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The RS-232C, GPIB, and Centronix Interface
The RS-232C Interface
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.
To set the baud rate, select the Baud Rate field. Then, select the desired rate
from the pop-up selection list.
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.
To change the Stop Bits, select the Stop Bits field, then select the desired
stop bit from the pop-up selection list.
Parity
The parity bit detects errors as incoming characters are received. If the
parity bit does not match the expected value, the character is assumed to be
incorrectly received. The action taken when an error is detected depends on
how the interface and the device program are configured.
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.
To set the parity bit, select the Parity field, then select the desired Parity bit
from the pop-up selection list.
Data Bits
Data bits are the number of bits sent and received per character that
represent the binary code of that character. The 1660A Series supports the
8-bit binary code.
7–11
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