Example
Description
Status Message
T01LO*00000000000000000000
Set all logic
outputs low.
T01LO*00000000000000000000
T01LO*10101010101010101010
Set even
numbered logic
output pins low
and odd
numbered logic
output pins high.
T01LO*10101010101010101010
T01LO*?
Query current
state of logic
outputs
T01LO*abcdefghijklmnopqrst
, where
a
-
t
are each
0
or
1
depending on the current state
of the corresponding logic output.
8.53.
LOA
-- Define Behavior for Logic Output Activated
State
This command is used to define the conditions under which a given logic output pin goes into the active
state. By default the logic output pins are active high. Active high is the default because it would light
an LED connected to the output when the output was in the active state. The polarity of the logic
output pins can be changed with the
LOP
command.
The syntax of this command allows one to use one of the boolean channel commands to determine the
state of the logic output pin. The commands that are valid for use with
LOA
are
AGC
,
MUTEO
,
MUTEI
,
and
NC
. Each command must be specified using the wildcard character,
*
, for the channel number.
Each character in the array string is compared to the status of the channels in the Vortex. A
1
or a
0
in
the string means that the status for the corresponding channel must match that character for the
condition to be true. A period character,
.
, in the string is a don't care, meaning that the condition will
be true no matter what the status for that channel is. A
+
or
-
character works as an OR function, with
+
corresponding to a
1
in the channel status and
-
corresponding to a
0
. If any
+
or
-
characters are in
the string, at least one channel's status must match for the condition to be true.
The special characters
.
,
+
, and
-
are not particularly useful on the EF2201, since there is only one
input channel and one output channel. The special characters are more useful on the other EF22xx
devices that have more inputs and outputs. Typically, only the
0
and
1
characters are used with this
command on the EF2201.
Consider the following example. In this example, we also use the
LOD
command, which is just like the
LOA
command except that it sets the condition for the logic output to be in the deactivated state.
Normally, you must set both the
LOA
and
LOD
commands in order to make use of a logic output pin. In
our example, we issue the following commands:
T01LOA10,MUTEI*1
T01LOD10,MUTEI*0
