Omron CQM1H-SCB41 Operation Manual page 141

Troubleshooting
Serial commu- Indicator
nications status
mode
Host Link, The COMM@
slave-initiated indicators are
communica- flashing, but
tions there is no
response from
the host.
126
Status I/O memory
information,
etc.
A transmis- ---
sion error has
not been
detected at
the host.
---
---
---
Communications
parameters and
baud rate settings in
the PC Setup do not
correspond with the
settings at the host.
Cause
There is a hard- Conduct a loopback test in
ware error in the serial communications
reception circuit. mode to check the trans-
mission lines. If an error
occurs during the test,
replace the Serial Commu-
nications Board.
Cables are incor- Check the wiring and cor-
rectly wired. rect.
There is a hard- Conduct a loopback test in
ware error in the serial communications
reception circuit. mode to check the trans-
mission lines. If an error
Adapters such as
occurs during the test,
the NT-AL001-E are
replace the Serial Commu-
incorrectly wired or
nications Board.
set.
--- 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.
The communica- Reset the parameters in
tions conditions and the PC Setup and at the
baud rate do not host correctly.
match the settings
at the host.
Section 9-2
Remedy