ADLINK ACL-7120A/6 - Manual (Page 30)

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• Signal Connections
3.5 Latch Digital Inputs
The ACL-7120A offers a handy method to latch the input status for special
applications. A latched input happens when the STROBE signal (20 pin of
CN2 or CN4) is keep high. The data read from the input port will always
reflect the current status. As the STROBE signal goes from High to Low, it
will latch the input signal and store it in the input buffer. If STROBE is
continually kept on Low, the data on input port is held as the same as the
latched data. The current input signal will not be available until STROBE
becomes High or open.
In most cases, the STROBE signal is always kept as High. The following
table is used to describe the relationship between STROBE signal and input
status.
STROBE SIGNAL Digital Input Data
High Transparent
High to Low Latched
Two STROBE signals are offered in the ACL-7120A, one is on connector
CN2 and the other is on CN4.