CMU-24VDC-ITL Cabinet Monitor Unit
Operations Manual
Eberle Design Inc.
Page 13
3.4.6 FRONT / REAR DOOR SWITCH
The cabinet should be wired such that +24VDC is applied to the DOOR SWITCH FRONT
or DOOR SWITCH REAR inputs when the respective door is Open. These inputs will be
considered active when the input voltage exceeds the Active threshold defined in Cabinet
Control 5.1. These inputs will not be considered active when the input voltage is less than
the Not Active threshold defined in Cabinet Control 5.1. The CMU-24VDC will report the
state of these inputs in the Type 189 frame.
The Datakey not present will cause a LFSA if the DOOR SWITCH FRONT input is sensed
as not active (door closed). See section 2.14.3.
3.5 MONITOR INTERLOCK
The MONITOR INTERLOCK input is connected to VDC GROUND within the CMU-24VDC.
The cabinet should be wired such that the lack of VDC GROUND on this pin forces the
cabinet to the flash mode. This prevents a cabinet from operating without a CMU-24VDC
installed.
3.6 EXTERNAL TEST RESET INPUT
The EXTERNAL TEST RESET input is used to reset the CMU-24VDC from the FSA
condition. When the EXTERNAL TEST RESET input is connected to VDC GROUND (True)
all front panel indicators will be illuminated for 100 msec and the OUTPUT relay energized.
Continuously activating the input will not affect CMU-24VDC operation.
The EXTERNAL TEST RESET input is intended for use in testing the CMU-24VDC and
should not be connected in the cabinet.
3.7 SERIAL BUS #1 ADDRESS INPUTS
The Address Select input pins ADDRESS 0 and ADDRESS 1 define the Serial Bus #1
address of the CMU. The pins are left open for a logical False, and are connected to VDC
GROUND for a logical True.
ADDRESS 1 ADDRESS 0 SB #1 ADDRESS
False
False
0x0F
False
True
0x10
True
False
0x11
True
True
0x12
The default address for the CMU is 0x0F. If multiple CMU units are not installed on Serial
Bus #1 these inputs should be left in the False (open) state.
3.8 SERIAL BUS #1 DISABLE INPUT
The SERIAL BUS #1 DISABLE input is used to prevent a Serial Bus #1 Error when
communications from the ATC is not active. When the SERIAL BUS #1 DISABLE input is
connected to VDC GROUND (True) The CMU-24VDC will not communicate on Serial Bus
#1 or set a FSA condition if communications from the ATC is not present. See section
2.3.1.
The SERIAL BUS #1 DISABLE input is intended for use in testing the CMU-24VDC and
should not be connected in the cabinet.
3.9 PDA TEMPERATURE
The CMU-24VDC will measure the ambient temperature in the PDA and report this value in
the Type 182 frame. This temperature indication may be used to analyze malfunctions that
could be related to over heating or cold conditions.
