Specifications

Operations Manual, Redundant System Controllers 209351 REV B 61
5.0.3 I/O Board Assembly
The I/O Board Assembly contains the primary parallel (hardware) interface circuitry of
the controller. It is physically attached to the Digital Core Board by a 40-pin header.
The I/O Board provides the +15 VDC supply for the LNB units. Each output can supply
up to 600 mA and is completely short circuit protected. The 10 form C relays and opto
isolated inputs for the parallel I/O interface are included on this board assembly. A se-
ries of rugged N-channel enhancement mode Mosfet devices provide the current sink
circuitry to drive either one or two waveguide transfer switches.
5.0.4 Vacuum Fluorescent Display
Rarely found in redundant controllers, the RCP provides a large 2 line by 40 character
alphanumeric display. This provides an extremely user friendly interface. The VFD is
directly interfaced to the microcontroller via the address and data bus. Virtually all of
the controller’s setup and adjustments are accessible from the VFD display. There is
no need to access the interior of the controller to make any setup changes.
Figure 5-2: Block Diagram, RCP Digital Core Board