Serial port mapping
See the table below to find out how the physical RS485/RS232 serial port lines are mapped into Linux ports within /dev/.
Axon
Alternatively, all serial ports with N (eg. /dev/ttyNS0) mentioned below are also accessible via /dev/extcomm/Y/X, where Y is the number of section, and X is the number of the serial port. X and Y are counted from 0.