Model 7002Switch System Instruction Manual - Advanced Test ...

Trigger subsystemIEEE-488 ReferenceDefaultsPower-upSaved power-on setup*RSTIMMediate (all layers):SYSTem:PRESet IMMediate (Arm Layer 1 and Arm Layer 2),MANual (TRIGger Layer)Querycommands:SOURce?Short-form formats:Response message:Query programmed control source.:arm:sour?:arm:lay2:sour?:trig:sour?HOLD, MAN, IMM, BUS, TLIN, EXT or TIMDescriptionThese commands are used to select the event control source for the specified layer. With HOLDselected, operation will stop and wait indefinitely in the specified layer. While in HOLD, operationcan be continued by sending the :IMMediate command or the :SIGNal command. Keepin mind however, that if the layer count >1, HOLD will again be enforced when operation loopsback around.With IMMediate selected (do not confuse :SOURce IMMediate with :IMMediate), operationwill immediately pass through the specified layer.A specific event can be used to control operation through a layer. With BUS selected, operationwill continue when a GPIB trigger (GET or *TRG) is sent. With TLINk selected, operation willcontinue when an input trigger via the Trigger Link is received. With EXTernal selected, operationwill continue when an External Trigger is received.A TIMer event is available for Arm Layer 2 and the Trigger Layer. With TIMer selected for thespecified layer, the event occurs at the beginning of the timer interval, and every time the timertimes out. For example, if the Trigger Layer timer is programmed for a 30 second interval, thefirst pass through the Trigger Layer control source will occur immediately. Subsequent triggerevents will then occur every 30 seconds. The interval for the timer is set using the :TIMer command.This timer interval is independent of the :DELay setting.Programmingexample10 OUTPUT 707; “:trig:sour imm; sour?”20 ENTER 707; A$30 PRINT A$40 ENDLine 10Line 20Line 30Sets the channel control source to immediate, and then queries the programmed controlsource.Addresses the 7002 to talk.Displays the programmed channel control source (IMM).5-139