TM 11-5830-263-10
1.10.7. System Highway Bus
Within the interconnecting highway cables, VIS uses a two-wire bus for high
frequency serial transmission of digital data for communication and control
functions.
1.10.8. Built-In-Test (BIT)
Upon initial power-up of the MCS VIS automatically goes into (BIT) mode. This
test mode monitors the digital interface of components of the system and the
connect status of the interconnecting ring. Successful completion of BIT results
with "pass" displayed on the MCS's alphanumeric display. It the MCS does not
receive a valid response from a component in configuration memory, or receives
an unexpected response, or does not confirm the connect status of the ring, the
MCS displays "fail" and continually cycles through the configuration differences.
1.10.9. Continuous Performance Monitoring (CPM)
After BIT finishes, VIS goes into Continuous Performance Monitoring (CPM)
mode. CPM monitors components of the system for normal operation. If any
faults occur they are shown on the MCS alphanumeric display in code format.
1.10.10. Auto Reconnect Circuit (ARC)
An Auto Reconnect Circuit (ARC) provides the means of maintaining VIS
operational capability in the event a major component or cable fails. Even in a
case where there is a cut in a station-to-station VIS cable, the overall system
continues to operate without degradation in performance. The system
re-configures itself automatically by, 1). detecting the break, 2). automatically
reconnecting any unconnected units, and 3). maintaining power to each unit. The
ARC circuitry is so fast in reconnecting the data bus that its operation goes
unnoticed, by the crew. To alert the crew that a problem occurred, the CPM
flashes a ring unconnected "ru" .
1.11.
EQUIPMENT DATA
PHYSICAL CHARACTERISTICS
UNIT
HEIGHT
DEPTH
WIDTH
WEIGHT
(IN)
(IN)
(IN)
(LBS)
MCS
6.0
3.75
10.0
5.0
FFCS
4.5
3.5
4.75
1.9
RIT
4.5
3.5
4.75
2.1
MOS
4.5
3.5
4.75
1.4
LS
4.75
3.0
4.75
3.5