VXI EX7000 - Manual (Page 37)

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EX7000 Series Web Page Operation 37
Part Number Bank 0 Bank 1 Bank 2
-000 Open-collector Open-collector Open-collector
-001 TTL Open-collector Open-collector
-002 TTL TTL Open-collector
-003 TTL TTL TTL
CAUTION
It is imperative that TTL banks only have TTL devices connected to them. Connecting an
open-collector device to a TTL port will result in damage to the RDB and, potentially, to
other equipment in the test system. Failure to comply with this warning will result in voiding
the manufacturer’s warranty.
R ELAY A CCESS & C ONTROL
F IGURE 5-3: R ELAY D RIVER B LOCK D IAGRAM
When asserted, the relay drive lines will sink the necessary current through the coils, effectively
switching the relay. The user can program the relay settling time for each RDB.
The relay control can be operated in two modes: Pulse and Continuous
Continuous Mode
Connecting non-latching devices to any bank of the RDB will dictate that bank must be operating
in continuous mode. Commanded by software, the latch signal driving the FET will change state
to activate/deactivate FETs and continuously stay in that state until the next command. All Relay
Control Drive bits within a bank will change state at the same time. Continuous mode requires a
power supply capable of sustaining the high-current requirement. The user must allow an
appropriate amount of time after the Relay Control Drive bit changes state for the relay to settle.
This is typically between 10 ms to 30 ms.