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P74x/EN CM/Na7
(CM) 10-18
Providing all connections are correct and the software is working correctly, observe that the
[1552 Loopback Status] cell that is located within the INTERMICOM COMMS displays "OK".
Set [1540 Ch Diagnostics] within INTERMICOM COMMS to "Visible".
To test the InterMiCOM enter any test pattern in the [1551 Test Pattern] cell by scrolling and
changing selected bits between "1" and "0". The entered pattern will be transmitted through
the software and/or hardware. Check that the [1502 IM Output Status] cell matches with the
applied 'Test Pattern'. Also check that all 8 bits in the [1501 IM Input Status] cell are zero.
Check that the Channel Diagnostics status is displaying:
[1541 Data CD Status]
[1542 FrameSync Status]
[1543 Message Status]
[1544 Channel Status]
[1545 IM H/W Status]
To simulate a hardware error, disconnect pin 1. The [1541 Data CD Status] will indicate
"FAIL". Restore pin 1 connection. Observe that status reverts to "OK". To simulate a channel
failure, disconnect the link between pins 2 and 3. The [1542 FrameSync Status], [1543
Message Status] and [1544 Channel Status] will all display "FAIL".
Note that [1545 IM H/W Status] cell will remain 'OK'. If displaying "Absent", it means that the
rear communications card that includes EIA(RS)232 InterMiCOM is either not fitted or has
failed to initialize.
Alternatively set [0F13 Test Loopback] cell to 'Internal' and repeat the 'Test Pattern' test as
described above. In this mode it is not necessary to make wiring changes.
4.2.8.6
Loopback removal and establishing service condition
Once the above loopback tests are completed, switch the InterMiCOM channel back in to
service by setting the [1550 Loopback Mode] to "Disabled" and restoring the Tx and Rx
connections.
The following checks can be made if the remote end is actively communicating, if this is not
the case then a comprehensive test cannot be performed until the two ended system is
CM
established.
Observe that the amber Alarm LED and a LCD alarm message, "IM Loopback" are not
present. Check that the [1502 IM Output Status] cell pattern at the local relay matches with
the [1501 IM Input Status] at the remote end and vice versa.
Further checks will be necessary to ensure that the communications between the two relays
in the scheme are reliable. To facilitate this, set the [1520 Ch Statistics] cell "Visible" and
view a list of channel statistics and diagnostics available in the 'INTERMiCOM COMMS'
column. The Rx count for Direct, Permissive and Blocking signals (subject to setting) will
rise rapidly in proportion to Baud rate setting, whilst the Rx count for "NewData" and
"Errored" and the percentage of "Lost Messages" must remain close to zero. Also, all status
indications (see above) must display "OK". That would mean that the comms are of a good
quality and that the EIA(RS)232 InterMiCOM has been successfully put back in service.
Record all statistics in the Commissioning Test Record provided below.
OK
OK
OK
OK
OK
Commissioning
MiCOM P741, P742, P743
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