Epson 386 User's Guide download pdf (Page 168)

When you select option 11 from the DEVICE LIST, you see these

prompts:

Attach loop-back connector to serial port.

Enter Y to start this check when connector is

attached, or

Enter N to return to the menu.

Insert the loop-back connector. Then press Y and Enter to start the

check.

First, the computer checks the serial port control lines to see that they

are able to change from high to low and vice versa. No messages

display during this part of the test unless an error occurs.

The second test is an echo back check during which the port sends

data to itself in a fixed data format, at all the possible baud rates.

When this test begins, you see these messages:

RS232C echo back check - at various baud rates

Current baud rate is 75

Current test data is 00

Each baud rate is tested in turn, and the display informs you of the

progress of the test. If the port does not become ready correctly, a

timeout error occurs. If any data received does not match the data

sent, a verify error occurs, and the computer reports the transmitted

and received data at the time of the error.

The final test is an echo back check during which the port sends data

to itself at 9600 baud, using various data formats. At the start of the

test, you see these messages:

RS232C echo back check-with various data formats

Current data format: 5 data bits, 1 stop bits,

parity - NONE

Current test data is 00

Once again, if any data received does not match the data sent, a

verify error occurs, and the computer reports the transmitted and

received data at the time of the error.

C-24

Performing System Diagnostics

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Epson 386 User's Guide Page 168