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124 Chapter 2
Programming Fundamentals
Overview of the RS-232 Bus
Overview of the RS-232 Bus
This feature is not implemented.
Serial interface programming techniques are similar to most general
I/O applications. Refer to your programming language documentation
for information on how to initiate the card and verify the status.
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 bus. Some common serial interface configuration
settings are:
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?
Baud Rate to 9600
Bits per character to 8
Parity to Odd and disabled
Stop bits to 1