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Troubleshooting Section 11-3
Note The System Setup cannot be changed unless the power supply is cycled, the
Board or Unit is restarted, the port is restarted, or the STUP(237) instruction
is executed. Refer to 1-7 Comparison to Previous Products for details.
Host Link,
slave-initiated
communica-
tions
The SD@ and
COM@ indica-
tors are flash-
ing, but there is
no response
from the host.
A transmis-
sion error has
not been
detected at
the host.
--- A hardware error
has occurred 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,
replace the Board or Unit.
--- 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,
replace the Board or Unit.
--- --- 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 Board or Unit.
CIO Area words n +
5/n + 15 (port set-
ting status in Setup
Area settings) do
not correspond with
the settings at the
host.
The communica-
tions conditions and
baud rate do not
match the settings
at the host.
Reset the parameters in
the System Setup and at
the host correctly.
Serial commu-
nications
mode
Indicator
status
Status
information,
etc.
CIO Area Cause Remedy
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