Question: How can I send AT commands to the serial interface for cellular modules in order to acquire status messages and change configurations etc.?

Solution: When module drivers are installed correctly in your host system, you can find several serial ports in Windows device manager. The AT-commands are sent to the specific serial port meant for modem connection or AT-commands specific. The serial port names are the following depending on manufacturer ..

Question: What requirements and steps are needed to get our end-devices certified for US network operator AT&T when it consists of a pre-certified cellular module inside?

Solution: The AT&T Certification consists of the following components bellow where the major part is end device FCC and PTCRB certification. For latest details regarding certification and requirements, please see: iotdevices.att.com/networkready AT&T Certification • Pre-Requisites to enter lab for..

Question: Why is there no AT-commands serial interface available in Microsoft Windows 8/10, while in Windows 7 all the module interfaces are available.

Solution: Microsoft demands cellular module makers to use the Mobile Broadband Interface Model (MBIM) in newer operating systems like Windows 8 and 10 rather than the previous serial based control channels with AT commands. The serial ports are phased out and enumeration in the host system of these are droppe..

Question: The M.2 to miniPCIe adapter with SIM-slot doesn't fit in all host systems, why?

Solution: Some host systems miniPCIe sockets are not compatible with the design of this adapter, this because the SIM card holder situated on the underside of the adapter circuit card close to where the hosts miniPCIe socket connects can short circuit the socket wires in some variants of miniPCIe slots. Plea..

Question: How can we use the Huawei ME909s series modules with dual Ethernet interfaces and separate APNs in parallel?

Solution: The Huawei ME909s series modules can now support dual APN and dual ECM network interfaces starting from firmware version 11.617.06.00.00. This gives the host systems the ability to separate the IP traffic for dedicated services or use cases. A SIM subscription supporting separate active APN conne..

Question: Windows system show multiple network devices for my Sierra Wireless MC74-, EM74-series cellular module

Solution: Sending the following AT Commands to the modules MODEM Serial COM port interface will change the USB profile for exposed interfaces towards host system. Setting for DIAG, NMEA, MODEM, RMNET0 interface: (Linux - QMI with one network interface) 1. AT!ENTERCND=”A710” 2. AT!USBCOMP=1,1,10D 3. AT!RE..

Question: How can we capture DM serial port logs for Sierra Wireless EM/MC series cellular modules in Linux?

Solution: In the Sierra Wireless QMI SDK downloadable archive there is a a DM log tool in the tools folder. Run the dmcapture.sh script with desired filter, and the ttyUSB0 (DM port) device selected. E.g. like this: sudo ./dmcapture.sh -l -d /dev/ttyUSB0 -o testlog -f ./filters/v11026_Generic_GSM_WCDMA_LTE_..

Question: How can I enable DC voltage output for active GPS/GNSS antennas on modules that support this feature?

Solution: This is enabled by the following AT commands: For Sierra Wireless EM/MC74 series (Output: 3.15V): AT!ENTERCND="A710" AT+WANT=1 For Sierra Wireless MC73 series (Output: 3.15V): AT!ENTERCND="A710" AT+WANTGNSSPWR=1 For Simcom (Max output 61*50mV = 3.05V): AT+CVAUXS=1 AT+CVAUXV=61

Question: The Sierra Wireless EM74-series modules cannot get a fix on GPS/Satellite navigation system even if I have connected the antenna correctly?

Solution: The Sierra Wireless EM74-series modules can be adjusted to read the GPS signals from either the AUX/Diversity antenna connector or the dedicated GPS antenna connector on the module. This can be configured through the AT!CUSTOM commands: GPSSEL 0 = Use dedicated GPS antenna (Default) 1 = Use shared ..

Question: Sierra Wireless EM7455 module is not detected in the operating system when using the M.2 to USB adapter board

Solution: For Sierra Wireless EM7455 you will have to change the state of the jumper JP1 on the board. This controls the Dynamic Power Control (DPR) pin in M.2 socket. You can either remove the jumper piece and leave all 3 pins not connected or set it low by connecting the pins 2 and 3 with the jumper piece..