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Message Options
Communications Options
Background Message
The background message is a user-defined message that automatically
displays when no other messages are being displayed.
Invisible Message
Invisible messages do not appear on the display when triggered, nor do they
affect what is on the display. Invisible messages can be sent to slaves,
printed, or saved in the Historical Event Stack.
Special Messages
Sixteen preprogrammed messages are available to trigger specific functions.
They can clear the display, reset the DL20, test batteries, print Historical
Event Stack, clear the Historical Event Stack, halt run mode and start run
mode. Special messages are optional and can simplify programming
requirements.
Formatted Variables with Decimal Point
You can imbed a formatted variable with a decimal point in a message.
When programming a message variable, you can specify:
number of spaces the variable will occupy
where to place the decimal point
whether leading zeros should appear or be replaced by blanks
Data Trigger Modes
Separate data modes are available for inputting message triggers and
variables through the parallel port. Message triggers can be binary, while
variable data can be BCD, or vice versa.
Dynamic Message Chaining
Dynamic chaining allows you to load 20 message triggers into the DL20
causing those messages to display over and over again.
Historical Event Recording
Historical Event Recording allows the DL20 to remember messages that
were displayed. These messages can then be printed all at once or at a later
time. See Chapters 4 and 5 for details on Historical Event Recording.
Baud Rate
The DL20 supports baud rates of 300, 1200, 9600. On powerup, the DL20
displays the baud rate currently in effect.
Parity
The DL20 can transmit data with odd, even or no parity. Data received by
the DL20 is not checked for parity. The parity you select is displayed
immediately after the baud rate on powerup.
Chapter 2
Introduction to the DL20
2–5
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