474-Add-on Modules
Troubleshooting
49
9
Troubleshooting
9.1 General Failures
Diagnosis
Possible reason
Measure
Config.txt
parameter without
function.
Parameter not set or saved.
Write the parameter into
Config.txt
file and save changes.
Start command
#CFG
not set.
Write the start command #CFG into first
line of the
Config.txt
file.
Parameter written incorrectly.
Check correct spelling and capitalization.
Extender module not restarted.
Restart the extender module.
9.2 Add-on Module, Serial Interface
Diagnosis
Possible reason
Measure
Serial device is not
operational.
Settings of the serial interface are wrong.
Check baud rate and general settings.
No serial connection to the source
available.
Check connection via serial cable.
No serial connection to the end device (e.g.,
touch screen, keyboard) available.
Connect serial end device and switch it on.
Check connection via serial cable.
Touchscreen is not
operational.
Hardware handshake.
Adjust serial interface to X-ON/X-OFF
software handshake.
9.3 Add-on Module, Analog Audio
Diagnosis
Possible reason
Measure
CON Unit:
No signal at audio
output.
No audio connection to the audio source
available.
Connect an analog audio source.
Check the connection of the audio cable
between the CPU Unit and the audio
source.
No signal available.
Switch the analog audio source on.
Activate the analog output at the audio
source.
No audio connection to the audio sink (e.g.,
speakers) available.
Connect an analog audio sink and switch it
on.
Check the connection of the audio cable
between the CON Unit and the audio sink.
