is commonly referred to as active low. Acitve low is considered normal because a closed switch would
ground the input and a closed switch would normally be considered active. This polarity setting can be
changed via the
LIP command.
A single command can be assigned to each of three conditions occurring on the logic pin: a change to
the active state, a change to the inactive state, and a repeating command when the pin is held in the
active state. The LIH command assigns a single command to the logic pin that is executed repeatedly
when the logic pin is held in the active state. This command is useful for volume ramping controls,
especially when combined with the relative operators (< and >) of integer commands (see
Section 6.2).
Although only one command can be assigned to the state change, the command may be a
MACROX or
MACROQ command. Since up to 256 commands can be stored in each macro, this gives the effect of
having up to 256 commands execute when the logic pin changes state. The command associated with
the state change can also be a
PRESETX or PRESETQ. This makes it easy to reconfigure the device for
different rooms based on external logic settings.
The
BROADA is also useful in logic pin assignments. The BROADA command transmits a command to
another device on the EF Bus, so you can effectively make a logic pin state change on one device cause
an action to occur on another device.
ERROR#074 will be generated if the assigned command is one that writes non-volatile memory, and the
pin will not actually be assigned.
See the description of the
LIA for examples on how to use the LIH command. The syntax for this
command is exactly the same. One additional example is given here: using the LIH command for
volume control.
This command is saved to global non-volatile memory and is not part of a preset. Its value is saved
each time it is changed. It will retain its value after power-down. Since this command writes to non-
volatile memory, there will be a delay before an acknowledgment is returned.
Example Description Status Message
T01LIH8,GAINIT>3
Assign the command GAINIT>3 to occur repeatedly
when logic pin 8 is held in the active state. The
GAINIT>3 command causes the gain on input channel T
to increase by 3 dB each time the command is executed.
T01LIH8,GAINIT>3
8.46. LIEN -- Enable Automatic Logic Input Status
Messages
This command controls whether or not logic input status messages are sent automatically. If LIEN is
enabled, then a logic input query (LI*?) is performed any time any of the states change on the logic
input pins. For example, if all logic inputs are currently in the low state ('0') and LIEN is enabled, then
if logic input 12 changes state to '1', the following status message will be generated:
T01LI*000000000001000000000000
To Next Page
Loading...
Need help?
General
Weight and Dimensions
