HP OpenVMS Systems Documentation

Content starts here E.5 Error Handling
HP OpenVMS I/O User’s Reference Manual: OpenVMS Version 8.4 > Appendix E Programming USB Generic Drivers

E.5 Error Handling

You can encounter any number of errors while developing code to support a device. One common error that you is USB$_STALL, the common way USB devices indicate that the command they just received is invalid. Unfortunately, it is also possible to receive this in normal operation if the device is simply too busy to acknowledge the request.