отбой. сам нашел в спецификации
https://www.usb.org/sites/default/files/usbprint11...
Bi-directional Interface. The bi-directional interface supports sending data to the printer via a Bulk OUT
endpoint, and receiving status and other information from the printer via a Bulk IN endpoint. Status data
that is compatible with a standard PC parallel port is also available when this interface is in use via the
GET_PORT_STATUS class-specific command over the default pipe. For more information about status
data, see Section 4.2.2, “GET_PORT_STATUS.”