A Register-Based Output Algorithm - Keysight VXI Bus 75000 C Series User And Programming Manual

Keysight E1458A Register Information

A Register-Based Output Algorithm

The following algorithm describes a procedure to program the registers to
transmit a byte of data to a peripheral. The algorithm follows a flag-driven output
procedure initiated by the computer. The computer polls the Keysight E1458A
Digital I/O Module to see if the data has been accepted by the peripheral by
checking the Port Transfer/Control Register, bit 0 (referred to as the
acknowledge flag --- hence, the name of flag-driven). Once the flag is TRUE the
computer can output new data to the port. The actual path followed by the
peripheral and the digital I/O module to set this bit is controlled by the
handshake mode you select.
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A Register-Based Output Algorithm
Keysight E1458A 96-Channel Digital I/O Module User Guide