3-14 E6198B Switch/Load Unit User Manual
3 Switch/Load Unit and Plug-In Cards
Backplane Connectors
The following connector descriptions are referenced to
Figure 3-9.
T1-T14 are the Switch/Load Unit power supply connectors.
The supply provides the required +5 volts and ±12 volts for
powering the backplane and Load Cards. These power supply
lines are protected by fuses.
J102 connects the signals that are cabled between the
Switch/Load Unit and the mass interconnect. These signals
include:
Eight-bit fixture ID pins allow the user to configure a
unique ID for each mass interconnect fixture and read it
back. Address 0 of the backplane is used for the fixture ID
and to read back the status of reset and busy state of the
backplane.
Digital In/Digital Out eight bits each (TTL level).
Open Drain Outputs eight bits each.
Four pairs of current sense busses correspond to the
current sense pairs from slots 1-5, 6-10, 11-15, and 16-21.
These busses may be connected together to form a single bus,
or split into independent current sense busses using
Switches S3A-S3F on breakout board(Standalone) are shown
in their factory default state of being bussed together. See
Chapter 3 for additional information and details for when
you should split the busses.
Four remote power bus sense pins remotely sense the
power busses at the UUT. Remote or local sensing is set by
jumpers J3 for power bus PB1-PB4 respectively. The factory
default is to sense the power supplies as remote.
DAC 1 and DAC 2 outputs.
J201-J221 are the Load Card slot connectors for Load Card
slots 1-21, respectively. The top half of each Load Card
connector is used to provide slot power, address, data, and
control lines. The bottom half of each connector is used to
connect the power busses to the Load Cards.
J801 and J802 provide the high power connections to power
busses PB1-PB4. Three supplies with a common connection
to PB1 or two independent supplies can be configured on the
four power busses. Bulk bypassing between power busses
may be desirable in certain applications.
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