Troubleshooting Terminal, Printer and Serial Device Connections - Edition 4 (32022-90030)

44 Chapter 4
TermDSM Commands
DI[AG] EXT[ERNAL]
DI[AG] EXT[ERNAL]
Determines if a specific port is functioning properly , including the
connector. Sends data out and reads it immediately, verifying that the
data received is exactly what was sent. DIAG EXTERNAL is available for
DTC 16s and DTC 48s only.
Security level: 2.
Syntax
EXT[ERNAL] dtcnum,cardnum,portnum
Parameters
dtcnum The number TermDSM associates with a particular
DTC. The DTC command lists each DTC with its
assigned number. This list is also printed when you
make a mistake while typing in a DTC number.
cardnum Number of the interface card within the DTC to which
the device is connected. The cards are numbered from
zero beginning at the bottom of the DTC.
portnum Number of the port on the interface card. As you face
the back of the DTC, the ports are numbered from zero
beginning at the left of the board.
Description
When this subcommand is entered, the following question is displayed
on the terminal:
Do you want to stop looping if an error is found (yes/no)?
If the answer is yes, the series of loopback tests will stop if an error is
encountered. For example, you specified you want the loopback test to
run 10 times and an error is encountered in the third test. If you
answered yes to the above question, the remaining seven tests will not
be run. If you answered no, all 10 loopback tests will be executed
regardless of the results of each test. The following is then printed on
the terminal:
Please put a loopback hood on the Port, before answering
the “How many times?” question. (TDSM 113)
How many times do you want to repeat this operation?
At this time, go to the DTC and connect a loopback hood to the port.
Then return and enter how many times you want to run this diagnostic
function. Enter a number between 1 and 65535. The following is then
displayed:
Type CONTROL_Y to stop the looping.