Manual Polycom Vortex EF2280 (page 63 of 105) (English)

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state. Typically, the inactive state is logic high ('1') and the active state is logic low ('0'). This 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

F01LIH8,GAINIA>3

Assign the command GAINIA>3 to occur repeatedly when logic

pin 8 is held in the active state. The GAINIA>3 command causes

the gain on input channel A to increase by 3 dB each time the

command is executed.

F01LIH8,GAINIA>3

8.67. 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:

F01LI*000000000001000000000000

A status message is only generated if there is a state change. This helps keep data traffic to a minimum.

This command is a boolean command. See

Section 6.1 for more information on this type of command.

This command is saved to non-volatile memory only as part of a preset. The state of this command will be

restored after power-up only if a preset is saved and that preset is set to be the power-on preset.

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Polycom Vortex EF2280 Manual

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