Fault Codes DTC & Troubleshooting

Table Of Contents
2 TROUBLESHOOTING
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RS-232C, RS-422
LQE560
LQE565
The TX and RX indicators (LEDs) do not come on normally.
Check if: What to do
The MODU No. switch is set correctly. If not, set it correctly.
The RS-232C or RS-422 module’s parameters
are set correctly.
If not, set them correctly.
The cable is connected correctly. Check the cable connections and, if a
connection error is found, correct it.
The cable connector is connected loose or
about to fall off the mating connector of the
RS-232C or RS-422 module.
If true, insert the connector completely
into the mating connector.
The ERR indicator (LED) is lit.
Check if: What to do
An RS-232C or RS-422 error is recorded in
the error log.
If true, troubleshoot according to the
instructions given under “4 ERROR
LOG INFORMATION.”
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