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Chapter 5 - Message Display on EZMarquee
5-3
Message Database
The Message Database holds all messages that you may want to display.
Each message has a unique identifying number. To display a message,
the corresponding message number is moved to message register SR20.
SR20
40
Message Number
Register
Message Number Register
SR20 is defined as the Message Number Register. The message
corresponding to the value in this register is displayed on EZMarquee,
provided that SD5 is set.
System Discretes
The Message Controller function uses a few discrete system bits to
manage the message display. The table below summarizes the functions
of the System Discretes (SD5-SD8):
Bit
Function
Read/Write
Description
SD5
Message Enable
Read/Write
1: Enables message controller function
0: Disables message controller function
SD6
Baud Rate
Read/Write
0: (Default) 9600 Baud
1: 38400 Baud
SD7
Message Number
not found
Read Only
1: Message number in SR20 did not match any message in database
(Message defined as “default” is sent)
0: Otherwise
SD8
Message
Controller Busy
Read Only
1: Message controller busy processing a message
0: Message controller function is free
The operation of the Message Controller is shown in the diagram below:
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