Programming Fundamentals

Overview of RS-232 (Option 1AX)

Overview of RS-232 (Option 1AX)

Serial interface programming techniques are similar to most general I/O applications. Due to the asynchronous nature of serial I/O operations, special care must be exercised to ensure that data is not lost by sending to another device before the device is ready to receive. Modem line handshaking can he used to help solve this problem. These and other topics are discussed in greater detail in your programming language documentation.

Settings for the Serial Interface

Please refer to the documentation on your computer and I/O to configure the serial interface. Some common serial interface configuration settings are:

Baud Rate to

9600

Bits per character to

8

Parity to

Odd or disabled

Stop bits to

1

Handshake and Baud Rate

To determine hardware operating parameters, you need to know the answer for each of the following questions about the peripheral device:

•Which of the following signal and control lines are actively used during communication with the peripheral?

—Data Set Ready (DSR)

—Clear to Send (CTS)

•What baud rate is expected by the peripheral?

Character Format Parameters

To define the character format, you must know the requirements of the peripheral device for the following parameters:

•Character Length: Eight data bits are used for each character, excluding start, stop, and parity bits.

•Parity Enable: Parity is disabled (absent) for each character.

•Stop Bits: One stop bit is included with each character.

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Agilent Technologies Model A.08.xx manual Overview of RS-232 Option 1AX, Settings for the Serial Interface
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