Agilent Technologies E1330B Manual do Utilizador Página 122

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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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