Rockwell Automation 2706-M1 MESSAGEVIEW 421 HARDWARE MANUAL - Manual (Page 75)

4–15 Running Applications
Publication 2706–816
Field 1: Optional Control Byte
This is an optional field which indicates the text size of the slaved
message as it is transmitted. The following characters are used:
Byte Decimal Value Definition
Default – Quarter height text
Ctrl-S 19 Half height text
Ctrl-W 23 Full height text
Ctrl-C 3
Clear Display line, based on Line Number Byte.
Used with Line Number Byte to specify line.
The optional Control Byte may be omitted. If omitted, the default
size will be Quarter height text.
If the Auto Format attribute is enabled, the Optional Control Byte is
automatically embedded, based on the text size selected in the
message’s Text Size attribute.
The Optional Control Byte may be placed in the message manually,
embedding it as the first character in the text portion of the message.
It overrides a Control Byte embedded by Auto Format.
Field 2: ASCII Text
This field contains the ASCII characters and/or special ASCII
control characters that are to be displayed by, or to control, a slave
device.
The ASCII text can include embedded variables, graphics and
control codes for Flash and Inverse Video. It can have up to 100
characters.
The following codes may be embedded in the ASCII text:
Byte Decimal Value Definition
Ctrl-F 6
toggle between Flashing and non–Flashing
characters
Ctrl-I 9
toggle between Inverse Video and non–Inverse
Video characters
Ctrl-G 7
Embedded Graphic, where the next byte is a
graphic, ISA symbol 1 to 32
If Auto Format is enabled, Flash and Inverse Video control
characters will be embedded automatically, based on whether the
attribute is enabled in the Message Edit box.
If the first or last byte of the ASCII Text field is a control character,
it will be interpreted as the Optional Control Byte and the Optional
Display Mode Byte, respectively.