Rockwell Automation 2755 Enhanced Decoder Series B User Manual
Page 129
9–7
Configuration: AUX and LCD Display Parameters
Publication 2755-833
0
5
STS= 00H
TNS
High Byte
Low Byte
MSB
LSB
1
3
2
8
CMD= 08H
Display Message at AUX Terminal (900H)
Command Address = 900H
4
7
”T”
”S”
10
9
”R”
”A”
12
11
” ”
”T”
14
13
”O”
”J”
15
”!”
”B”
6
When the host sends this command to the decoder, the message
displays on the LCD at the beginning of the line in position 01. The
message remains on the display until it is overwritten by another
message or data.
Remember, the LCD can only display 20 or 40 characters depending
on whether scrolling is enabled. Messages that are longer than 20 or
40 characters will be truncated.
If the PCCC (900H) command is sent without a message defined, the
decoder displays the Default Prompt Message instead.
How Scrolling Affects the Display of Host Messages
Scrolling affects the placement of host messages (and default prompt
messages) on the LCD Display. When scrolling is disabled, each new
message overwrites the last message. When scrolling is enabled, new
messages display on line 2, scrolling the previous message up to line
1.
The following example shows how the LCD handles the host
messages ”START JOB” and ”END JOB” when scrolling is disabled
and enabled.
Scrolling Disabled (Default)
Host message scrolls up to line 1
New host message displays on line 2
Host message displays on line 2
Scrolling Enabled
START JOB
Host message displays
1
21
20
40
1
20
40
1
1
20
20
1
1
20
20
21
New host message over-
writes
previous host message.
1 Line x 40 Character Display
2 Line x 20 Character Display
END JOB
START JOB
START JOB
END JOB