6-2SectionDiagnostic Functions
95
6-1-3 Using Monitor Unit for Offline Test
The
Monitor Unit can be used to test communications between the R/W Heads
and the DCs with the ID Controller disconnected from the host computer. Use
this test to check the installation positions and speeds prior to performing test
operations (see
Appendix C Offline Test and Auto Read/Auto Write
).
R/W
Head
DC
Monitor Unit
Read,
write, auto read, and auto write operations can be performed in the Moni
-
tor
Unit test mode. See
Section
4 Monitor Unit Operation
and
Appendix C Offline
Test and Auto Read/Auto Write
for operation methods.
6-1-4 Communications Test with Host Computer
The
test command can be used to test communications between
the ID Control
-
ler and the host computer. Perform this test to check cable connections and
computer
processing operations prior to performing the full system test opera
-
tion.
W
rite a simple
communications program on the host computer to send the
test
command (TS).
If the communications system is normal, the ID Controller
will return the test data it received without change.
Host
computer test command
T
est data: 262 characters maximum
Host computer response
T
est data response
TSxxx …… xxx∗
TSxxx …… xxx∗
(1) Send
(2) Receive
6-2 Diagnostic Functions
The
ID Controller has various diagnostic functions to deal with abnormal
situa
-
tions
and to reduce system down time. If an abnormality occurs, the details can
be read by mounting the Monitor Unit.
6-2-1 Abnormalities
Abnormalities
detectable by the ID Controller
are generally classified into opera
-
tion termination abnormalities and operation continuation abnormalities.
When
abnormalities
occur in the ID Controller hardware, CPU operation stops,
and
the ERROR and ST
OP indicators light. When this happens, the error output
goes
on. Also, if the external stop input reset is turned on, the CPU stops, and the
STOP indicator lights. When this happens, the error output goes off.
Operation Termination
Abnormalities
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