ANSI Mode Host Commands
52
•
nKey Rollover
— while in ACM, you can press any combination of keys in any order,
and the terminal will send the resultant key codes in tandem (i.e., pressing CTRL, SHIFT
and F1 will send
11h
,
7Ch
, and
5Ch
) and then the corresponding key codes in tandem,
when you release the keys (
91h
,
FCh
, and
DCh
).
However, if a combination of three pressed keys results in a pressed key sharing a
common column or row with another pressed key (i.e., form a corner), the terminal will
not transmit the resulting key codes because the matrix system used by the terminal for
key detection will find a “Ghost” key as illustrated in Figure 5-3:
Figure 5-3: Ghost Key
•
Modifier Keys
—while in ACM, the
CTRL
and
SHIFT
keys will not work as modifier
keys; they can only change the mode indicator on the display as shown in the table
below.
Table 5-3: ACM Mode– SHIFT and CTRL Key Results
Command Function
Key
Indicator Press Release
Esc [4v
Disabled
SHIFT
None
5C
DC
Disabled
CTRL
None
7C
FC
Esc [5v
Enabled
SHIFT
5C DC
Disabled
CTRL
None
7C
FC
Esc [6v
Disabled
SHIFT
None
5C
DC
Enabled
CTRL
7C FC
Esc [7v
Enabled
SHIFT
5C DC
Enabled
CTRL
7C FC
Enabled
CTRL,
SHIFT
5C, 7C
DC ,FC