1. Choose Device > Message > Public Message.

Set the parameters as required based on the following steps:
Device: Select a device to which a message needs to be issued from the drop-down list. (You can choose more than one device.)
Short Message Content: Enter the short message content to be issued.
Start Time: Select the start time for issuing the short message. Please refer to Appendix 3 "Select a Time" for the method of selecting time.
Message Duration: Enter the message display duration.