Axel AX4000 User's Manual - Manual (Page 15)

Introduction
AXEL Office Server
9
The Ch2 port is associated with the telnet client service. The serial terminal is
automatically connected to whichever host is selected on the Office Server Set-
Up.
The Ch3 port is associated with the tty client service. The badge reader in this
example would be handled by UNIX via a pseudo-terminal. It would be seen by
an application just like a badge reader directly connected via a local serial port.
The Ch4 port is associated with the telnet server. The AXEL TCP/IP AX3000
can open a PICK session at the same time as opening open telnet sessions on
other multi-user operating systems.