CMUip-2212 Cabinet Monitor Unit
Operations Manual
Eberle Design Inc.
Page 5
Section 2
MONITOR FUNCTIONS
2.1 CABINET POWER SUPPLY MONITOR
The CMUip-2212 will sense the C48VDC, +24VDC and +12VDC power supply
sources. The CMUip-2212 will also sense the C24VDC state as reported by each
HDSP. Voltages less than the threshold voltages for the Fault time or longer (section 5.2)
will cause a LFSA. A +48VDC, +24VDC failure or +12VDC failure during the programmed
Minimum Flash time or during a CMUip-2212 Power Failure will not cause a LFSA. The
CMUip-2212 will report the value of the +24 VDC and +12 VDC power supply sources in
the Type 209 response frame.
There is programming in the Datakey to d12 VDC and 48VDC power supply
monitoring.
2.2 CONFLICTING CHANNELS MONITOR
For purpose of conflict determination, an active signal on either of the Green/Walk or
Yellow inputs associated with any of the 32 channels will be considered as that channel
being active. The Datakey will contain the permissive channel pair programming.
When any conflicting channels are detected as concurrently active for less than the No
Fault time (section 5.2) the CMUip-2212 will not cause a LFSA. When any conflicting
channels are detected as concurrently active for the Fault time or longer (section 5.2), the
CMUip-2212 will cause a LFSA. For all other timing in between, the CMUip-2212 may or
may not cause a LFSA.
2.3 SERIAL BUS MONITOR
The CMUip-2212 communicates with both Serial Bus (SB) #1 and #3. In SB #1 the CMUip-
2212 is a Secondary device, polled by the ATC Primary device. On SB #1, the CMUip-2212
will respond to the Serial Bus #1 Address defined by the ADDRESS 0 and ADDRESS 1
pins. On SB #3 the CMUip-2212 is the Primary device, polling each HDSP or HDFU
Secondary device.
2.3.1 SERIAL BUS #1 ERROR
The CMUip-2212 will cause a FSA when a Type 81 or Type 67 Frame has not been
received from the ATC for greater than the Fault time (section 5.2). The first and second
failures in a 24-hour period will be a NFSA. The third failure in a 24-hour period will be a
LFSA-R. If a CMUip-2212 Power Fail resets the LFSA-R, the SB #1 failure count will be
reset to two, such that the next SB #1 timeout results in a LFSA-R.
A SB #1 timeout failure during the programmed Minimum Flash time or during a CMUip-
2212 Power Failure will not cause a FSA. The SB #1 Timeout function will be disabled if the
SB #1 DISABLE input is at a True (Low) state
2.3.2 SERIAL BUS #3 ERROR
The CMUip-2212 will cause a FSA when a Type 129 or Type 130 Frame has not been
received from each enabled HDSP for greater than the Fault time (section 5.2). The first
and second failures in a 24-hour period will be a NFSA. The third failure in a 24-hour period
will be a LFSA-R. If a CMUip-2212 Power Fail resets the LFSA-R, the SB #3 timeout count
will be reset to two, such that the next SB #3 timeout results in a LFSA-R.
A SB #3 timeout failure during the programmed Minimum Flash time or during a CMUip-
2212 Power Failure will not cause a FSA.
