VXI Technology VM1548C User manual

bus
VM1548C
TTL I/O MODULE
USER’S MANUAL
P/N: 82-0045-000
Released July 31, 2007
VXI Technology, Inc.
2031 Main Street
Irvine, CA 92614-6509
[phone]

2

www.vxitech.com
VM1548C Preface 3
TABLE OF CONTENTS
INTRODUCTION
Certification..........................................................................................................................................................6
Warranty ...............................................................................................................................................................6
Limitation of Warranty.........................................................................................................................................6
Restricted Rights Legend......................................................................................................................................6
Declaration of Conformity....................................................................................................................................7
Terms and Symbols ..............................................................................................................................................8
Warnings ..............................................................................................................................................................8
SECTION 1..................................................................................................................................................................11
INTRODUCTION .......................................................................................................................................................11
Introduction ........................................................................................................................................................11
Features...............................................................................................................................................................12
Description .........................................................................................................................................................13
Programming and Data Access...........................................................................................................................13
VM1548 Specifications ......................................................................................................................................15
SECTION 2..................................................................................................................................................................17
PREPARATION FOR USE...........................................................................................................................................17
Installation ..........................................................................................................................................................17
Calculating System Power and Cooling Requirements ......................................................................................17
Setting the Chassis Backplane Jumpers..............................................................................................................17
Setting the Logical Address................................................................................................................................18
Front Panel Interface Wiring ..............................................................................................................................19
SECTION 3..................................................................................................................................................................20
PROGRAMMING.......................................................................................................................................................20
Introduction ........................................................................................................................................................20
Notation ..............................................................................................................................................................22
EXAMPLES OF SCPI COMMANDS ............................................................................................................................23
TTLTRIG Circuit ...............................................................................................................................................23
Interrupt Circuit ..................................................................................................................................................24
Output Register Circuit.......................................................................................................................................25
Input Register Circuit .........................................................................................................................................26
Bi-directional Clock Circuit ...............................................................................................................................27
APPLICATION EXAMPLES ........................................................................................................................................28
Write Mode.........................................................................................................................................................28
Read Mode..........................................................................................................................................................30
Write/Read Mode ...............................................................................................................................................33
REGISTER ACCESS EXAMPLES ................................................................................................................................37
VXIPLUG&PLAY EXAMPLES ...................................................................................................................................39
SECTION 4..................................................................................................................................................................45
COMMAND DICTIONARY.........................................................................................................................................45
Introduction ........................................................................................................................................................45
Alphabetical Command Listing..........................................................................................................................45
Terminology .......................................................................................................................................................46
Command Dictionary..........................................................................................................................................50
IEEE 488.2 COMMON COMMANDS .........................................................................................................................51
*CLS...................................................................................................................................................................51
*ESE...................................................................................................................................................................52
*ESR?.................................................................................................................................................................53
*IDN? .................................................................................................................................................................54

VXI Technology, Inc.
4 VM1548C Preface
*OPC ..................................................................................................................................................................55
*RST...................................................................................................................................................................56
*STB?.................................................................................................................................................................57
*TRG ..................................................................................................................................................................58
*TST...................................................................................................................................................................59
*WAI ..................................................................................................................................................................60
INSTRUMENT SPECIFIC SCPI COMMANDS...............................................................................................................61
FORMat..............................................................................................................................................................61
INPut:REGister:POLarity...................................................................................................................................62
INPut:REGister:SOURce ...................................................................................................................................63
INPut:TTLTrig ...................................................................................................................................................64
INPut:TTLTrig:STATE......................................................................................................................................65
OUTPut:CLOCk:ENABle ..................................................................................................................................66
OUTPut:CLOCk:POLarity.................................................................................................................................67
OUTPut:CLOCk:SOURce..................................................................................................................................68
OUTPut:REGister:POLarity...............................................................................................................................69
OUTPut:REGister:SOURce ...............................................................................................................................70
OUTPut:TTLTrig ...............................................................................................................................................71
OUTPut:TTLTrig:POLarity ...............................................................................................................................72
OUTPut:TTLTrig:SOURce ................................................................................................................................73
OUTPut:TTLTrig:STATE..................................................................................................................................74
READ? ...............................................................................................................................................................75
READ? CLOCks ................................................................................................................................................76
READ? CONTrol ...............................................................................................................................................77
READ? ISENse ..................................................................................................................................................78
RESet:ISENse.....................................................................................................................................................79
SOURce:DATA..................................................................................................................................................80
SOURce:DATA:ENABle...................................................................................................................................81
SOURce:DATA:POLarity..................................................................................................................................82
STATus:INTerrupt:ENABle ..............................................................................................................................83
STATus:INTerrupt:NTRansition........................................................................................................................84
STATus:INTerrupt:PTRansition ........................................................................................................................85
TRIGger:SEQuence:IMMediate.........................................................................................................................86
SCPI REQUIRED COMMANDS..................................................................................................................................87
STATus:OPERation? .........................................................................................................................................87
STATus:OPERation:CONDition?......................................................................................................................88
STATus:OPERation:ENABle.............................................................................................................................89
STATus:PRESet .................................................................................................................................................90
STATus:QUEStionable:CONDition?.................................................................................................................91
STATus:QUEStionable:ENABle .......................................................................................................................92
STATus:QUEStionable:EVENt?........................................................................................................................93
SYSTem:ERRor? ...............................................................................................................................................94
SYSTem:VERSion? ...........................................................................................................................................95
SECTION 5..................................................................................................................................................................97
THEORY OF OPERATION..........................................................................................................................................97
Introduction ........................................................................................................................................................97
VXI INTERFACE......................................................................................................................................................98
Device Transfers (Write Mode)..........................................................................................................................98
Direction .............................................................................................................................................................98
Clock Enable ......................................................................................................................................................98
Data Load ...........................................................................................................................................................99
Device Triggering (TTL Input Trigger) ...........................................................................................................100
Trigger Decode.................................................................................................................................................100
Trigger Select ...................................................................................................................................................100
Device Transfers (Read Mode).........................................................................................................................102
Direction ...........................................................................................................................................................102

www.vxitech.com
VM1548C Preface 5
Clock Enable ....................................................................................................................................................102
Latch Data ........................................................................................................................................................103
Read Data .........................................................................................................................................................104
INDEX.......................................................................................................................................................................105

VXI Technology, Inc.
6 VM1548C Preface
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.

www.vxitech.com
VM1548C Preface 7
DECLARATION OF CONFORMITY
Declaration of Conformity According to ISO/IEC Guide 22 and EN 45014
MANUFACTURER’S NAME VXI Technology, Inc.
MANUFACTURER’S ADDRESS 2031 Main Street
Irvine, California 92614-6509
PRODUCT NAME TTL I/O Module
MODEL NUMBER(S) VM1548C
PRODUCT OPTIONS All
PRODUCT 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:
SAFETY EN61010 (2001)
EMC EN61326 (1997 w/A1:98) Class A
CISPR 22 (1997) Class A
VCCI (April 2000) 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
EN 61010-1:2001
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.
July 2007
Steve Mauga, QA Manager

VXI Technology, Inc.
8 VM1548C Preface
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 Indicates that a procedure or condition may cause bodily injury or death.
CAUTION Indicates that a procedure or condition could possibly cause damage to
equipment or loss of data.
These symbols may appear on the product:
ATTENTION - Important safety instructions
Frame or chassis ground
Indicates that the product was manufactured after August 13, 2005. This mark is
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.
Use Proper Fuse To avoid fire hazard, only use the type and rating fuse specified for
this product.

www.vxitech.com
VM1548C Preface 9
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 any damage to this product is suspected.
Product should be inspected or serviced only by qualified
personnel.
Improper Use The operator of this instrument is advised that if the equipment is
used in a manner not specified in this manual, the protection
provided by the equipment may be impaired.
Conformity is checked by inspection.

VXI Technology, Inc.
10 VM1548C Preface
SUPPORT RESOURCES
Support resources for this product are available on the Internet and at VXI Technology customer
support centers.
VXI Technology
World Headquarters
VXI Technology, Inc.
2031 Main Street
Irvine, CA 92614-6509
Phone: [phone]
Fax: [phone]
VXI Technology
Cleveland Instrument Division
5425 Warner Road
Suite 13
Valley View, OH 44125
Phone: [phone]
Fax: [phone]
VXI Technology
Lake Stevens Instrument Division
VXI Technology, Inc.
1924 - 203 Bickford
Snohomish, WA 98290
Phone: [phone]
Fax: [phone]
Technical Support
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Visit http://www.vxitech.com for worldwide support sites and service plan information.

www.vxitech.com
VM1548C Introduction 11
SECTION 1
INTRODUCTION
INTRODUCTION
The VM1548C is a high-performance I/O module that has been designed for high data throughput
and flexibility of configuration. The instrument uses the message-based word serial interface for
programming and data movement as well as allowing direct register access for very high-speed
data input and retrieval. The VM1548C command set conforms to the SCPI standard for
consistency and ease of programming.
The VM1548C is a member of the VXI Technology VMIP™(VXI Modular Instrumentation
Platform) family and is available as a 48-, 96-, or 144-channel, singlewide VXIbus instrument.
Figure 1-1 and Figure 1-2 show the 144-channel version of the VM1548C. The 96-channel
version would not have J200 and its associated LED’s and nomenclature while the 48-channel
version would eliminate J202 as well. In addition to these three standard configurations, the
VM1548C 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 VM1548C with two other instrument functions in a single
wide, C-size VXIbus module.
V
X
I
B
U
S
I
N
T
E
R
N
A
L
V
M
I
P
B
U
S
V
MIP
INTERFACE
V
MIP
INSTRUMENT
MODULE #1
V
MIP
INSTRUMENT
MODULE #2
VMIP
INSTRUMENT
MODULE #3
FIGURE 1-1: VMIP™PLATFORM

VXI Technology, Inc.
12 VM1548C Introduction
bus
FAIL
ACC/
ERR
J200
FAILACC/
ERR
J201
FAILACC/
ERR
J202
Regardless of whether the VM1548C is configured with other VM1548C modules or
with other VMIP modules, each group of 48 channels is treated as an independent
instrument in the VXIbus chassis and as such, each group has its own FAIL/POWER
and ACCESS/ERROR indicators.
FEATURES
•48 channels, 6 groups of 8 bits. Up to 144 channels in a single C-size card.
•Group-wise programmable, as an input or an output, through user TTL input or VXI
A16 registers.
•Group-wise programmable polarity through VXI A16 registers as an active high or
low.
•Input: 0 V to 60 V, VIN(high) ≥2.0 V, VIN(low) ≤1.5 V, input impedance ≥65 kΩ.
•Output: Open collector (N-DMOS), 0 V to 60 V, up to 300 mA continuous with
over-voltage and over-current protection.
•Data throughput: 5 µs typical system speeds, 200 kilobytes (kB) per second using
D8 access, 400 kB per second using D16 access.
•Data Input/Output Clock Sources: For each group, from Front Panel clock input,
VXI TTL Trigger lines, or word serial event (command).
•Capture clock edge programmable as rising edge or falling edge.
•ASCII, Hex, Octal, and Binary data output types.
•Message or Register based data access.
•SCPI compatible.
FIGURE 1-2: FRONT PANEL LAYOUT

www.vxitech.com
VM1548C Introduction
13
DESCRIPTION
The VM1548C Open Collector Digital I/O module is a high performance I/O module that has
been designed for high voltage, current, and data throughput. The instrument uses the message-
based word serial interface for programming and data movement as well as allowing direct
register access for very high-speed.
The VM1548C provide 48 open-collector digital I/O line that are configurable as input or output
in six groups of eight channels each. The module can drive up to 60 V with sink current of up to
300 mA per channel. Each group of 8 bits can be configured as an input or an output under
program control. The VM1548C has the flexibility to source the input and output clocks from
either the front panel (one input per group of 8 bits), the backplane TTL Trigger bus or via a word
serial command. By using the appropriate clocking sources, very large numbers of channels may
by synchronized to collect or present data to a UUT (unit under test).
Each clock input is internally pulled to a logic high level and has a RC termination network to
reduce multiple clocking due to line ringing. The RC network consists of a 120 Ωresistor in series
with a 100 pF capacitor, giving a time constant of 12 ns.
The VM1548C can be combined with any member of the VMIP family to form a customized and
highly integrated instrument.
PROGRAMMING AND DATA ACCESS
The data may be read or loaded by one of two different methods:
Word Serial Message-based Data Access: In this mode, the input or output data and all other
functions are accessed via the VXI message-based
interface. Commands are sent to set the I/O ports
as well as to initiate functions such as triggering an
update or to query a port’s input state. This data
access method is very clean from a programming
perspective, but it is also the slowest of the data
access modes.
Register-Based Data Access: This mode offers the fastest throughput. The I/O
ports are directly mapped into the VXI user
definable registers. Data access occurs in
approximately 500 ns, depending on the controller
and software used.

VXI Technology, Inc.
14 VM1548C Introduction
CLOCK
8:1
SELECT 1:3
SELECT
8:1
SELECT
3:1
MUX
3:1
MUX
3:1
MUX
22
120
47K
100pF
47K
I/O*
DATA I/O
WRITE
DATA
VMIP BUSVXI BACKPLANE
TTL TIGGER 0-7
TTL
TRIGGER
SELECT
READ
DATA
TTL TRIG
OUT SEL
CLKOUTENA
CLK IN
SEL
CLK OUT
SEL
CLKINENA
A
B
A
B
DQDQ
QD
OUTENA
DAMPING
RESISTOR
FRONT
PANEL
A
B
ISENSE
CLKOUTENA
FIGURE 1-3: VM1548C MODULE BLOCK DIAGRAM

www.vxitech.com
VM1548C Introduction
15
VM1548 SPECIFICATIONS
GENERAL SPECIFICATIONS
NUMBER OF CHANNELS
VM1548C-1
VM1548C-2
VM1548C-3
48, 6 groups of 8 bits
96, 12 groups of 8 bits
144, 18 groups of 8 bits
DIRECTION
bi-directional
DATA THROUGHPUT
5 µs typical system (500 µs register cycle time)
200 kB/s using D8 access
400 kB/s using D16 access
PHYSICAL INTERFACE
N channel DMOS transistor (TPIC2601KTC) with a current protection circuit on
the output side, and a voltage divider and voltage comparator on the input side
CHANNEL INPUT CHARACTERISTICS
VIN(high)
VIN(low)
VIN(max)
Input Impedance
≥2.0 V
≤1.5 V
≤60 V
≥65 kΩ
CHANEL OUTPUT CHARACTERISTICS
VOUT(max)
Current Sink (Max.)
Switch On Time
≤60 V
≤300 mA
≤1 µs
CLOCK AND CONTROL INPUT CHARACTERISTICS
VIN(high)
VIN(low)
Current In (VIN = 5.0 V)
> 2.0 V
< 0.8 V
< 10 µA
DATA INPUT CLOCK SOURCES
6 front panel
TTL trigger bus (0 - 7)
word serial command
TTL TRIGGER OUTPUT SOURCES
Front Panel Clock inputs (0 - 5)
CLOCKED INPUT DATA SETUP
≥2 µs
CLOCKED INPUT DATA HOLD
≥0
CLOCKED DATA OUTPUT SKEW
≤2 µs
POWER REQUIREMENTS
+5 V @ 864 mA, +12 V @ 60 mA
COOLING REQUIREMENTS
VM1548C-1
VM1548C-2
VM1548C-3
0.4 L/s
0.8 L/s
1.2 L/s

VXI Technology, Inc.
16 VM1548C Introduction

www.vxitech.com
VM1548C Preparation for Use 17
SECTION 2
PREPARATION FOR USE
INSTALLATION
When the VM1548C is unpacked from its shipping carton, the contents should include the
following items:
(1) VM1548C VXIbus module
(1) VM1548C Open Collector Digital I/O Module User’s Manual (this manual)
All components should be immediately inspected for damage upon receipt of the unit.
Once the VM1548C 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 VM1548C. Once the
chassis is found to be adequate, the VM1548C’s logical address and the chassis’ backplane
jumpers should be configured prior to the VM1548C’s installation.
CALCULATING SYSTEM POWER AND COOLING REQUIREMENTS
The power and cooling requirements of the VM4018 are given in the Specifications section of
Section 1 in this manual. 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
might 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 will void the warranty on the
instrument in question.
SETTING THE CHASSIS BACKPLANE JUMPERS
Please refer to the chassis User’s Manual for further details on setting the backplane jumpers.

VXI Technology, Inc.
18 VM1548C Preparation for Use
SETTING THE LOGICAL ADDRESS
The logical address of the VM1548C 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
2345678
SET TO 168
12345678
SET TO 8
1
ON
2345678
SET TO 255
1
ON ON
2345678
1
2
3
4
5
6
7
8
Switch
Position
1
2
4
8
16
32
64
128
Switch
Value
ON ON
(Dynamic)
FIGURE 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). The logical address of the instrument is set on
the VMIP carrier. The VMIP logical addresses must be set to an even multiple of 4 unless dynamic
addressing is used. Switch positions 1 and 2 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 (All
switches set to ON). Upon power-up, the slot 0 resource manager will assign the first available
logical addresses to each instrument in the VMIP module.
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.

www.vxitech.com
VM1548C Preparation for Use 19
FRONT PANEL INTERFACE WIRING
The VM1548C’s module interface is made available on the front panel of the instrument. The
48-channel version (VM1548C-1) will have J201, which contains all signals for this instrument.
The 96-channel version (VM1548C-2) will have J201 and J202 provided, while the 144-channel
version (VM1548C-3) will have J200, J201 and J202. The wiring for each of these connectors is
identical and since each group of 48 channels is treated as a separate instrument, the module will
have three Channel 1s, three Channel 2s, three Channel 3s, etc.
The connector used in the VM1548C is a readily available 68-pin high-density type commonly
known as a 68-pin version of the SCSI 2 connector. The mating connector is an IDC (Insulation
Displacement Connector) component and is available from a variety of sources. The connector
attaches to two 34-conductor 0.050 centers ribbon cable, and the pin out has been selected to allow
for using the twisted pair type of ribbon cable. Some manufacturers also allow the use of discrete
30 gauge stranded wires.
TABLE 2-1: J200, J201 AND J202 PIN OUTS
PIN SIGNAL PIN SIGNAL PIN SIGNAL PIN SIGNAL
1 GND 18 DATA1.5 35 GND 52 DATA4.5
2 DATA0.0 19 DATA1.6 36 DATA3.0 53 DATA4.6
3 DATA0.1 20 DATA1.7 37 DATA3.1 54 DATA4.7
4 DATA0.2 21 I/O*1 38 DATA3.2 55 I/O*4
5 DATA0.3 22 CLK1 39 DATA3.3 56 CLK4
6 DATA0.4 23 GND 40 DATA3.4 57 GND
7 DATA0.5 24 DATA2.0 41 DATA3.5 58 DATA5.0
8 DATA0.6 25 DATA2.1 42 DATA3.6 59 DATA5.1
9 DATA0.7 26 DATA2.2 43 DATA3.7 60 DATA5.2
10 I/O*0 27 DATA2.3 44 I/O*3 61 DATA5.3
11 CLK0 28 DATA2.4 45 CLK3 62 DATA5.4
12 GND 29 DATA2.5 46 GND 63 DATA5.5
13 DATA1.0 30 DATA2.6 47 DATA4.0 64 DATA5.6
14 DATA1.1 31 DATA2.7 48 DATA4.1 65 DATA5.7
15 DATA1.2 32 I/O*2 49 DATA4.2 66 I/O*5
16 DATA1.3 33 CLK2 50 DATA4.3 67 CLK5
17 DATA1.4 34 GND 51 DATA4.4 68 GND

VXI Technology, Inc.
20 VM1548C Preparation for Use
The mating connector to J200, J201 or J202 is available from the following companies:
AMP Inc.
P/N 749111-6 Connector
P/N 749204-2 Back Shell
P/N 82208 Catalog covering this series of connectors
Circuit Assembly
P/N CA-68NDP-12GT Connector
P/N CA-68NDBS-1M Back Shell
P/N DG01 Catalog covering this series of connectors
The pin locations for J200, J201, and J202 are shown in Figure 2-2.
PIN 1 PIN 35
PIN 34 PIN 68
FIGURE 2-2: J200, J201, AND J202 PIN LOCATIONS
SECTION 3
PROGRAMMING
INTRODUCTION
The VM1548C is a VXIbus message-based device whose command set is compliant with the
Standard Command for Programmable Instruments (SCPI) programming language.