Description
On Ubuntu 12.04 and newer systems with UsbDio with one or more serial ports, a system program called ModemManager will alter port settings, including baud rate, overwriting the values set by the server. This can interfere with serial ports used for analog PTZ and other purposes. Typical symptoms are that PTZ does not work after reboot.
Changing the port or protocol settings, applying, changing back, and applying the old settings is a temporary workaround.
exacqVisionUsbDio version 1.2.2 or newer has a fix (it adds an annotation to stop ModemManager from accessing the UsbDio serial ports).