keys

Revision: EP06ELAR03A06M4G


CTRL-A Z for help | 115200 8N1 | NOR | Minicom 2.7.1 | VT102 | Offline | ttyUSB2

On a related note, I have another LTE module, Telit’s LE910-EU V2 with which I’m experiencing no issue: the SIM card is properly detected and I have Internet over PPP, using the same LTE HAT.

What am I missing here? This should be simply working according to the instructions but the EP06-E is failing to recognize the SIM card… Any help would be greatly appreciated, thanks in advance.

Thanks for your query in Quectel forums.
Did you design the external SIM card circuit? Did you refer to the SIM card circuit in our EP06 hardware manual to design your SIM card circuit?
Fly line notice:

  1. SIM - VDD, SIM_DATA SIM_CLK, SIMRST and GND 5 lines, line should not be knocked about 6 cm long.
  2. The cable shoulds not be too thick, too thick welding and other short pins together easily.
    3, the fly line end connected to the SIM gets stuck a PIN, one end of the PIN connection module directly.
  3. The fly line after the completion of the check.
    Hope to help you,thanks.

Hi @Kerr.Yang-Q, thanks for your reply!

Did you design the external SIM card circuit? Did you refer to the SIM card circuit in our EP06 hardware manual to design your SIM card circuit?

No, I am not the designer of this product. Sixfab designed and manufactured it, you can find out more about them on their website:

I’m no expert in electronics but from the hardware design in your answer, this seems to match with the design of the LTE HAT, according to their schematics here: https://github.com/sixfab/Sixfab_RPi_3G-4G-LTE_Base_HAT/blob/master/schematics/RPi_Base_Hat_v1.0.0.pdf

Any other ideas as to why the SIM card is not being detected? Thanks again.