Matrix Orbital VK204-25 Legacy - Manual (Page 30)

Command Syntax Default Notes
Auto transmit key presses
on
FE 41
254 65
254 ’A’
On Sets auto transmit
mode for keypad.
Key presses are
transmitted to
host without
polling.
Auto transmit key presses
off
FE 4F
254 79
254 ’O’
Off Up to 10 key
presses buffered
until polled.
Clear key buffer FE 45
254 69
254 ’E’
N/A Clear unread key
presses.
Poll keypad FE 26
254 38
254 ’&’
N/A Returns buffered
key presses to
application. Re-
turns 0x00 if
no key presses.
High order bit
set unless this is
the last/only key
press.
Set debounce time FE 55 [time]
254 85 [time]
2 54 ’U’ [time]
52ms Resolution: 1 =
0.6554 ms [time]
is a numeric mul-
tiplier.
7.6 Bar Graphs and Special Characters
The commands in this section are used to define and display bar graphs and special characters.
Table 17: Bar Graphs and Special Characters
Command Syntax Notes
Initialize thick vertical bar
graph
FE 76
254 118
254 ’v’
Initializes the user character set to
make wide vertical bar graphs.
Initialize thin vertical bar
graph
FE 73
254 115
254 ’s’
Initializes the user character set to
make narrow vertical bar graphs.
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