Teledyne LeCroy PC_AT 200 - Manual (Page 4)

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OPERATION
Using these Active Extender boards is no different than using a regular
extender board. However, the extra features that these boards have to offer,
are explained below:
ON-OFF
To insert or remove any UUT into and out of the Active Extender, make
sure that the Active Extender is turned Off, if the PC power is to stay
on. There are three ways to turn the Active Extender power On and Off.
1) The mechanical toggle switch. 2) External control signal connected to
JP8. 3) By software commands (see details in that section).
External control can be used if remote controlling is desired for turning
the power On and Off. Leave the mechanical switch in the Off position,
then use a CMOS or TTL level signal to control turning the power On, via
JP8. The left connector of JP8 is ground and the right connector is the
control signal. A Low level, less than 1.5V will turn the switch On.
When the power is turned Off, +5V to the UUT becomes less than 3.7V, all
signals become isolated between the bus and the UUT.
NOTE: If you are running software that relies on a response from the
UUT, do not turn Off the Active Extender board, unless the handshaking
has taken place. Otherwise you may experience a system hang-up. It may
be a good practice to stop the software from running, before isolating
the power and the signals to the UUT.
POWER-ON RESET
Each time the Active Extender board is turned Off and then On, a reset
signal will be generated from the extender to the UUT automatically. The
duration of this reset is about 180 milliseconds. The reset to the UUT
is also activated every time there is a reset from the bus.
BANK SWITCHES
In a normal operation, the bank switches should be left in the closed
position. In this case when the power to the extender is turned On, all
of the bus signals will be active to and from the UUT. However, when
there is a problem with the signals from the UUT, the signals can be
activated in a smaller group. The bank switch 1 (switch closest to the
Red LED D2) controls U1 (bus signals A1-A10), bank switch 2 (second
switch closest to the RED LED D2) controls U2 (bus signals A11-A20).
Therefore bank switches 1-5 control signals on the A side and the bank
switches 6-10 control the signals on the B side. Switch numbers 1-10
correspond on a one-to-one to U1 - U10.