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AC-425 Hardware Installation and User Guide
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Figure 7: Reader Wiring
3.6
MD-IO84
The MD-IO84 is an optional I/O expansion board that adds 4 relay outputs and 8
supervised inputs to the Access Control Panel. Attach the MD-IO84 to the AC-425's
expansion slot, as marked in red in Figure 8). For more information, see the MD-IO84
Installation and User Guide.
3.7
MD-D04
The MD-D04 is an optional reader expansion board that adds 4 readers, 4 relay outputs
and 4 supervised inputs to the Access Control Panel. Attach the MD-D04 to the AC-425's
expansion slot, as marked in red in Figure 8. For more information, see the MD-D04
Installation and User Guide.
