Determining the Input Threshold Level, Inppol Norm | VXI VT1538A

Determining the Input Threshold Level

Note

•Channels in <ch_list> must be input configured channels

To determine a channel’s input threshold level, use the command: INPut:THReshold:LEVel? (@<channel>)

Because the E1538 rounds <level> to the nearest multiple of 0.375, the returned value can be different from the value sent.

•<channel> must specify a single input-configured channel.

•INP:THR:LEV? returns a numeric value between -46 and +46. The C-SCPI type is int32.

To query the threshold level on the second channel at SCP position 4 send:

INP:THR:LEV? (@133)	query 2nd chan on SCP pos. 4
enter statement here	returns threshold value

Set Input Logic Sense Use INPut:POLarity NORMal INVerted,(@<ch_list>) to configure input channel logic sense. The operation is as follows:

INP:POL	NORM	input voltage greater than the threshold level sends a
		value of 1	(one) to the algorithm channel specifier.
INP:POL	INV	input voltage greater than the threshold level sends a
		value of 0	(zero) to the algorithm channel specifier.

To configure channels 40 to 43 to sense low input as logic 1

INP:POL INV,(@140:143)

Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 13

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VXI VT1538A user manual Determining the Input Threshold Level, Inppol Norm

Contents

VT1538A VXI Technology, Inc Introduction Support Resources User’s and Scpi Programming Manual Page About this Manual Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Introduction Identifying the Plug-on Important Switch Location and Example Settings Setting Configuration Switches Connecting To The Terminal Module Installation E1419A Option 11 Terminal Module Connections Recommended Signal Connections Recommended Connections and Voltage Limits Input and Output Characteristics E1538A Input/Output Characteristics VRS Mode Input Operation SCP Channels 0 & 1 only Shows the VRS mode input characteristics Programming With Scpi Commands Setting the Input Threshold Level Configuring I/O Direction Inppol Norm Determining the Input Threshold Level To set channels 40 through 43 to input digital states Reading Static Digital State Init SENSDATACVT? @44 Totalize Positive or Negative Edge State Changes About Period Frequency Measurements SENSDATACVT? @45 SENSDATACVT? @45 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Sensfuncquad 0,@148,149 Sense Quadrature Position RPS Sense Rotational Velocity Example of Rotational Velocity Sense Output Static Digital State Controlling Output Polarity Variable Width Pulse Per Trigger Variable Width Pulse Train PWM Variable Frequency Fixed Width Pulse Train FM Variable Frequency Square-Wave Pulse Train Rotationally Positioned Pulse Output Rotational Pulse Command Usage Algupdate Init RST Sensfuncrvel 12,MISS,@140 Example of variable position, preset width Variable Position, Width Preset by Time Example of variable width by angle, preset position Fixed Position, Variable Width by Angle Example of variable width by time, preset position ALGSCALAR’ALG1’,’Width2’,.010 Stepping mode values Stepper Motor Control Use the command Sensfuncvolt @100 Full Step Mode, Full and Half Speed, 4-Channel Page RST and *TST important Command Syntax For newer Units only Scpi Command Reference Command Syntax For newer Units only Discussed INPutPOLarity? INPutPOLarityParameters Comments INPutTHResholdLEVel? Level can be set to a resolutionINPutTHResholdLEVel Send with VXIplug&play Function hpe14XXcmdReal64Q OUTPutPOLarityOUTPutPOLarity? SENSeFREQuencyAPERture SENSeFREQuencyLIMitLOWer Related Commands SensfreqaperSENSeFREQuencyAPERture? Init SENSeFUNCtionCONDition Related Commands INPutPOLaritySENSeFREQuencyLIMitLOWer? SENSeFUNCtionPERiod SENSeFUNCtionFREQuency SENSeFUNCtionQUADrature SENSeFUNCtionPWIDth SENSeFUNCtionRVELocity RPS SENSeFUNCtionTOTalize SENSePERiodAPERture SENSePERiodLIMitUPPer SENSePERiodAPERture? Init SENSePERiodMODE SENSePERiodLIMitUPPer? SENSePERiodNPERiods Related Commands SENSePERiodMODESENSePERiodMODE? Send with VXIplug&play Function hpe14XXcmdInt32Q SENSePERiodNPERiods?SENSePERiodRANGeUPPer RST Condition is Send with VXIplug&play Function hpe14XXcmd SENSeTOTalizeRESetMODESENSePERiodRANGeUPPer? SOURceFMSTATe SENSeTOTalizeRESetMODE? Send with VXIplug&play Function hpe14XXcmdInt16Q SOURceFMSTATe? SOURceFUNCtionRPULse SOURceFUNCtionSHAPePULSe SOURceFUNCtionSHAPeCONDition Comments Send with VXIplug&play Function hpe14XXcmd SOURceFUNCtionSHAPeSQUareSOURceFUNCtionSTEPper Relationship of minvel, and maxvel Usage See Stepper Motor Control on SOURcePULMSTATe SOURcePULSePERiod SOURcePULMSTATe? SOURcePULSeWIDTh SOURcePULSePERiod? 33,554,430 to 33,554,430 SOURcePULSeWIDTh?SOURceRPULsePOSitionANGLe Usage SOURceRPULsePOSitionANGLe?SOURRPULseVARType SOURceRPULseWIDThANGLe SOURRPULseVARType? 00000787 to SOURceRPULseWIDThANGLe?SOURceRPULseWIDThTIME SOURceRPULseWIDThTIME? General Specifications Specifications Frequency Measurement Pulse Width Measure Rotational Pulse Source