ibgts() is the complement of ibcac(), and causes the board specified by the board descriptor ud to go to standby by releasing the ATN line. The board must be controller-in-change to change the state of the ATN line. If shadow_handshake is nonzero, then the board will handshake any data bytes it receives until it encounters an EOI or end-of-string character, or the ATN line is asserted again. The received data is discarded.
It is generally not necessary to call ibgts(). It is provided for advanced users who want direct, low-level access to the GPIB bus.
The value of ibsta is returned.