APPENDIX C: Asynchronous Communication

Appendix C: Asynchronous

Communication

In serial data communication, individual bits of a character are transmitted consecutively to a receiver that assembles the bits back into a character. Data rate, error checking, handshaking, and character framing (start/stop bits) are pre- defined and must correspond at both the transmitting and receiving ends.

Asynchronous communication is the standard means of serial data communication for PC and compatible computers. The original PC was equipped with a communication or COM port that was designed around an 8250 Universal Asynchronous Receiver Transmitter (UART), which allows asynchronous serial data to be transferred through a simple and straightforward programming device. The Serial Host Adapter (IC142C) uses a much newer 16554 UART that also features buffering.

Asynchronous communication works this way: A start bit, followed by a pre- defined number of data bits (5, 6, 7, or 8) defines character boundaries for asynchronous communication. The end of the character is defined by the transmission of a pre-defined number of stop bits (usually 1, 1.5, or 2).

Idle State

of

Line

1

0

 

 

Odd

 

 

 

 

 

 

 

 

 

 

 

 

Even

 

 

 

 

 

 

Remain Idle

 

 

or

 

 

 

 

 

 

 

 

or

5 to 8 Data Bits

 

Unused

 

 

 

 

 

 

Next Start Bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parity

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stop Bits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure C-1. Asynchronous Communication Bit Diagram.

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Black Box ICI42C manual Appendix C Asynchronous Communication, Figure C-1. Asynchronous Communication Bit Diagram
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ICI42C specifications

The Black Box ICI42C is a cutting-edge device designed to meet the needs of modern communication infrastructure. It stands out due to its robust features, advanced technology, and remarkable characteristics that cater to a range of applications in various industries.

One of the main features of the ICI42C is its ability to support high-definition video transmission over long distances without any loss in quality. This is particularly advantageous for industries that require reliable video feeds, such as security, broadcast, and remote monitoring. The device employs advanced compression algorithms that ensure seamless streaming of video content while keeping bandwidth usage to a minimum.

In terms of connectivity, the ICI42C is equipped with multiple input and output ports, allowing for versatile integration with existing systems. The device supports various types of connections, including HDMI, SDI, and IP-based systems. This flexibility makes it suitable for both legacy and cutting-edge installations, further enhancing its appeal for businesses looking to upgrade their infrastructure without complete overhauls.

Another significant characteristic of the ICI42C is its user-friendly interface. The device comes with an intuitive web-based management system that allows users to easily configure settings, monitor performance, and conduct troubleshooting. This streamlining of operations is crucial for professionals who require efficient workflows and quick resolutions to any potential issues that may arise during operation.

The ICI42C also boasts a high level of scalability. As businesses grow and their communication needs evolve, the device can adapt to accommodate increased workloads without the need for extensive reconfiguration. This scalability is essential for future-proofing investments, as organizations can expand their capabilities without facing significant obstacles.

Security is a top priority with the Black Box ICI42C. The device incorporates advanced encryption technologies to safeguard transmitted data against unauthorized access. This feature is vital for industries that handle sensitive information and require compliance with stringent regulations.

Additionally, the ICI42C is designed with durability in mind. Its rugged construction ensures reliability in various environments, whether it be a corporate setting, a live event, or an outdoor location. This resilience guarantees longevity and reduces the risk of service interruption due to hardware failure.

In summary, the Black Box ICI42C emerges as a versatile, scalable, and secure solution for high-definition video transmission and advanced communication needs. With its array of features and robust technology, it supports a wide range of applications, making it an essential asset for any organization seeking to enhance its communication infrastructure.
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