IEEE-488 Programming
5-32
3. If the unit is re-triggered while it is still processing a previous trigger, a Trigger Overrun or
Trigger Before Settling Time Expired error occurs, depending on when the additional trigger
occurs. The timing diagrams are shown in paragraph 4.8.2.
4. To trigger the instrument when using the trigger on talk, you must send the talk command
derived from the correct primary address. The factory default primary address is 18. Trigger
on talk does not occur when the Model 708A becomes a talker, but rather as the controller
requests the first byte of data from the unit.
5. Trigger on GET allows the fastest IEEE-488 triggering response.
6. The X character that is sent when programming a trigger on X source triggers the instrument.
Example
PRINT #1, "OUTPUT 18;F0T0X"
' Disable triggers, program trigger on talk.
PRINT #1, "OUTPUT 18;F1X"
' Enable triggers
PRINT #1, "ENTER 18"
' Trigger next setup
LINE INPUT #2, A$
PRINT #1, "OUTPUT 18;F0T2X"
' Disable triggers, program trigger on GET
PRINT #1, "OUTPUT 18;F1X"
' Enable triggers
PRINT #1, "TRIGGER 18"
' Trigger next setup
5.9.21 U — Status
Purpose
To obtain instrument status and system configuration.
Format
Un
Un,s
Un,u
Parameters
n = 0
Send machine status word.
n = 1
Send error status word.
n = 2,s
Output setup “s” (0-100) with present G format.
n = 3
Send value of RELAY STEP pointer.
n = 4
Send number of slaves.
n = 5,u
Send ID of each card in unit “u” (0-4).
n = 6
Send longest relay settling time.
n = 7
Send digital input of unit.
Description
Overview
By sending the appropriate U command and then addressing the instrument to talk as with nor-
mal data, you can obtain information on machine status, error conditions, and other data.
U0 Machine status word
The format of U0 is shown in Figure 5-17. The letters correspond to modes programmed by the
respective device-dependent commands. Returned values correspond to the programmed
numeric values. The values shown in Figure 5-17 are the default values.
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Summary of Contents for 708A
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