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9-2SectionBoard Replacement
124
Serial com-
munications
mode
RemedyCauseI/O memoryStatus
information,
etc.
Indicator
status
Host Link,
slave-initiated
communica-
tions
The COMMj
indicators are
flashing, but
there is no re-
sponse from
the host.
A transmis-
sion error
has not been
detected at
the host.
--- There is a hard-
ware error in the
reception circuit.
Conduct a loopback test
in serial communications
mode to check the trans-
mission lines. If an error
occurs during the test, re-
place the Serial Commu-
nications Board.
--- Cables are incor-
rectly wired.
Check the wiring and cor-
rect.
--- There is a hard-
ware error in the
reception circuit.
Adapters such as
the NT-AL001-E
are incorrectly
wired or set.
Conduct a loopback test
in serial communications
mode to check the trans-
mission lines. If an error
occurs during the test, re-
place the Serial Commu-
nications Board.
--- --- Check the program at the
host. When unsolicited
communications are used
with Host Link mode,
there must be a response
returned from the host for
every command sent from
the Serial Communica-
tions Board.
Communications
parameters and
baud rate settings
in the PC Setup do
not correspond with
the settings at the
host.
The communica-
tions conditions
and baud rate do
not match the set-
tings at the host.
Reset the parameters in
the PC Setup and at the
host correctly.