Rockwell Automation 2706-P42_P43_P44_P72_P74_P92_P94 InView Marquee Message Display User Manual - Manual (Page 107)

Publication 2706-UM016D-EN-P - March 2006
InView Protocol 4-41
InView Display
Communication Protocol
Functions and Descriptions The InView display communication protocol that is used in
conjunction with the Modbus ASCII protocol is mostly limited due to
the number of functions and features that required by the InView
products. This Protocol can be used for downloading new messages
of alpha numeric messages from an Allen-Bradley controller.
InView Message Format used within Modbus ASCII Protocol
Information that is used within the InView message is formatted
differently than that of the standard protocol. The following table
shows the basic message structure with a brief explanation of each
part.
Basic InView Message Format
Items in Bold must be used in each transmission. The automation
software will automatically put this information into the message that
is transmitted. Some of these functions are modified from the InView
protocol that is used in the standard product line, for example,
message number versus file labels. Below is a list of the valid values
<SOH> Type Code Display
Address
<STX> Command
Code Message
Control Message
Attributes Insert
Objects Insert
Variables Message
Data <EOT>
Name Description
<SOH> Start of Header
Type Code What display type to communicate with.
Display Address Address of display where information is
written.
<STX> Start of Text
Command Code Describes what type function to perform,
Message priority, and Message number.
Message Control Describes the How the message is
displayed, such as Position, Mode, Pause,
and Justification.
Message Attributes Describes any Font, Color, Width/Height,
and Flash.
Insert Objects Describes any special items that are
inserted within a message such as Time,
Date, and Extended Character set.
Insert Variables Describes Variable number and formatting.
Message Data Data for the Message itself
<EOT> End of Transmission