Intermec 6640 Technical Reference page 34

CMOS Setup
2-8 6640 Mobile Computer Technical Reference
Serial Port (COM1):
"
(Default is enabled)
I/O address
Serial Port (COM2):
"
Scanner Power:
"
(Default is disabled)
Serial Port (COM3):
"
(Read Only)
Serial Port (COM4):
"
(Read Only)
Serial Port (Pen):
"
(Read Only)
SECTION 2
Base