Rockwell Automation 2706-P42_P43_P44_P72_P74_P92_P94 InView Marquee Message Display User Manual - Manual (Page 67)

1 Publication 2706-UM016D-EN-P - March 2006
Chapter
4
InView Protocol
Introduction The purpose of this chapter is to show the protocol that is required to
trigger messages and update variables on InView displays with the
InView protocol.
In general, messages are downloaded through the software and stored
within the display memory. Up to 4000 messages and 100 (0 to 99)
variables can be created with the InView software.
Messages are displayed using the Control-T function or Modbus ASCII.
One of three different methods can be used.
• Priority messaging
• Add a message
• Remove a displayed message
Variables are updated using the Control-V function or Modbus ASCII.
Trigger Messages and
Update Variables The two functions that are used to trigger messages and update
variables are the Control-T (CRTL-T) and the Control-V (CTRL-V). The
CTRL-T function allows for two different ways of displaying messages,
priority messaging and add/remove messages. The CTRL-V function is
used to update variables on all displays or a specific display.
Priority messaging displays the message number that was just
transmitted to the display. Using this function has precedence over
any priority levels that are used with add/remove messages.
Add/remove messages allows for up to 64 concurrently running
messages to be shown on the display. Messages are cleared one at a
time or all at once. These messages have priority levels assigned to
them that are used to determine how they are displayed.
The CTRL-T Function Frame
The CTRL-T function is used to trigger messages. This function
requires an ASCII decimal value to be used to trigger the desired
message number. The CTRL-T function has the ability for priority
messaging, add a message, or remove a message. Control-T Frame