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HP 53A, E1351A Status/Control Register, (TRG INT), Busy (BSY), Direct (DIR), Enable (IRQ EN), Trigger Internal, Enable (IRQ EN), Interrupt Request, Interrupt Request

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Status/Control Register

The Status/Control WRITE register is used to reset the module, enable interrupts, choose direct or scan list control of the channels and to internally trigger channel closing. The READ register indicates if interrupts are enabled, if there is an interrupt and if the module is busy.

base + 0416	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0

Write				Undefined					X	X	X	TRIG	DIR	IRQ	X	CRD
												INT		EN		RST

Read				Undefined					1	1	1	BSY*	1	1	IRQ*	IRQ
																EN*

Card Reset (CRD RST) Writing a one (1) to bit 0 resets the multiplexer. Writing a zero turns the reset function off. You must write a zero after a reset or the module will not operate. The Reset conditions are: all Enables are set false, clear scan list, scan mode enabled (direct bit set 0), DELAY is l μsec and all channels opened.

Interrupt Request Writing a one (1) enables the card to generate interrupts, a zero (0) disables Enable (IRQ EN) it. Enabling this bit puts a zero (0) in IRQ EN*.

Direct (DIR) Selects between direct control and scan list control. A zero (0) indicates scan list control and a one (1) indicates direct control. For scan list control the Direct Registers (base + 0C, base + 0E) are invalidated. For direct control the Scan Channel Configuration Register is invalidated.

Trigger Internal Writing a one (1) immediately advances a channel on the scan list, a zero (TRG INT) (0) is the idle state. Bit is automatically set back to zero (0) upon channel

advance.

Interrupt Request Reading a zero (0) indicates enabled, reading a one (1) indicates disabled.

Enable (IRQ EN*)

Interrupt Request (IRQ*) Reading a zero (0) indicates an interrupt, a one (1) indicates no interrupt. This bit remains one (1) if IRQ EN is disabled. Interrupt remains set until Card Reset or interrupt has been acknowledged.

Busy (BSY*) This bit is set zero (0) during channel closing and the delay period. Triggers will not be accepted. BSY* is unasserted at the beginning of the Channel Closed pulse. If a trigger occurs during the Channel Closed pulse, the pulse is terminated and the channel is advanced. Operates only with downloaded scan list (DIR is zero).

Appendix B

HP E1351A/53A Register-Based Programming 87

Contents

Contents Page Page Page Page Page July 20 Page Reader Comment Sheet BUSINESS REPLY MAIL HEWLETT-PACKARDCOMPANY Page Getting Started with the HP E1351A/53A Using This Chapter FET Multiplexer Module Description Multimeter Connection Points Analog Bus Connector Page Switchbox and Scanning Voltmeter Configurations Digital Bus and Triggering Programming Language Initial Operation Configuring the HP E1351A/53A FET Multiplexer Modules Warnings and Cautions Multiplexer Card Numbers Setting the Address Switch Selecting the Interrupt Line Number Setting the Card ID Switch Connecting User Inputs Adding Signal Conditioning Components/Current Shunts Connecting Field Wiring Wiring a Terminal Module Connecting Multimeters and Signal Generators Analog Bus and Digital Bus Cables Page Using the HP E1351A/53A FET Multiplexer Modules Selecting Channels Page Multiplexer Commands Connecting Switchbox Channels to Direct Terminals Comments Connecting Switchbox Channels to Tree Terminals for Making Measurements Page Scanning a Range of Switchbox Channels Page Example: Making 2-WireOhms Measurements by Scanning Example: Making 4-WireOhms Measurements by Scanning Downloading a Scan List Scanning a Switchbox without a Downloaded Scan List Scanning a Switchbox with a Downloaded Scan List Scanning Voltmeter Configuration with HP E1326B Measuring Temperature Using Thermocouples (HP E1353A Module only) Comments Understanding the HP E1351A/53A FET Multiplexer Modules Commands for Scanning Switchbox Channels Using Scanning Trigger Sources Page Page Example: Scanning with External Instruments Using "Trig Out" and "Event In" Ports Using Stand-Alone Multimeter and Digital Bus Triggering Using Scanning Voltmeter Configuration and Digital Bus Triggering Using the Scan Complete Bit HP E1351A/53A 16-ChannelFET Multiplexer Command Reference Command Types Common Command Format SCPI Command Format Command Separator Abbreviated Commands Implied Commands Note SCPI Command Reference ABORt ARM DISPlay :MONitor:CARD :MONitor[:STATe] Monitoring Switchbox Channels: Selecting the Module to be Monitored: Monitor Mode on an HP 1301 Mainframe Display: Example Enabling the Monitor Mode INITiate Example Enabling Continuous Scans :CONTinuous Example Query Continuous Scanning State Starting the Scanning Cycle: ∙Stopping Scanning Cycles: See the ABORt command OUTPut [ROUTe:] Example Closing Multiplexer Channels CLOSe ∙ Query is Software Readback: The [ROUTe:]CLOSe? command Example Query Multiplexer Channel Closure OPEN Opening Multiplexer Channels OPEN ∙ Query is Software Readback: The [ROUTe:]OPEN? command Query Multiplexer Channel Open State SCAN ∙Scanning Operation: With a valid channel list Stopping Scan: Example Scanning Using External Instruments SCAN:MODE Order of Command Execution: Mode Description: Selecting the 4-Wire SCAN:MODE Example Query Scan Mode SCAN:PORT port Example Selecting the ABUS Port SCAN:PORT Example Query Scan Port SETTling[:TIME] Digital Bus Handshaking: Example Setting 16 μsec SETTling TIME SETTling[:TIME] Example Set and Query the SETTling TIME STATus :OPERation:ENABle SYSTem :CDEScription :CTYPe :ERRor TRIGger :SOURce ∙ Enabling the Trigger Source: The TRIGger:SOURce command Using the Using Digital Bus Trigger: Using External Trigger Inputs: Example Scanning Using External Triggers Scanning Using Bus Triggers :SOURce Example Query Trigger Source IEEE 488.2 Common Commands Command Quick Reference Page HP E1351A/53A FET Multiplexer Specifications Page HP E1351A/53A Register-Based Programming About This Appendix Register Addressing Page The Base Address A16 Address Space Outside the Command Module or Mainframe Register Descriptions Page Register Bit Descriptions Manufacturer ID Register Status/Control Register Scan Control Register Scan Channel Delay Register Scan Channel Configuration Register Configuration Bit (C1 - C0) Executing Commands OUTPut [ROUTe:] SYSTem TRIGger Register-BasedProgramming for Maximum Speed VLD A_D B_D decimal code: Page Multimeter Command and Parameter Opcodes Page Register-Based Programming Error Codes HP E1351A/53A FET Multiplexer Error Messages Page Index