Number of codes Some codelocks have one code per relay, but have several relays. Access control codelocks will have thousands of codes with only one output.
Number of outputs each output may have a different function. That might be the sameaction but at different times of the day
Code editing If you are expecting delivery drivers or trademen you do not know, it is good security to change the codes regularly. Some codelocks allow access codes to be changed remotely. GSM and IP systems use an app.