VXI VT1538A user manual Configuring I/O Direction, Setting the Input Threshold Level

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Checking the ID of the SCP

To verify the SCP type(s) installed on your VXI module, use the SYSTem:CTYPe? (@<channel>) command.

•The channel parameter specifies a single channel in the channel range covered by the SCP of interest. The first channel number for each of the eight SCP positions are; 0,8,16,24,32,40,48, and 56.

The value returned for the E1538A SCP is:

HEWLETT-PACKARD,E1538A Enhanced Frequency/Totalize/PWM SCP,0,0

To determine the type of SCP installed on channels 0 through 7 send

SYST:CTYPE? (@100)

query SCP type @ ch 0

enter statement here

enter response string

Configuring the Channels

The E1538A has eight digital channels. The Power-on and *RST state is that all input-configured channels sense static digital state (SENS:FUNC:COND), and all output-configured channels output static digital state (SOUR:FUNC:COND). Logical sense is normal

(INP:POL NORM and OUTP:POL NORM).

Configuring I/O Direction

Programming Input Channels

Setting the Input

Threshold Level

Channels are configured for input or output with the I/O direction switches (see "Setting Configuration Switches" on page 6).

This section deals with all aspects of programming input channel functions. Channels are configured for input with the I/O direction switches (see "Configuring Input-Output direction" on page 6). A related error message: 3123,"E1538 OE switch ON conflicts with this command."

The E1538 allows programmatically setting the input threshold level for each input configured channel. The input threshold can be set from -46VDC to +46VDC with .375V resolution. While input polarity is set to NORMAL, an input level higher than the threshold level is considered a logic one, and an input level lower than the threshold level is considered a logic zero. If input polarity is set to INVerted, an input level higher than the threshold level is considered a logic zero and an input level lower than the threshold level is considered a logic one. To set input threshold level use the command

INPut:THReshold:LEVel <level>,(@<ch_list>)

•<level> is a value between -46 and +46 inclusive. The resolution for <level> is 0.375 Volts. The *RST and power-on default for <level> is 1.78 volts.

Note The value sent for <level> will be rounded to the nearest multiple of 0.375 Volts. For instance, 5 would be 4.875, 10 would be 10.125, 9.5 would be 9.375, and 15 would be 15. The INP:THR:LEV? query will return the actual setting.

12 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP

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Contents VT1538A VXI Technology, Inc Introduction Support Resources User’s and Scpi Programming Manual Page Agilent E1538A Enhanced Frequency/Totalize/PWM SCP About this ManualIntroduction Identifying the Plug-on Important Setting Configuration Switches Switch Location and Example SettingsInstallation Connecting To The Terminal ModuleRecommended Signal Connections E1419A Option 11 Terminal Module ConnectionsInput and Output Characteristics Recommended Connections and Voltage LimitsVRS Mode Input Operation SCP Channels 0 & 1 only E1538A Input/Output CharacteristicsProgramming With Scpi Commands Shows the VRS mode input characteristicsConfiguring I/O Direction Setting the Input Threshold LevelDetermining the Input Threshold Level Inppol NormReading Static Digital State To set channels 40 through 43 to input digital statesTotalize Positive or Negative Edge State Changes Init SENSDATACVT? @44About Period Frequency Measurements SENSDATACVT? @45 SENSDATACVT? @45 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Agilent E1538A Enhanced Frequency/Totalize/PWM SCP Sense Quadrature Position Sensfuncquad 0,@148,149RPS Example of Rotational Velocity Sense Sense Rotational VelocityControlling Output Polarity Output Static Digital StateVariable 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 Example of variable position, preset width RST Sensfuncrvel 12,MISS,@140Variable Position, Width Preset by Time Example of variable width by angle, preset position Example of variable width by time, preset position Fixed Position, Variable Width by AngleALGSCALAR’ALG1’,’Width2’,.010 Stepper Motor Control Use the command Stepping mode valuesSensfuncvolt @100 Full Step Mode, Full and Half Speed, 4-Channel Page RST and *TST important Scpi Command Reference Command Syntax For newer Units onlyCommand Syntax For newer Units only Discussed INPutPOLarity INPutPOLarity?Parameters CommentsINPutTHResholdLEVel Level can be set to a resolutionINPutTHResholdLEVel? OUTPutPOLarity? OUTPutPOLaritySend with VXIplug&play Function hpe14XXcmdReal64Q SENSeFREQuencyAPERture SENSeFREQuencyAPERture? Related Commands SensfreqaperSENSeFREQuencyLIMitLOWer Init SENSeFREQuencyLIMitLOWer? Related Commands INPutPOLaritySENSeFUNCtionCONDition SENSeFUNCtionFREQuency SENSeFUNCtionPERiodSENSeFUNCtionPWIDth SENSeFUNCtionQUADratureSENSeFUNCtionRVELocity RPS SENSeFUNCtionTOTalize SENSePERiodAPERture SENSePERiodAPERture? SENSePERiodLIMitUPPerInit SENSePERiodLIMitUPPer? SENSePERiodMODESENSePERiodMODE? Related Commands SENSePERiodMODESENSePERiodNPERiods SENSePERiodRANGeUPPer SENSePERiodNPERiods?Send with VXIplug&play Function hpe14XXcmdInt32Q SENSePERiodRANGeUPPer? SENSeTOTalizeRESetMODERST Condition is Send with VXIplug&play Function hpe14XXcmd SENSeTOTalizeRESetMODE? SOURceFMSTATeSOURceFMSTATe? Send with VXIplug&play Function hpe14XXcmdInt16QSOURceFUNCtionRPULse SOURceFUNCtionSHAPeCONDition SOURceFUNCtionSHAPePULSeSOURceFUNCtionSTEPper SOURceFUNCtionSHAPeSQUareComments Send with VXIplug&play Function hpe14XXcmd Relationship of minvel, and maxvel SOURcePULMSTATe Usage See Stepper Motor Control onSOURcePULMSTATe? SOURcePULSePERiodSOURcePULSePERiod? SOURcePULSeWIDThSOURceRPULsePOSitionANGLe SOURcePULSeWIDTh?33,554,430 to 33,554,430 SOURRPULseVARType SOURceRPULsePOSitionANGLe?Usage SOURRPULseVARType? SOURceRPULseWIDThANGLeSOURceRPULseWIDThTIME SOURceRPULseWIDThANGLe?00000787 to SOURceRPULseWIDThTIME? Specifications General SpecificationsFrequency Measurement Pulse Width Measure Rotational Pulse Source
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