Hello,
I have 2 new AirLink FX100 HSPA+ Programmable Modems I’ve begun to evaluate them and have run into a few problems.
Both modems have firmware version R7.50.0.A2.201302191346.FX100, as obtained using the AT+CGMR command.
Problem #1: After waiting the normal 15 seconds for initialization the flash LED lights up, indicating the modem is powered on. With a valid SIM present and inserted properly, and a sufficient RF signal present, the LED turns off after a few seconds, which to me indicates that the modem sees the signal. However, after this the LED stays turned off, and does not flash on and off periodically like it should. I’ve checked using the AT+WHCNF? command at it returns +WHCNF: 1,1,0, which indicates that the flash LED is enabled. So, how can I get the LED to flash on and off like it should? Has anyone else experienced this?
Also, I know that the RF signal is present as I can then issue an AT+CREG=2 command, and the modem will register on the network as expected. However, the LED remains off. I’ve also verified I can make calls between the two FX100 modems using 2G SIMs and 3G USIMs. This behavior is the same on both of the modems I have. I’ve used the prior generation Sierra Wireless FXT003 Modems and others and the LEDs always begin flashing on and off when a valid RF signal from the cellular network is detected. Why are the FX100 modems different?
Problem #2: I telnet into a FX100 modem over a standard RS232 connection to issue AT commands as needed. This works fine. However, after a period of about 10 minutes of inactivity (i.e. no AT commands have been issued), the modem serial connection shuts down. I then have reconnect via telnet again to use the modem. I understand that the modem has a new Serial Connection Shut Down feature, but I do not have it enabled. Why is this happening? Is there any way to configure the modem not to shut down like this? The modems I’ve used in the past never auto disconnect the serial connection, and I am using the same serial cable connection as I’ve used successfully with other Sierra Wireless FXT003 modems before.
Problem #3: The older Sierra Wireless FXT003 modems I have automatically register on the network upon detection of a valid RF signal from the cellular network. However, the FX100 modem does not automatically register. I have to issue an AT+CREG=2 command to manually force the modem to register on the network. Has the auto-register feature been disable with newer modems or firmware like this? Is there any way I can configure the FX100 modem to automatically register (like a cell phone does) when it sees a valid signal?
I look forward to anyone’s 2 cents on any of these problems. Thank you!