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Introduction
ADLINK PXI-7921 is a relay multiplexer which consists of 24 2-wire relays (DPDT, 2 Form C). As a multiplexer,
the PXI-7921 provides 48x1 1-wire, 24x1 2-wire and 12x1 4-wire configurations. Users could choose one of the
configurations by software. PXI-7921 typically connects one instrument, such as a DMM, a digitizer or a signal
source, with many points which need measurement or excitation.
The contact position of the relays can be changed either by direct software commands or by following the
instructions previously stored in the on-board scan list. The scan list advances upon the trigger from external
measurement devices, such as a DMM. The scan list could also advance when the scan-delay timer expires. In
the PXI-7921, PXI trigger functions are supported and software programmable. Multiple modules can therefore
be synchronized without additional field wiring.
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