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VXI VM4016 User manual

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VM4016
ANALOG COMPARATOR
USER’S
M
ANUAL
P/N: 82-0022-000
Released December 13
th
, 2010
VXI Technology, Inc.
2031 Main Street
Irvine, CA 92614-6509
(949) 955-1894
2
www.vxitech.com
VM4016 Preface 3
TABLE OF CONTENTS
INTRODUCTION
Table of Contents ..................................................................................................................................................... 3
Certification .......................................................................................................................................................... 5
Warranty ............................................................................................................................................................... 5
Limitation of Warranty .......................................................................................................................................... 5
Restricted Rights Legend ...................................................................................................................................... 5
Declaration of Conformity ....................................................................................................................................... 6
General Safety Instructions ...................................................................................................................................... 7
Terms and Symbols ............................................................................................................................................... 7
Warnings ............................................................................................................................................................... 7
Support Resources ................................................................................................................................................... 9
SECTION 1................................................................................................................................................................. 11
Introduction ............................................................................................................................................................ 11
Introduction ......................................................................................................................................................... 11
Description .......................................................................................................................................................... 12
VM4016 General Specifications ......................................................................................................................... 14
SECTION 2................................................................................................................................................................. 15
Preparation for Use ................................................................................................................................................ 15
Installation ........................................................................................................................................................... 15
Calculating System Power and Cooling Requirements ....................................................................................... 15
Setting the Chassis Backplane Jumpers ............................................................................................................... 16
Setting the Logical Address ................................................................................................................................ 16
Front Panel Interface Wiring ............................................................................................................................... 16
SECTION 3................................................................................................................................................................. 19
Programming .......................................................................................................................................................... 19
Examples of SCPI Commands ............................................................................................................................ 19
FETCH:CONDITIONED? .............................................................................................................................. 19
FETCH:LATCHED? ....................................................................................................................................... 20
FETCH:RAW? ................................................................................................................................................ 21
INHOUSE:PSEUDO ....................................................................................................................................... 22
INHOUSE:REGINT ........................................................................................................................................ 23
INHOUSE:REG_ENABLE ............................................................................................................................. 24
INHOUSE:CLEAR_LATCH ........................................................................................................................... 25
INPUT:DEBOUNCE ....................................................................................................................................... 26
INPUT:MASK ................................................................................................................................................. 27
INPUT:MASK:INTERRUPT .......................................................................................................................... 28
INPUT:OFFSET .............................................................................................................................................. 29
INPUT:POLARITY ......................................................................................................................................... 30
INPUT:RANGE ............................................................................................................................................... 31
OUTPUT:POLARITY:EXTERNAL:INTERRUPT ........................................................................................ 32
OUTPUT:POLARITY:EXTERNAL:LATCHED ........................................................................................... 33
Application Examples ............................................................................................................................................ 34
Single Channel Operation ................................................................................................................................... 35
Bracketing a Voltage ........................................................................................................................................... 38
Register Access Examples ..................................................................................................................................... 41
Pseudo Register Access ....................................................................................................................................... 43
VXIplug&play Driver Examples ........................................................................................................................... 44
VXI Technology, Inc.
4 VM4016 Preface
S
ECTION 4................................................................................................................................................................. 49
Command Dictionary ............................................................................................................................................. 49
Introduction ......................................................................................................................................................... 49
Alphabetical Command Listing ........................................................................................................................... 49
Command Dictionary .......................................................................................................................................... 53
Common SCPI Commands .................................................................................................................................... 54
*CLS ................................................................................................................................................................... 54
*ESE ................................................................................................................................................................... 55
*ESR? ................................................................................................................................................................. 56
*IDN? .................................................................................................................................................................. 57
OPC ..................................................................................................................................................................... 58
*RST ................................................................................................................................................................... 59
*SRE ................................................................................................................................................................... 60
*STB? ................................................................................................................................................................. 61
*TRG................................................................................................................................................................... 62
*TST?.................................................................................................................................................................. 63
*WAI ................................................................................................................................................................... 64
Instrument Specific SCPI Commands .................................................................................................................... 65
FETCh:CONDitioned? ........................................................................................................................................ 65
FETCh:LATChed? .............................................................................................................................................. 66
FETCh:RAW? ..................................................................................................................................................... 67
INHOUSE:CLEAR_LATCH .............................................................................................................................. 68
INHOUSE:PSEUDO .......................................................................................................................................... 69
INHOUSE:REGINT ........................................................................................................................................... 70
INHOUSE:REG_ENABLE ................................................................................................................................ 71
INPut:DEBounce ................................................................................................................................................ 72
INPut:MASK ...................................................................................................................................................... 73
INPut:MASK:INTerrupt ..................................................................................................................................... 74
INPut:OFFSet...................................................................................................................................................... 75
INPut:POLarity ................................................................................................................................................... 76
INPut:RANGe ..................................................................................................................................................... 77
OUTPut:POLarity:EXTernal:INTerrupt ............................................................................................................. 78
OUTPut:POLarity:EXTernal:LATChed ............................................................................................................. 79
Required SCPI Commands .................................................................................................................................... 80
STATus:OPERation:CONDition? ...................................................................................................................... 80
STATus:OPERation:ENABle ............................................................................................................................. 81
STATus:OPERation[:EVENt]? ........................................................................................................................... 82
STATus:PRESet.................................................................................................................................................. 83
STATus:QUEStionable:CONDition? ................................................................................................................. 84
STATus:QUEStionable:ENABle ........................................................................................................................ 85
STATus:QUEStionable[:EVENt] ....................................................................................................................... 86
SYSTem:ERRor? ................................................................................................................................................ 87
SYSTem:VERSion? ............................................................................................................................................ 88
SECTION 5................................................................................................................................................................. 89
Theory of Operation ............................................................................................................................................... 89
Introduction ......................................................................................................................................................... 89
Input Range Control ............................................................................................................................................ 90
Signal Comparison .............................................................................................................................................. 92
Interrupt Generation ............................................................................................................................................ 93
INDEX ........................................................................................................................................................................ 95
www.vxitech.com
VM4016 Preface 5
CERTIFICATION
VXI Technology, Inc. (VTI) certifies that this product met its published specifications at the time of shipment from
the factory. VTI further certifies that its calibration measurements are traceable to the United States National
Institute of Standards and Technology (formerly National Bureau of Standards), to the extent allowed by that
organization’s calibration facility, and to the calibration facilities of other International Standards Organization
members.
WARRANTY
The product referred to herein is warranted against defects in material and workmanship for a period of three years
from the receipt date of the product at customer’s facility. The sole and exclusive remedy for breach of any warranty
concerning these goods shall be repair or replacement of defective parts, or a refund of the purchase price, to be
determined at the option of VTI.
For warranty service or repair, this product must be returned to a VXI Technology authorized service center. The
product shall be shipped prepaid to VTI and VTI shall prepay all returns of the product to the buyer. However, the
buyer shall pay all shipping charges, duties, and taxes for products returned to VTI from another country.
VTI warrants that its software and firmware designated by VTI for use with a product will execute its programming
when properly installed on that product. VTI does not however warrant that the operation of the product, or software
or firmware will be uninterrupted or error free.
LIMITATION OF WARRANTY
The warranty shall not apply to defects resulting from improper or inadequate maintenance by the buyer, buyer-
supplied products or interfacing, unauthorized modification or misuse, operation outside the environmental
specifications for the product, or improper site preparation or maintenance.
VXI Technology, Inc. shall not be liable for injury to property other than the goods themselves. Other than the
limited warranty stated above, VXI Technology, Inc. makes no other warranties, express or implied, with respect to
the quality of product beyond the description of the goods on the face of the contract. VTI specifically disclaims the
implied warranties of merchantability and fitness for a particular purpose.
RESTRICTED RIGHTS LEGEND
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subdivision (b)(3)(ii) of the
Rights in Technical Data and Computer Software clause in DFARS 252.227-7013.
VXI Technology, Inc.
2031 Main Street
Irvine, CA 92614-6509 U.S.A.
VXI Technology, Inc.
6 VM4016 Preface
D
ECLARATION OF
C
ONFORMITY
Declaration of Conformity According to ISO/IEC Guide 22 and EN 45014
MANUFACTURER’S NAME VXI Technology, Inc.
M
ANUFACTURER’S ADDRESS 2031 Main Street
Irvine, California 92614-6509
P
RODUCT NAME Analog Comparator
M
ODEL NUMBER(S) VM4016
P
RODUCT OPTIONS All
P
RODUCT CONFIGURATIONS All
VXI Technology, Inc. declares that the aforementioned product conforms to the requirements of
the Low Voltage Directive 73/23/EEC and the EMC Directive 89/366/EEC (inclusive 93/68/EEC)
and carries the “CE” mark accordingly. The product has been designed and manufactured
according to the following specifications:
S
AFETY EN61010 (2001)
EMC EN61326 (1997 w/A1:98) Class A
CISPR 22 (1997) Class A
ICES-003 Class A (ANSI C63.4 1992)
AS/NZS 3548 (w/A1 & A2:97) Class A
FCC Part 15 Subpart B Class A
The product was installed into a C-size VXI mainframe chassis and tested in a typical configuration.
I hereby declare that the aforementioned product has been designed to be in compliance with the relevant sections
of the specifications listed above as well as complying with all essential requirements of the Low Voltage Directive.
December 2003
Steve Mauga, QA Manager
www.vxitech.com
VM4016 Preface 7
GENERAL SAFETY INSTRUCTIONS
Review the following safety precautions to avoid bodily injury and/or damage to the product.
These precautions must be observed during all phases of operation or service of this product.
Failure to comply with these precautions, or with specific warnings elsewhere in this manual,
violates safety standards of design, manufacture, and intended use of the product.
Service should only be performed by qualified personnel.
TERMS AND SYMBOLS
These terms may appear in this manual:
WARNING
CAUTION
These symbols may appear on the product:
ATTENTION - Important safety instructions
placed in accordance with EN 50419, Marking of electrical and electronic
equipment in accordance with Article 11(2) of Directive 2002/96/EC (WEEE).
End-of-life product can be returned to VTI by obtaining an RMA number. Fees
for take-back and recycling will apply if not prohibited by national law.
WARNINGS
Follow these precautions to avoid injury or damage to the product:
Use Proper Power Cord
To avoid hazard, only use the power cord specified for this
product.
Use Proper Power Source
To avoid electrical overload, electric shock, or fire hazard,
do not use a power source that applies other than the
specified voltage.
VXI Technology, Inc.
8 VM4016 Preface
WARNINGS (CONT.)
Avoid Electric Shock
To avoid electric shock or fire hazard, do not operate this
product with the covers removed.
Do not connect or
disconnect any cable, probes, test leads, etc. while they are
connected to a voltage source. Remove all power and unplug
unit before performing any service. Service should only be
performed by qualified personnel.
Ground the Product
This product is grounded through the grounding conductor of
the power cord. To avoid electric shock, the grounding
conductor must be connected to earth ground.
Operating Conditions
To avoid injury, electric shock or fire hazard:
-
Do not operate in wet or damp conditions.
-
Do not operate in an explosive atmosphere.
-
Operate or store only in specified temperature range.
-
Provide proper clearance for product ventilation to
prevent overheating.
-
DO NOT operate if you suspect there is any damage to
this product. Product should be inspected or serviced
only by qualified personnel.
Improper Use
The operator of this instrument is advised that if
equipment is used in a manner not specified in this
manual, the protection provided by this equipment be
may be impaired.
www.vxitech.com
VM4016 Preface 9
SUPPORT RESOURCES
Support resources for this product are available on the Internet and at VTI Instruments customer
support centers.
VTI Instruments Corp.
World Headquarters
VTI Instruments Corp.
2031 Main Street
Irvine, CA 92614-6509
Phone: (949) 955-1894
Fax: (949) 955-3041
VTI Instruments
Cleveland Instrument Division
5425 Warner Road
Suite 13
Valley View, OH 44125
Phone: (216) 447-8950
Fax: (216) 447-8951
VTI Instruments
Lake Stevens Instrument Division
3216 Wetmore Avenue, Suite 1
Everett, WA 98201
Phone: (949) 955-1894
Fax: (949) 955-3041
VTI Instruments, Pvt. Ltd.
Bangalore Instrument Division
135, II & III Floors
Infantry Road
Bangalore – 560 001
India
Phone: +91 80 4040 7900
Fax: +91 80 4170 0200
Technical Support
Phone: (949) 955-1894
Fax: (949) 955-3041
E-mail: support@vtiinstruments.com
Visit http://www.vtiinstruments.com
for worldwide support sites and service plan information.
VXI Technology, Inc.
10 VM4016 Preface
www.vxitech.com
VM4016 Introduction 11
SECTION 1
INTRODUCTION
INTRODUCTION
The VM4016 is a high-performance Analog Comparator module which has been designed to
monitor analog signals and cause VXIbus interrupts to occur when programmed input limits have
been exceeded. The instrument uses the message-based word serial interface for programming and
data movement, as well as supporting direct register access for very high-speed data retrieval. The
VM4016 command set conforms to the SCPI standard for consistency and ease of programming.
The VM4016 is a member of the VXI Technology VMIP (VXI Modular Instrumentation
Platform) family and is available as a 16-, 32- or 48-channel, single-wide VXIbus instrument. In
addition to these three standard configurations, the VM4016 may be combined with any of the
other members of the VMIP family to form a customized and highly integrated instrument (see
Figure 1-1). This allows the user to reduce system size and cost by combining the VM4016 with
two other instrument functions in a single-wide C-size VXIbus module. Figure 1-2 shows the
48-channel version of the VM4016. The 32-channel version would not have J200 and its
associated LEDs and nomenclature while the 16-channel version would also eliminate J202.
V
X
I
B
U
S
I
N
T
E
R
N
A
L
V
M
I
P
B
U
S
VMIP
INTERFACE
VMIP
INSTRUMENT
MODULE #1
VMIP
INSTRUMENT
MODULE #2
VMIP
INSTRUMENT
MODULE #3
F
IGURE 1-1: VMIP™ PLATFORM
VXI Technology, Inc.
12 VM4016 Introduction
Regardless of whether the VM4016 is configured with other VM4016 modules or with
other VMIP modules, each group of 16 channels is treated as an independent instrument
in the VXIbus chassis and, as such, each group has its own FAIL and ACCESS light.
The FAIL LED is a Power/Fault indicator. When normal power up conditions exist, the
FAIL LED will illuminate green. When a power on fault condition occurs, the FAIL LED
will illuminate red. The ACC/ERR LED indicates communication status. When a
successful Access occurs, the LED will blink green during data transfer and
command/query operations. In the event of an unrecognized command, or other data
related error, the ACC/ERR LED will illuminate red. If there is no command/query
activity, and no errors, the ACC/ERR LED will be extinguished. The normal state of the
LEDs on a properly functioning idle instrument is for the FAIL LED to be green, and the
ACC/ERR LED to be off.
DESCRIPTION
The VM4016 is a high-performance Analog Comparator module with 16 input channels
per VMIP daughter module. Each input channel consists of a differential amplifier with a
gain of 1 or 0.1 giving an input range of ±10 V or ±100 V. Each input is compared
against a reference voltage derived from an independent 8-bit DAC.
Each input signal is digitally debounced for a programmed time ranging from
approximately 10 µs to 0.5 s. This prevents input signal noise from causing undesired
interrupts. After debounce, the signal may be programmatically inverted to select the
input transition edge of interest (rising or falling edge) and masked to prevent unused
channels from causing interrupts.
All of the masked inputs are OR’d together to produce a single interrupt signal. This
interrupt signal is used to generate a VXIbus interrupt as well as the front panel interrupt
outputs. All active input is recorded as a “1”. Once the VXIbus interrupt is serviced by
the slot 0 controller, the First Latched Register will be cleared.
The state of each channel’s debounced input and the inverted and masked status may be
read directly in the user defined area of the VXIbus registers as can the First Latched
register. This information may also be retrieved using the message-based word serial
interface.
The block diagram of Figure 1-3 shows the overall functionality of the VM4016 Analog
Comparator instrument.
F
IGURE 1-2: FRONT PANEL LAYOUT
bus
FAIL
ACC/
ERR
FAIL
ACC/
ERR
FAIL
ACC/
ERR
J200
J201
J202
www.vxitech.com
VM4016 Introduction 13
DEBOUNCE
10 uS TO 0.5 S
DIFFERENTIAL
AMPLIFIER
X1 OR X0.1
COMPARATOR
8 BIT DAC
CH1+
CH1-
INVERT
REGISTER
MASK
REGISTER
INTERRUPT
AND FIRST
LIMIT LOGIC
FIRST LIMIT
LATCH
REGISTER
TO VXIBUS
COMPARE
REGISTERS
VXIbus
INTERRUPT
TO VXIBUS
FIRST LIMIT
REGISTER
IRQ
L IRQ
INTERRUPT
INVERT
REGISTER
FIRST LIMIT
INVERT
REGISTER
VXI MODULE
PANEL
CHANNEL 1 OF
CHANNEL 16 OF
+5V
+5V
F
IGURE 1-3: VM4016 BLOCK DIAGRAM
VXI Technology, Inc.
14 VM4016 Introduction
VM4016 GENERAL SPECIFICATIONS
G
ENERAL
S
PECIFICATIONS
C
HANNELS
VM4016-1
VM4016-2
VM4016-3
16
32
48
I
NPUT
R
ANGE
±10.0 V, ±100 V
INPUT THRESHOLD RESOLUTION
±10.0 V
±100.0 V
78 mV
780 mV
I
NPUT
T
HRESHOLD
A
CCURACY
±3%
INPUT TYPE
Differential, may be configured for single-ended by grounding the negative input
I
NPUT
I
MPEDANCE
200 kΩ differential
100 kΩ single-ended
I
NPUT
P
OLARITY
Rising or falling edge
D
EBOUNCE
T
IME
9.6 μs to 0.6291456 s, 9.6 μs resolution
IRQ OUTPUT
Open Collector Driver, 200 mA max. sink
Internally pulled up to +5 V with 10 kΩ resistor
L
ATCHED
IRQ
O
UTPUT
Open collector driver, 200 mA max. sink
Internally pulled up to +5 V with 10 kΩ resistor
VXI
I
NTERFACE
Message-based word serial interface
Direct register access in the user defined area of the VXIbus register map
LOGICAL ADDRESSING
Static or dynamic configuration
R
AW
D
ATA
R
EGISTER
Logical address + 20H
MASKED DATA REGISTER
Logical address + 28H
F
IRST
L
ATCHED
R
EGISTER
Logical address + 30H
POWER REQUIREMENTS
VM4016-1
VM4016-2
VM4016-3
+5 V @ 1.43 A, -5.2 V @ 0.17 A, +24 V @ 0.05 A, -24 V @ 0.05 A
+5 V @ 2.12 A, -5.2 V @ 0.29 A, +24 V @ 0.10 A, -24 V @ 0.10 A
+5 V @ 2.81 A, -5.2 V @ 0.41 A, +24 V @ 0.15 A, -24 V @ 0.15 A
C
OOLING
R
EQUIREMENTS
VM4016-1
VM4016-2
VM4016-3
See Power Cooling Table
See Power Cooling Table
See Power Cooling Table
www.vxitech.com
VM4016 Preparation for Use 15
SECTION 2
PREPARATION FOR USE
INSTALLATION
When the VM4016 is unpacked from its shipping carton, the contents should include the following
items:
One VM4016 VXIbus module
One VM4016 Analog Comparator Module User’s Manual (this manual)
All components should be immediately inspected for damage upon receipt of the unit.
Once the VM4016 is assessed to be in good condition, it may be installed into an appropriate
C-size or D-size VXIbus chassis in any slot other than slot 0. The chassis should be checked to
ensure that it is capable of providing adequate power and cooling for the VM4016. Once the
chassis is found be adequate, the VM4016’s logical address and the chassis’ backplane jumpers
should be configured prior to the VM4016’s installation.
CALCULATING SYSTEM POWER AND COOLING REQUIREMENTS
It is imperative that the chassis provide adequate power and cooling for this module. Referring to
the chassis user’s manual, confirm that the power budget for the system (the chassis and all
modules installed therein) is not exceeded and that the cooling system can provide adequate
airflow at the specified backpressure.
It should be noted that if the chassis cannot provide adequate power to the module, the instrument
may not perform to specification or possibly not operate at all. In addition, if adequate cooling is
not provided, the reliability of the instrument will be jeopardized and permanent damage may
occur. Damage found to have occurred due to inadequate cooling would also void the warranty of
the module.
VXI Technology, Inc.
16 VM4016 Preparation for Use
SETTING THE CHASSIS BACKPLANE JUMPERS
Please refer to the chassis User’s Manual for further details on setting the backplane jumpers.
SETTING THE LOGICAL ADDRESS
The logical address of the VM4016 is set by a single 8-position DIP switch located near the
module’s backplane connectors (this is the only switch on the module). The switch is labeled with
positions 1 through 8 and with an ON position. A switch pushed toward the ON legend will signify
a logic 1; switches pushed away from the ON legend will signify a logic 0. The switch located at
position 1 is the least significant bit while the switch located at position 8 is the most significant
bit. See Figure 2-1 for examples of setting the logical address switch.
SET TO 4
1
ON
2 3 4 5 6 7 8
SET TO 168
1 2 3 4 5 6 7 8
SET TO 8
1
ON
2 3 4 5 6 7 8
SET TO 255
1
ON ON
2 3 4 5 6 7 8
1
2
3
4
5
6
7
8
Switch
Position
1
2
4
8
16
32
64
128
Switch
Value
ON ON
(Dynamic)
F
IGURE 2-1: LOGICAL ADDRESS SWITCH SETTING EXAMPLES
The VMIP may contain three separate instruments and will allocate logical addresses as required
by the VXIbus specification (revisions 1.3 and 1.4). It is necessary that the address of the first
instrument (the instrument closest to the top of the module) be set at an address which is divisible
by 4 and not set to 0. Switch positions 0 and 1 must always be set to the OFF position. Therefore
only addresses of 4, 8, 12, 16 ... 252 are allowed. The address switch should be set for one of these
legal addresses and the address for the second instrument (the instrument in the center position)
will automatically be set to the switch set address plus one; while the third instrument (the
instrument in the lowest position) will automatically be set to the switch set address plus two.
If dynamic address configuration is desired, the address switch should be set for a value of 255.
Upon power-up, the slot 0 resource manager will assign logical addresses to each instrument in the
VMIP module.
FRONT PANEL INTERFACE WIRING
The VM4016’s interface is made available on the front panel of the instrument. The 16-channel
version (VM4016-1) will have J201 that contains all signals for this instrument. The 32-channel
version (VM4016-2) will have J201 and J202 provided, while the 48-channel version (VM4016-3)
will have J200, J201, and J202. The wiring for each of these connectors is identical and since each
group of 16 channels is treated as a separate instrument, the module will have three Channel 1s,
three Channel 2s, three Channel 3s, etc.
www.vxitech.com
VM4016 Preparation for Use 17
The connector used in the VM4016 is a commonly available 44-pin high density D-sub receptacle
connector. A mating solder cup pin connector from AMP is included, crimp type connectors are
available from a variety of sources.
SIGNAL
PIN NUMBER
SIGNAL
PIN #
CHANNEL 1 +
1
GROUND
23
CHANNEL 1 -
2
CHANNEL 11 +
24
GROUND
3
CHANNEL 11 -
25
CHANNEL 4 +
4
CHANNEL 14 +
26
CHANNEL 4 -
5
CHANNEL 14 -
27
CHANNEL 7 +
6
GROUND
28
CHANNEL 7 -
7
CHANNEL 16 +
29
GROUND
8
CHANNEL 16 -
30
CHANNEL 10 +
9
CHANNEL 3 +
31
CHANNEL 10 -
10
CHANNEL 3 -
32
CHANNEL 13 +
11
GROUND
33
CHANNEL 13 -
12
CHANNEL 6 +
34
GROUND
13
CHANNEL 6 -
35
IRQ OUTPUT
14
CHANNEL 9 +
36
GROUND
15
CHANNEL 9 -
37
CHANNEL 2 +
16
GROUND
38
CHANNEL 2 -
17
CHANNEL 12 +
39
GROUND
18
CHANNEL 12 -
40
CHANNEL 5 +
19
CHANNEL 15 +
41
CHANNEL 5 -
20
CHANNEL 15 -
42
CHANNEL 8 +
21
GROUND
43
CHANNEL 8 -
22
LATCHED IRQ OUT
44
TABLE 2-1: ANALOG COMPARATOR PIN OUTS
The mating connector to J200, J201, or J202 is available from the following company:
Assmann Electronic, Inc. P/N A-HDS44LL-TL-B-R Mating Connector
The pin locations for J200, J201, and J202 are shown in Figure 2-2.
1
16
31
15
30
44
F
IGURE 2-2: J200, J201, AND J202 PIN LOCATIONS
VXI Technology, Inc.
18 VM4016 Preparation for Use
www.vxitech.com
VM4016 Programming 19
SECTION 3
PROGRAMMING
EXAMPLES OF SCPI COMMANDS
FETCH:CONDITIONED?
The FETCh:CONDition query returns the 16-bit value that represents the current conditioned
(masked and inverted) state of the inputs. It is important to note that this information is also
available at the VXIbus register level at offset 0x28.
FETCh:CONDitioned? No query parameters.
EXAMPLES
FETCh:CONDitioned? Returns the state of the conditioned 0
(masked and inverted) inputs.
VXI Technology, Inc.
20 VM4016 Programming
FETCH:LATCHED?
The FETCh:LATChed query returns a 16-bit value that reports the active signals in the First
Latched register. The First Latched register records the active signals when the first new input
channel crossed its threshold. It is important to note that the above information is also available at
the VXIbus register level at offset 0x30.
FETch:LATChed? No query parameters
EXAMPLES
FETCh:LATChed? Returns the active signals in the First
1 Latched register. Channel 1.
FETC:LATC? Returns the active signals in the First
3 Latched Register. Channels 1 and 2.
/