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3
Switch/Load Unit and Plug-In Cards
Table 3-6 J102 Signal Definitions
+12Vdc, -12Vdc Supply
Spare Supply
DAC1
DAC2
Digital In 0 - 7
Open Drain Out 0 - 7
Spare_DigOut
Fixture ID (0 - 7)
Isense+ (1 - 4)
Isense- (1 - 4)
Power Bus Sense 1 - 4
Gnd
3-18
+12V and -12V from the Switch/Load Unit Power Supply. The +12V supply can deliver
2.5A, the -12V supply can deliver 800mA.
Connection for a user installed power supply not included in the standard system. Refer
to Connecting an Auxiliary Power Supply in the Switch/Load Unit User's Manual for
details.
The Switch/Load Unit provides two 14-bit channels of DAC which supply ±16 volts at 10
mA each.
The Switch/Load Unit provides 8-bits of digital input, 8-bits of open drain digital output,
and 8-bits of TTL-level digital output (Spare_DigOut). There is no handshaking
capability.
The Fixture ID lets you configure a unique ID for each mass interconnect fixture and
read it back. ID sent as TTL level bits.
These lines connect to the current sense bus on the Switch/Load Unit backplane. These
lines are used for sensing current on a selected load card channel. The 8-channel and
16-channel load cards are designed to connect to the current sense bus. Each load card
channel's current sense lines are multiplexed so that on each card only one channel at a
time can be connected to the current sense bus. The current sense lines and the slots
they connect to are:
Isense lines (1) connect to Switch/Load Unit slots 1 - 5.
Isense lines (2) connect to Switch/Load Unit slots 6 - 10.
Isense lines (3) connect to Switch/Load Unit slots 11 - 15.
Isense lines (4) connect to Switch/Load Unit slots 16 - 21.
Two or more sets of the above lines can be bussed together select from toggle switches.
Refer to
page 12
for details.
The remote sense lines for the power supplies connected to power buses 1 - 4.
Chassis ground of the Switch/Load Unit.
E6198B Switch/Load Unit User Manual
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