chapter describes analog I/O pin-outs for the XMP-PCI, XMP-CPCI-6U,
and XMP-CPCI-3U controllers. The first section of this chapter
describes connector hardware. The second section of this chapter
describes the actual I/O configuration, including pin-outs, organized
by form factor.
I/O is described in Chapter 5
of this manual.
Analog I/O Hardware
analog XMP controller's I/O hardware type can be easily identified
by examining the connection between the XMP controller and drive:
Cabling and Terminal Block
and XMP-CPCI use the same 68-pin cable for all front panel (VHDCI)
Terminal Connector Blocks
VHDCI connectors used with XMP controllers are 68-pin types.
Corresponding to this, terminal blocks having 68 terminals per
side are preferred. MEI recommends the STC-136, which can accommodate
up to two cables. These use screw terminals for analog wiring.
Many "controller problems" can be traced to faulty
wiring. As with all analog wiring, it is the user's responsibility
to verify that wiring is correctly connected per specifications
BEFORE applying power. Verify the following when wiring terminal
the Terminal Block
all wiring is clearly and correctly labeled and color-coded
for easy identification. Assembly personnel should have
clear and concise wiring diagrams available when wiring.
wires to terminal blocks by referencing terminal numbers,
NOT by a wire's placement relative to another wire.
wires appropriately: removing too much insulation will leave
bare wires exposed and susceptible to short-circuits; removing
too little insulation will prevent electrical contact inside
the lug. Do not pinch or crimp wires when stripping--they
not insert wire above a terminal block's lug. When the lug
is tightened, it will not close on the wire, failing to
make contact. Verify that debris does not enter the lug
with the bare wire; it may prevent complete closure of the
that lugs are tight. Remove all loose wire strands.
all terminal blocks with damaged traces.
that connector pins are straight BEFORE attempting to connect
cables. Bent pins can short-circuit, or ruin a connector!
If connectors resist, do not force them. Check for problems
electrostatic discharge (ESD) precautions while handling
connectors and terminal blocks. High-level ESD can damage
circuitry over cables.