Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
Advanced Topics 8-43
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Receive a signal from another instrument in the VXI chassis (needs to go to the T940
Primary Sequencer):
o
External Start and/or Stop
o
External Jump
o
External Halt, Pause or Resume
•
Trigger another instrument in the VXI chassis. Possible signal choices within the
T940 are:
o
A sync pulse
o
A Seq. Flag
o
An Aux. Input
o
Idle Active
o
Seq. Active
o
A Channel Test
Normal Operation:
•
For inter-module communication, the “active high” and “active low” state of the
backplane bus is handled automatically.
•
For communications with other instruments, the “active high” or “active low” state of
the bus must be considered when:
o
Receiving a signal from another instrument
o
Providing a signal to another instrument
•
The signals driving out onto these buses or coming in from these buses can be
inverted.
Normal Operation Example:
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To do a Jump Test on an Aux. Input located on a Slave Sequencer:
o
Select the TRG Bus to be used and select the Aux. signal to drive it.
o
Invert the output, if the Aux. signal is active low.
o
On the Master, select the same TRG Bus signal and use a “High” or “Rising
Edge” test condition.
•
To do a Jump Test on an input Channel (Channel Test):
o
Select the Channel Test to be used (1 of 4) on the Master or Slave
Sequencer which covers that channel.
o
Pick the desired channel and unmask the channel test for that channel.
o
Set the expect level for the channel to be the level desired for a trigger.
o
Select the TRG Bus to be used and select the Channel Test signal to drive it.
o
On the Master, select the same TRG Bus signal and use a “High” or “Rising
Edge” test condition.
Advanced Operation Examples:
•
To do a Jump Test on the OR of several Channels: