AT&T 3B2 Off-Line Diagnostic Manual page 440

Phase Descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Test Number:
Function:
Procedure:
2
This test verifies that the DUART I, Port 2 can internally loop ASCII characters
at 19200 baud.
The DUART is initialized for internal loop around using 7 bits and no parity.
The baud is set at 19200. The transmitted and received characters are verified
to match.
Hardware Tested: The DUART 1 (SC2681) is tested.
Data Returned: The number of the failing test, the ASCII character received, and the ASCII
character transmitted are returned.
Test Number: (3)
Function: This test verifies the ability of the DUART to send an interrupt when the
Receive Data register on DUART I, Port 1 is enabled and a character is
received.
Procedure: Port 1 is initialized to transmit and receive interrupts. The interrupts consist of
7 bits, no parity, and 2 Stop bits. The baud rate is set to 9600 bits per second
(bps). Set the DUART to send an interrupt when the Receive Data register is
enabled and has received a character; then check that the interrupt was
correctly received.
Hardware Tested: The DUART 1 (SC2681) is tested.
Data Returned: The number of the failing test, the ASCII character received, and the ASCII
character transmitted are returned.
Test Number: (4)
Function: This test verifies the ability of the DUART to send an interrupt when the
Transmit Data register on DUART I, Port 1 is enabled and after a character is
transmitted.
Procedure: Port 1 is initialized to transmit and receive interrupts. The interrupts consist of
7 bits, no parity, and 2 Stop bits. The baud rate is set to 9600 bps. Set the
DUART to send an interrupt when the Transmit Data register is enabled and a
character has been transmitted; then check that the interrupt was correctly
received.
Hardware Tested: The DUART 1 (SC2681) is tested.
Data Returned: The number of the failing test, the ASCII character received, and the ASCII
character transmitted are returned.
8-62 OFF-LINE DIAGNOSTIC MANUAL