ADLINK EOS-1200 - Manual (Page 94)

82 BIOS Setup
EHCI Hand-Off
Enables BIOS support on EHCI Hands-Off feature. The default
option is Enabled.
B.2.9 Super I/O Configuration
Serial Port 1 to 4 Configuration/Serial Port 5 Configuration
(Valid when PCB is changed)
Options in this configuration can enable/disable the port, select
a port type (RS-232/422/485) for Serial Port 1 and 2 only, or
change the port settings (address)