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Logic Analyzer Reference
The RS-232-C, GPIB, and Centronics Interfaces
The RS-232-C interface
The RS-232-C interface is Agilent Technologies’ implementation of EIA
Recommended Standard RS-232-C, "Interface Between Data Terminal
Equipment and Data Communications Equipment Employing Serial
Binary Data Interchange."
With this interface, data is sent one bit at a time and characters are not
synchronized with preceding or subsequent data characters. Each
character is sent as a complete entity independent of other events.
The paragraphs below describe the settings for RS-232-C. You can
change these settings by going to the System External I/O menu and
selecting RS232 Settings. Each field in the Settings pop-up menu
presents a list of valid choices.

Baud rate

The baud rate is the rate at which bits are transferred between the
interface and the peripheral. The baud rate must be set to transmit and
receive at the same rate as the peripheral.

Stop Bits

Stop Bits are used to identify the end of a character. The number of
Stop Bits must be the same for the controller as for the logic analyzer.

Parity

The parity bit detects errors as incoming characters are received. If the
parity bit does not match the expected value, the character was
incorrectly received. The action taken when an error is detected
depends on the interface and the device program configuration.
Parity is determined by the requirements of the system. The parity bit
may be included or omitted from each character by enabling or
disabling the parity function.