Specifications

Jumper Configurations
JUMPER DESCRIPTIONS
Table A-1
Jumper Descriptions.
JUMPER # DESCRIPTION
W1 Install this jumper when using the AC
Power-Fail Detect option. This option
requires use of the ZT 90071 24 VAC
Transformer plugged into connector J5. The
ZT 8809A power-fail circuitry is then able to
detect AC power failure and generate a non-
maskable interrupt to the processor for early
warning of impending DC power failure.
Factory default removes this jumper.
W1 Function
IN Enable AC Power-Fail Detect
NMI request (PNMI*)
OUT † Disable AC Power-Fail Detect
NMI request
A-3