- Omega 8 Channel Thermocouple USB Data Acquisition Module User's Guide

Technical reference

3.3.2

New USB mode and legacy mode

3.3.2.1

usb_tc08_open_unit

short usb_tc08_open_unit (void)

This routine returns a valid handle to the USB TC-08 if the driver successfully opens it.

If the routine fails, see the error code explanations in the usb_tc08_get_last_error

section. If you wish to use more than one USB TC-08, call this routine once for each

unit connected to the PC. The function will return 0 if there are no more units found.

The driver is thread-safe and will not allow access to a single unit from more than one

application. If, therefore, usb_tc08_open_unit does not find a unit, check that

other applications are not using the USB TC-08. This includes applications on other

user accounts on the same computer, where fast user switching is supported.

Note: The usb_tc08_open_unit function provides a simple way to open USB TC-08

units. However, the function call locks up the calling thread until the attached USB

TC-08 unit has been fully enumerated. If a single-threaded application needs to

perform concurrent processing, such as displaying a progress bar, use

usb_tc08_open_unit_async.

Arguments

None