Technical data

UART - Serial Input/Output Tests

http://www.motorola.com/computer/literature 3-87

LPBKE - External Loopback

Command Input

PPCx-Diag>UART lpbke

Description

This test transmits 18 characters at 9600 baud. The data is received and

compared. If any protocol errors are created or the data is not correct when

received, the test failed. This test also verifies that modem control lines

may be asserted and deasserted and that these signals are received back by

the UART.

This test does require an external loopback connector to be installed. For

this test, the following connections need to be made in the loopback

connector:

Response/Messages

After the command has been issued, the following line is printed:

UART LPBKE: External Loopback.......... Running --->

If all parts of the test are completed correctly, then the test passes:

UART LPBKE: External Loopback.......Running --->PASSED

If any part of the test fails, then the display appears as follows:

UART LPBKE: External Loopback......Running --->FAILED

UART/LPBKE Test Failure Data:

(error message)

Refer to the section UART Error Messages for a list of the error messages

and their meaning.

TxD connected to RxD

DTR connected to DCD and DSR

RTS connected to CTS and RI