1. My CUL was initialized with X21 to receive data but there is no
output. I am sure that there is traffic on air. CUL responds as expected to
other commands like V. Is my CUL defect?
Please check the response to command
C35. Reception mode is
turned on if the return value is
13. If reception mode is
enabled but nothing is received, the EEPROM data is probably corrupt. You
can reinitialize the EEPROM data with the default setting from program code
with the command e (which will result in a reboot of the CUL).