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User Guide | MCX-RTU Rooftop
Broadcast Configuration
© Danfoss | ADAP-KOOL® | 2018.11
How it works
The AK-SM 800 scans all the MCX-RTU controllers once a minute for any sensors setup to bro-
adcast to all the controllers. If YES the AK-SM 800 requests the current sensor values from the
MCX-RTU controllers. Then the SM 800 broadcasts up to 14 sensor values to all the MCX-RTU
controllers in one message. Along with the sensor values a Load Shed Value and status for the
16 Schedules are broadcasted twice a minute. All the broadcast settings are within the MCX-RTU
parameters, there are no AK-SM 800 settings for this feature.
Configure Sensors
Select the Sensors to Broadcast. On each controller go to Parameters -> General. Then use
parameters y16, y17, y18, y19 and y20 to select the sensors that you want to share with the other
controllers. Note that each broadcast value may only be used once.
Select the Broadcast Sensors to use on each MCX-RTU controller. On each controller go to Setup
Options, then set parameters C48, C49, C50, C51 and C52. These parameters tell the controller
whether to use the Local sensor or the Global sensors. You can also use these parameters to disa-
ble the sensors.
Configure Schedules
The schedules used by the MCX-RTU are setup on the AK-SM 800. The schedule status of the first
16 schedules are broadcasted to all the MCX-RTU controllers. There is no assignment of individu-
al MCX-RTU at the AK-SM 800. The schedule assignments are only configured in the MCX-RTUs.
The schedules at the AK-SM 800 are setup at Configuration->Control->Refrigeration->Schedules.
Even though the AK-SM 800 allows for a max of 100 schedules, only the first 16 schedules are
broadcast to the MCX-RTU controllers.
To select Schedule for Night Setback at the MCX-RTU go to Parameters->General. Edit setting
y26 to the schedule number to control Night Setback.
To select Schedule for Title24, go to Parameters->General. Edit setting y29 to the schedule
number you wish to use to control the Title24 option. The Title24 schedule places the controller
in Night Setback.
Configure Load Shed
To set Load Shed Setting, go to Parameters->General.
Edit settings y28 to the Load Shed value. If the Load Shed value that is broadcast from the AK-
SM 800 is greater than this value, the controller will use Night Setback settings.
See the AK-SM 800 User Manual for details on configuring the AK-SM 800 for Load Shedding.
RS8KE102 | 28
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