CMUip-2212 Cabinet Monitor Unit
Operations Manual
Eberle Design Inc.
Page 1
Section 1
GENERAL
1.1 OVERVIEW
The model CMUip-2212 Cabinet Monitor Unit (CMUip-2212) is the principle part of the ATC
Traffic Control Cabinet Monitoring System. It is resident in the Output Assembly and
communicates with the High Density Switch Packs (HDSP) located in each Output
Assembly via Serial Bus #3. The role of the CMUip-2212 is to query various cabinet
conditions and, if the application requires action, the CMUip-2212 will transfer control from
the Advanced Traffic Controller (ATC) to a flashing control mode. Applications include the
detection of, and response to, improper and conflicting signals and improper operating
voltages in a cabinet assembly caused by malfunctions of the (ATC), load switches, or miss
wiring of the cabinet.
The communications between the ATC and the CMUip-2212 via Serial Bus #1 plays an
integral role in ensuring safe and proper operation of the cabinet equipment as well as
providing important diagnostic functions used for trouble shooting malfunctioning
equipment.
1.2 CHANNEL CONFIGURATION
The CMUip-2212 can be configured to monitor up to 32 physical load switch channels of
three inputs per channel. Each channel is comprised of a Red / Dont Walk input, a Yellow
input, and a Green / Walk input.
When populated with fourteen or less HDSPs, an additional four virtual channels can be
programmed in the CMUip-2212 to provide a total of 32 logical channels.
1.3 HIGH DENSITY SWITCH PACK (HDSP)
The HDSP-FU (
iPack
®
2202) provides the CMUip-2212 with voltage and current
measurements from each installed Output Assembly. Each HDSP has the capability to
measure and report field terminal voltages and load currents for two channels of three
outputs per channel. Each HDSP is configured by its Output Assembly address. For further
Service
Assembly
Output Assembly
ATC
CMU
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D
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SIU
SIU
Serial Bus #3
Serial Bus #1
Serial Bus #1
ADU
