CMUip-2212 Cabinet Monitor Unit
Operations Manual
Eberle Design Inc.
Page 3
1.7 SERIAL BUS #1
Serial Bus #1 provides a communication path between the CMUip-2212 to the ATC. The
communications between the ATC and the CMUip-2212 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. Standardized
communications can be broken into three categories; real time and latched fault status,
configuration verification, and malfunction detection and diagnosis.
Messages are defined that allow the ATC and the CMUip-2212 to perform redundant
checks on each other. The ATC has access to all CMUip-2212 information including field
signal input status, permissive programming, and fault status. This gives the ATC the
capability to provide a backup monitoring function and make enhanced event logging,
remote intersection monitoring, and remote diagnostics feasible. Similarly, the CMUip-2212
receives information from the ATC that corresponds to the output commands to the load
switches. This data allows the CMUip-2212 to better respond to and diagnose fault
situations.
1.7.1 SERIAL BUS #1 MESSAGE TYPES
The CMUip-2212 is compatible with the following message types:
Type 60 Module Identification Command / Type 188 Module Identification Response
Type 80 Module Description Command / Type 208 Module Description Response
Type 81 Load Switch Drivers Command / Type 209 CMU Status Response
Type 62 Set FSA Command / Type 190 FSA Response
Type 82 Get CMU Configuration Command / Type 210 CMU Configuration Response
Type 66 Time and Date Broadcast Command
Type 67 Load Switch Drivers Command / Type 195 CMU Short Status Response
1.8 SERIAL BUS #3
Serial Bus #3 is used to transfer data from a maximum of sixteen HDSP units and two High
Density Flasher Units (HDFU) to the CMU-2212. The CMUip-2212 will poll each HDSP for
its voltage and load current data every 32 milliseconds. The CMUip-2212 then maps the
retrieved data to the proper logical channel and evaluates the state of the field signals for
fault conditions.
1.8.1 SERIAL BUS #3 MESSAGE TYPES
The CMUip-2212 is compatible with the following message types:
Type 1 HDSP Status Command / Type 129 Status Response
Type 2 HDFU Status Command / Type 130 HDFU Response
Type 60 Module ID Command / Type 188 Module ID Response
Type 128 Negative Acknowledge Response
