“Message Displayed” is for the test of TR4030/TR4050 display only. About [Content] area, if you enter the message and then click [Show Text on Display], the message you just entered will be sent to TR4030/TR4050 and shown on the display of it. As for [Duration] setting, it allows you to set how long the message will be shown on the display of TR4030/TR4050. Both of them are for the test purpose.
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