Symbol Technologies MC9000-K - Manual (Page 268)

MC9000-K/S for Embedded Windows® CE .NET Product Reference Guide 7-12
Setup
The cradle requires a dedicated port on the host computer.
Figure 7-6. Single Slot Serial/USB Cradle, Power/Serial/USB Connections
Select either serial or USB for communications, do not connect cradle to both
serial and USB ports.
USB Cable
USB Port
USB Port
Serial Port Serial Port
DC Cable
AC Line Cord Power Supply
Power Port Serial Cable