Operation
4-12
Use the U1 — error status command (paragraph 5.9.20) to
retrieve the cause of the error.
After the time required for transferring relay data has
elapsed, the Model 708A is able to process another trigger. If
a trigger is received before the programmed setting time has
elapsed, a not settled error will result. Use the U1 — error
status command (paragraph 5.9.20) to retrieve the cause of
the error.
Figure 4-13 shows an example setup change and a timing
diagram of the READY (for trigger) pulse and a high true
MATRIX READY pulse when the Model 708A is processing
the trigger. The status of these signals is available in the
serial poll byte (see Section 5). This timing is for setups with
no make/break or break/make rows.
When either make/break or break/make operation is
selected, the Model 708A switches through an intermediate
setup to ensure proper relay operation. If only make/break
rows are selected, the Model 708A performs the following
steps:
1. Closes crosspoints in make/break rows yielding an
intermediate setup.
2. Opens crosspoints in make/break rows and opens/closes
crosspoints in don’t care rows yielding the desired setup.
X
X
X
X
1
2
3
1
2
3
State :
Don't Care
Actions :
Setup N
Commands
NA2
CA3
Open Don't Care
Close Don't Care
Setup N + 1
A
A
A
A
A
AAAAAAAA
AAAAAAAA
A
A
A
A
A
A
A
A
A
Setup Data
Shift
Programmed
Settling Time
TRIG
OVERRUN
Additional Trigger Is Processed
NOT SETTLED Message
Ready
Matrix
Ready
Relay
Settling Time
Additional Trigger
not Processed
Figure 4-13
Timing without make/break and break/make rows
4.8.1 Sources
The programmed trigger source provides the stimulus to
increment to the next stored setup. Possible trigger sources
include:
• External trigger pulse — An appropriate pulse, applied
to the EXTERNAL TRIGGER INPUT jack on the rear
panel, provides the trigger stimulus. The power-up
default is set for external triggering.
• IEEE command triggers — IEEE-488 GET, X, or talk
commands provide the stimulus when the appropriate
source is selected.
Use the T — trigger command to select the trigger source
(paragraph 5.9.19).
4.8.2 Overrun conditions
Once the instrument is triggered, it begins transferring relay
setup data from mainframe memory to the cards. If a second
trigger is received while the unit is still transferring data, a
trigger overrun condition will occur. In this case, the second
trigger is not processed, and the unit’s ERR LED illuminates.
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