Homematic Find Option Values

Hi,

I get the following error messages for my Homematic Alarm sirene, when I try to send the flash-type to my sirene.

Alarm_Sirene_Optical_Selection.sendCommand("Simultaneous fast flashing")

Interestingly, OH already knows the right option values, since I am able to set them in the Basic User-Interface.
I am using OH 3.

How do I find out what to send to the item?

Kind regards,

Daniel

Error message:

2021-12-04 21:49:18.883 [ERROR] [ternal.handler.HomematicThingHandler] - Option value 'Simultaneous fast flashing' not found in datapoint '00209A4990E334:3#OPTICAL_ALARM_SELECTION'
org.openhab.binding.homematic.internal.converter.ConverterException: Option value 'Simultaneous fast flashing' not found in datapoint '00209A4990E334:3#OPTICAL_ALARM_SELECTION'

ps. I already tried sending 0 or 1 w/o success.