WHAT IS IT?
It is an additional Bus Expansion port for the Smarty Touch


WHAT DOES IT DO?
When installed to the Smarty Touch's under-dash controller, it
allows the communication with the ECM over two ( 2 ) distinct
CAN Bus Channels AT THE SAME TIME. The Usual OBD II
plug / bus AND a secondary under the Hood service bus used by
Cummins for the Communication with external modules such as
the VGT Turbo, Oxygen Sensors, etc...