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VMI / Nov 2016
VIRTUAL MIXER INTERFACE
Virtual Mixer Interface
Introduction
The WheatstoneVMI Virtual Mixer Interface is a 1RU rack mountable unit that emulates
a Wheatstone E-Series Digital Control Surface. It can be used in a Wheatstone Gibraltar
system (TDM-based), a Wheatstone Wheatnet system (also TDM-based), or a Wheatstone
WheatNet‑IPsystem(IP‑based).TheVMIunitispre‑conguredatthefactoryforthetype
of system it will be used with, and in particular E-Series Model that it will emulates. The
total number of faders emulated is also set at the factory.
In an IP based system, the VMI needs only an Ethernet connection to the system. In a
TDM based system, the VMI will need an AT LINK connection, in addition to an Ethernet
connection. The AT LINK connection needs to be connected to either a DSP Port on an
E-SAT, or to the MIXER Port on an M-DSP (Micro Digital Signal Processor). In either
case it is important that the connection is made to the correct port in the system.
WARNING! The VMI unit should NOT be opened for any reasons! The unit has no
user-serviceable parts inside! If you have an issue with the unit contact Wheatstone
Support to arrange an RA for repair service.
Host Controller (HC-3)
The host controller card used in the VMI incorporates a PC/104 computer mounted on
theHC‑3PCB.ThehostcomputerutilizesRAM,aashdisk(emulatedasIDEdrive),
andanEthernetport.ThereisnotraditionalHardDiskDrive.AVideoportissuppliedto
the DB-15 connector on the rear of the VMI.
The purpose of the host controller is to provide control of the VMI. The HC‑3
communicatestotheXPointCongurationPCviaTCP/IPoverEthernetviaastandard
Ethernet switch connection to a switch. Additionally, it communicates with the TDM sys-
temviatheATLINKconnection.
Hardwareandsoftwareconguration,aswellasrealtimecrosspointinformation,is
savedinnon‑volatilestorageontheHC‑3cardandisrestoreduponpoweruporreset.This
congurationinformationprovidesdetailstothehostapplicationrunningontheHC‑3,
suchasthespecicaudiohardwareavailable.
HC-3 BIOS Settings/Format/IP Address
BIOS Setup and formatting of the Host CPU is completed prior to the testing of your
VMI at the Wheatstone factory. There are no user adjustable settings. Additionally the
VMI ships with the host controller IP address set. Stand–alone systems NOT interfaced to
an existing network require no IP address changes.