24 boolean values is returned with the first value indicating the state of the first logic input, the second value indicating the state of the second logic input, and so on.

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.

ExampleDescription

Query current state

S01LI*? of logic inputs.

Status Message

S01LI*111010100010111100001110 , this is an exapmle

response, the actual values will depend on the actual states on the logic inputs.

8.76. LIA -- Assign Action for when Logic Input is Activated

This function assigns a single command to be executed when a given logic input changes from the inactive state to the active 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 LIA command assigns a single command to the logic pin that is executed when the logic pin changes to the active state.

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.

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

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Polycom RS-232 manual LIA -- Assign Action for when Logic Input is Activated, Query current state S01LI*? of logic inputs
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RS-232 specifications

Polycom RS-232 is a key interface utilized in various communication and audiovisual systems, enabling effective integration between different devices. This technology employs a standard serial communication protocol that allows for robust control and communication, particularly in environments that require sophisticated audiovisual setups.

One of the main features of Polycom RS-232 is its ability to facilitate point-to-point communication over distances of up to 50 feet without the need for a repeater. This long-range connectivity is essential in large conference rooms and auditoriums where devices are often spread out over considerable distances. The serial connection is often more reliable than wireless options, which can be susceptible to interference.

Another notable characteristic is its versatile compatibility with a range of devices, including cameras, projectors, and interface panels. This allows users to control multiple devices from a single point, streamlining the operation of complex setups. The straightforward nature of RS-232 commands simplifies integration, which is a significant benefit for both installers and end-users.

Polycom RS-232 also supports various baud rates, giving users the flexibility to optimize communication speed based on their requirements. This adaptability ensures that users can achieve the desired performance, whether they are managing basic functions like power and volume control or more complex commands for switching video sources or adjusting settings.

The technology also features error-checking capabilities, which contribute to its reliability in communication. This reduces the likelihood of issues during operations, ensuring that commands are correctly received and executed. Additionally, its structured protocol aids in diagnosing and troubleshooting, making it easier to manage any issues that arise.

With its robust nature and proven reliability, Polycom RS-232 remains a pivotal technology in the realm of audiovisual communications. Its combination of long-range capabilities, compatibility, flexibility, and reliability makes it an essential tool for enhancing the efficiency of modern communication environments. As technology continues to evolve, the importance of dependable interfaces like Polycom RS-232 cannot be overstated, ensuring seamless integration and operation of sophisticated communication systems. Whether used in educational institutions, corporate environments, or event venues, Polycom RS-232 guarantees a streamlined experience in device management and control.
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