I have noticed that in the more recent RUT965 (hardware version) it’s not possible to control the RS232 control signals from the termios api, the ioctl command just return “invalid argument”. For the rs485 port this just works fine (nothing to control) but the ioctl api does not return any error. The latest firware works ok in and older RUT956 hardware version.
I have the same problem in batch 019 RUT956. ioctl worked fine on batch 003 device.
This problem on TRB245 might be related, unfortunately no solution is posted: Cannot read modem signal lines status for rs232 and rs485 devices using ioctl() function. - Crowd Support Forum | Teltonika Networks
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