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PXS8 ttyUSBx are locked on Linux system after SDPORT change | Thales IoT Developer Community

December 10, 2015 - 12:49pm, 2532 views


I work under Linux, I have configured the PXS8 modem with this at command "AT^SDPORT=6" (old value is 3), after that the /dev/ttyACM0 appears but after few seconds this interface disappears and ttyUSBx reappears and SDPORTcome back to 3.

I tried to switch to ttyACM0 many ***** but I can't succeed.

I tried to change the at command "AT^SDPORT=2" to test if the value is accepted or not. The modem restart and after that I can't access to ttyUSBx, the interfaces exist but I can't write at commands, I tried with echo, microcom,.. but no result and I can't come back to sdport = 3.

Here my interfaces permissions displayed by ls /dev/ttyUSB* -l:

crw-rw---- 1 root dialout 188, 0 Feb  1 00:02 /dev/ttyUSB0

crw-rw---- 1 root dialout 188, 1 Feb  1 00:02 /dev/ttyUSB1

crw-rw---- 1 root dialout 188, 2 Feb  1 00:05 /dev/ttyUSB2

crw-rw---- 1 root dialout 188, 3 Feb  1 00:05 /dev/ttyUSB3

Have you any solution for this problem? Is it caused by Linux driver? or It a bug in the modem firmware it self? and How can restore it?

Note: I have restarted the modem (or/and whole system) many ***** but always interfaces locked.