Agilent Technologies E1330B Manuel d'utilisateur télécharger pdf (Page 122)

120 Agilent E1330B Digital I/O Module Register Information

Appendix B

A Register-Based Input Algorithm

The following algorithm describes the procedure you use to program the registers

to read a byte of data from a peripheral. The algorithm follows a flag-driven input

procedure initiated by the computer. The computer polls the Digital I/O module to

see if the data has been transmitted by the peripheral by checking the Port

Transfer/Control Register, bit 0 (referred to as the acknowledge flag - hence, the

name flag-driven). Once the flag is TRUE the computer can read new data from 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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Agilent Technologies E1330B Manuel d'utilisateur Page 122