IEEE-488 Programming
5-31
Programming notes
The total settling time equals the longest relay settling time of any card in the system plus any
user-programmed settling time. Figure 5-16 shows a timing diagram of the settling times. Addi-
tional timing diagrams are given in paragraph 4.8.2.
Example
PRINT #1, "OUTPUT 18;S5000X"
' Program 5 second (5000 ms) settling time
PRINT #1, "OUTPUT 18;S0X"
' Restore default condition (0 ms)
5.9.20 T — Trigger
Purpose
To select the trigger source.
Format
Tn
Parameters
n=0 or 1
Trigger on talk
n=2 or 3
Trigger on GET
n=4 or 5
Trigger on X
n=6 or 7
Trigger on External Trigger pulse
Default
Upon power-up or after receiving a DCL, SDC, or R0X command, the instrument defaults to T7
(Trigger on External Trigger pulse).
Description
With the trigger command, you can determine the trigger source over the bus or from an external
trigger pulse. A valid trigger increments the Relay Step pointer by one, stopping at 100, and cop-
ies the setup data indicated by the new value to the relays.
Programming notes
1. Duplication of trigger sources allows compatibility with other Keithley IEEE-488 instruction
sets.
2. Disabling triggers before changing the trigger source is a good programming practice.
Figure 5-16
READY and MATRIX READY signal timing
AAAAAA
A
A
A
Shift
Setup Data
Programmed
Settling Time
TRIG
Overrun
Additional TRIGGER
not Proces s ed
Not SETTLED
Mes s age
Additional Trigger is Proces s ed
Ready
Matrix
Ready
Relay
Settling Time
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