Emerson SCKM120 User Manual page 22

When you power up your computers, the KM emulates both a mouse
and keyboard on each port and allows your computers to boot
normally. You should be able to move the mouse cursor on the
primary display connected to computer #1.
Check to see that the keyboard and mouse are working properly on
each computer.
Repeat this check with all occupied ports to verify that all computers
are connected and responding correctly.
If you encounter an error, check your cable connections for that
computer and reboot. If the problem persists, please refer to the
Troubleshooting section in this User Manual.
DPP Installation (applicable models)
4.
In case computer and product support DPP functionality, such as
user authentication smart card reader, do the following:
1. Connect USB device, such as smart card reader, to DPP port
on product console
2. Connect DPP input port on product to any free USB port on
computer using a USB cable.
Note: Do not connect the USB cable if DPP functionality is
not needed for that computer.
If only some of the computers use DPP functionality, such as user
authentication, make sure that computer #1 is connected to the USB
device. If needed, switch channels/computer mapping to create this
configuration.
When product is powered ON and connected USB device is qualified
and ready for use, the DPP status LED will illuminate steady green.
In case the connected USB device cannot be detected by the secure
product, the DPP status LED will not illuminate at all.
22
Section 4 - Operation
The USB device will be detected only if it is fully compliant with USB
1.1 or USB 2.0 standard and is included in the list of recognized USB
devices defined by the administrator when configuring DPP
functionality.
Possible reasons for USB device not being detected:

Non-standard USB device

Device only operating in USB 3.0 mode

Failed USB Device
In this case you will have to use a different USB device.
If the device is detected but is not authorized, the device will be
rejected for security reasons. This will be indicated by DPP status LED
flashing green.
Smart card readers and CACs are included in the authorized USB
devices list by default.
2/4 PORT SECURE KM: SCKM120; SCKM140; SCKM145
SCKM120; SCKM140; SCKM145
SM80NU-3 SM80NU-3 SM80NU-3