IEEE-488 Reference
5-25
With the Manual control source selected (:TRIGger
:SOURce MANual), the instrument will wait until the front
panel STEP key is pressed. Note that the Model 7001 must
be taken out of remote (press LOCAL key or send LOCAL
707 over bus) before it will respond to the STEP key. The
:SYSTem:PRESet command also selects the Immediate con-
trol source.
With the Bus control source selected (:TRIGger :SOURce
BUS), the instrument will wait until a bus trigger is received
(GET or *TRG). With the External control source selected
(:TRIGger:SOURCE EXTernal), the instrument will wait
until an input trigger (via EXTERNAL TRIGGER connector
on rear panel) is received. With the Trigger Link control
source selected (:TRIGger:SOURce TLINk), the instrument
will wait until an input trigger is received (via TRIGGER
LINK). With the Hold control source selected (:TRIGger
:SOURce HOLD), the instrument will not respond to any of
the control source events.
After the programmed channel event is detected, the instru-
ment will wait for the programmed Delay to time out. The
:TRIGger:DELay <n> command is used to set the Delay
(where n = 0 to 999999.999 seconds).
The *RST and :SYSTem:PRESet commands set the Delay to
zero seconds.
As can be seen in the flowchart, there are three paths that al-
low operation to loop around the control source. Two of these
paths also loop around the Delay. These three paths are de-
scribed as follows:
1. When the Source Bypass is enabled (:ARM :TCONfig-
ure:DIRection SOURce) and the External or Trigger
Link control source is selected, operation will loop
around the control source on the initial pass through the
Trigger Layer. If programmed to scan another channel,
(channel count > 1), the bypass loop will not be in effect
even though it will still be enabled. The Source Bypass
loop will reset (be in effect) if operation goes back to
Arm Layer 2.
2. Each time the :TRIGger:IMMediate command is sent,
operation will loop around the control source and the
Delay. It is used when you do not wish to wait for a pro-
grammed channel event to occur (or when the Hold con-
trol source is selected).
3. Each time the :TRIGger:SIGNal command is sent, oper-
ation will loop around the channel control source. This
path functions the same as :TRIGger:IMMediate except
that it does not loop around the Delay.
At this point the first (or next) channel in the Scan List will
be scanned (Device Action). When scanning channels, the
previous channel will open and the next channel will close
(break-before-make). Also included in the Device Action is
the internal settling time delay for the relay and any addition-
al programmed settling time delay using the :STIMe com-
mand of the :ROUTe Subsystem (see paragraph 5.13).
After a channel is scanned, an Output Trigger will occur. If
the channel control source is programmed for Immediate,
Manual, Bus or Timer, the output trigger pulse will be avail-
able at the CHANNEL READY connector. If the Trigger
Link control source is selected, Output Trigger action will
occur as follows:
1. If the asynchronous Trigger Link mode is selected, the
output trigger pulse will be available on the pro-
grammed TRIGGER LINK output line.
2. If the semi-synchronous Trigger Link mode is selected
and the Source Bypass is disabled (:trig :tcon:dir acc),
the Trigger Link line will be released (goes high).
3. If the semi-synchronous Trigger Link mode is selected
and the Source Bypass is enabled (:trig :tcon:dir sour),
the Trigger Link line will be pulled down low and then
released.
Note: See paragraph 4.17 for details on using the Trigger
Link.
After a channel is scanned and an output trigger occurs, the
instrument will (if programmed to do so) return to the begin-
ning of the trigger layer to scan another channel. The :TRIG-
ger:COUNt <n> command is used to set the channel count to
a finite value (where <n> = 1 to 9999) or for a continuous
scan of the Scan List (<n> = INF). The :TRIGger:COUNt
:AUTo ON command is used to automatically set the channel
count to the length of the Scan List. The *RST command sets
the channel count to one and the :SYSTem:PRESet com-
mand enables the automatic channel count.
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