HMX Modem

Overview

The HMX has a modem from Quectel called EM05 with a GPS receiver.

Starting/Enabling modem

The modem is turned on by default. To disable it, set the GPIO MODEM_PWR to 0. To reset it use MODEM_RST and set it to 0, then back to 1 after a second.

root@10210100023:~# gpioinfo | grep MODEM
        line  10:  "MODEM_PWR"       unused   input  active-high
        line  20:  "MODEM_RST"       unused   input  active-high

gpioset $(gpiofind MODEM_PWR)=0

* The modem takes about 10 seconds to start and register itself with the kernel. It then takes up to one minute before it is registered in the linux usb list.

* Check USB TTY device to see if it has shown up.


```bash
find /dev -name "ttyUSB*"

/dev/ttyUSB3
/dev/ttyUSB2
/dev/ttyUSB1
/dev/ttyUSB0

• The modem also shows up with the lsusb command.

root@10210100023:~# lsusb | grep Quectel
Bus 001 Device 007: ID 2c7c:030a Quectel Wireless Solutions Co., Ltd. Quectel EM05-G

Production settings(default)

• Sim card detect
• AT+QSIMDET=1,1
  • Needs a restart to take effect
• AT+QSIMSTAT?
  • 0 Off, 1 On first parameter
• GPS (not confirmed)
• AT+QGPSCFG="autogps",1
• AT+QGPSCFG="nmeasrc",1

Test SIM card

GPS

Use WvDial to get a broadband connection

Sleep and wake up

When the modem has a URC to report, a WOWWAN# pin signal will wake up the host. To be able to power down the modem, set QSCLK to 1 ```bash echo -ne "AT+QSCLK=1\r\n" | microcom -X /dev/ttyUSB2 -t 100

Note: Not verified to work, support case issued where this pin never goes from state low to high.