PC-CARD-DAC08
Analog Output Board
User’s Guide
Document Revision 2, December, 2006
© Copyright 2006, Measurement Computing Corporation
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HM PC-CARD-DAC08.doc
3
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4
Table of Contents
Preface
About this User's Guide .......................................................................................................................7
What you will learn from this user's guide.........................................................................................................7
Conventions in this user's guide.........................................................................................................................7
Where to find more information.........................................................................................................................7
Chapter 1
Introducing the PC-CARD-DAC08.......................................................................................................8
Overview: PC-CARD-DAC08 features..............................................................................................................8
PC-CARD-DAC08 block diagram.................................................................................................................................... 8
Software features................................................................................................................................................8
Chapter 2
Installing the PC-CARD-DAC08...........................................................................................................9
What comes with your PC-CARD-DAC08 shipment? ......................................................................................9
Hardware .......................................................................................................................................................................... 9
Additional documentation................................................................................................................................................. 9
Optional components........................................................................................................................................................ 9
Unpacking the PC-CARD-DAC08...................................................................................................................10
Installing the software ......................................................................................................................................10
Installing the PC-CARD-DAC08.....................................................................................................................10
If the PC-CARD-DAC08 is not detected by Windows....................................................................................................10
Connecting the board for I/O operations..........................................................................................................11
Connectors, cables – main I/O connector ........................................................................................................................11
Pin out – main I/O connector...........................................................................................................................................11
Field wiring and signal termination.................................................................................................................................13
Chapter 3
Programming and Developing Applications....................................................................................14
Programming languages...................................................................................................................................14
Packaged applications programs ......................................................................................................................14
Register-level programming.............................................................................................................................14
Chapter 4
Functional Details...............................................................................................................................15
Connecting devices to the analog outputs ........................................................................................................15
Output voltage range ........................................................................................................................................15
Signal connection .............................................................................................................................................15
External interrupt input.....................................................................................................................................15
Digital inputs and outputs.................................................................................................................................15
Chapter 5
Specifications......................................................................................................................................16
Analog output...................................................................................................................................................16
Accuracy..........................................................................................................................................................................16
Accuracy components (uncalibrated)...............................................................................................................................16
Digital input / output ........................................................................................................................................17
Power consumption..........................................................................................................................................17
Environmental ..................................................................................................................................................17
5
PC-CARD-DAC08 User's Guide
Mechanical .......................................................................................................................................................17
Connector and pin out ......................................................................................................................................17
6
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide explains how to install, configure, and use the PC-CARD-DAC08 so that you get the most out
of its analog output and digital I/O features. This user's guide also refers you to related documents available on
our web site, and to technical support resources.
Conventions in this user's guide
The following conventions are used in this manual to convey special information:
For more information on …
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
<#:#> Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those assigned
to registers, bit settings, etc.
bold text Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes. For
example:
1. Insert the disk or CD and click the OK button.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase. For
example:
The InstaCal installation procedure is explained in the Quick Start Guide.
Never touch the exposed pins or circuit connections on the board.
Where to find more information
The following electronic documents provide information relevant to the operation of the PC-CARD-DAC08.
MCC's Specifications: PC-CARD-DAC08 (the PDF version of the Specifications chapter in this guide) is
available on our web site at www.mccdaq.com/pdfs/PC-CARD-DAC08.pdf
MCC's Quick Start Guide is available on our web site at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
MCC's Guide to Signal Connections is available on our web site at
www.mccdaq.com/signals/signals.pdf
MCC's Universal Library User's Guide is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf
MCC's Universal Library Function Reference is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-functions.pdf
MCC's Universal Library for LabVIEW
www.mccdaq.com/PDFmanuals/SM-UL-LabVIEW.pdf
.
.
™
User’s Guide is available on our web site at
.
.
.
.
PC-CARD-DAC08 User's Guide (this document) is also available on our web site at
www.mccdaq.com/PDFmanuals/PC-CARD-DAC08.pdf
.
7
Chapter 1
Introducing the PC-CARD-DAC08
Overview: PC-CARD-DAC08 features
The PC-CARD-DAC08 is an eight-channel, analog output control board for IBM PC compatible computers
having PCMCIA-type slots. The heart of the board is an octal, 13-bit digital-to-analog converter, of which only
12 bits are used for each output. Analog voltage signals are generated by the D/A from registers. Control of I/O
operations is done by the Field Programmable Gate Array (FPGA) on the board ( ). Double-buffering of
the output registers permits simultaneous output changes.
The analog output range is bipolar, ±5V.
The PC-CARD-DAC08 also provides eight bi-directional digital I/O lines arranged in two 4-bit ports. The DIO
lines provide the capability of sensing and controlling discrete events (via external signal-conditioning
hardware). You can configure the digital ports as eight inputs, eight outputs, or four inputs and four outputs.
PC-CARD-DAC08 block diagram
Figure 1
PC-CARD-DAC08 functions are illustrated in the block diagram shown here.
OCTAL D/A
converter
13-bit
Host Bus Adaptor
Data Bus
Attribute
Controller
FPGA
I/O Port
Memory
I/O Port
Address Bus
Figure 1. PC-CARD-DAC08 block diagram
Digital
4-bits
Digital
4-bits
D/A out 7:0
EXT INT
DIO 3:0
DIO 7:4
Software features
For information on the features of InstaCal and the other software included with your PC-CARD-DAC08, refer
to the Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at
. www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
Check www.mccdaq.com/download.htm
for the latest software version.
8
Installing the PC-CARD-DAC08
What comes with your PC-CARD-DAC08 shipment?
The following items are shipped with the PC-CARD-DAC08.
Hardware
PC-CARD-DAC08
Chapter 2
Additional documentation
In addition to this hardware user's guide, you should also receive the Quick Start Guide (available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
the software you received with your PC-CARD-DAC08 and information regarding installation of that software.
Please read this booklet completely before installing any software or hardware.
). This booklet supplies a brief description of
Optional components
PC-CARD-C37F/26 cable
Signal termination and conditioning accessories
MCC provides signal conditioning and termination products for use with the PC-CARD-DAC08. Refer to
Field wiring and signal termination
on page 13 for a complete list of compatible accessory products.
9
PC-CARD-DAC08 User's Guide Installing the PC-CARD-DAC08
Unpacking the PC-CARD-DAC08
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the PC-CARD-DAC08 from its packaging, ground yourself using a wrist strap or
by simply touching the computer chassis or other grounded object to eliminate any stored static charge.
If any components are missing or damaged, notify Measurement Computing Corporation immediately by
phone, fax, or e-mail:
Phone: 508-946-5100 and follow the instructions for reaching Tech Support.
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
Installing the software
Refer to the Quick Start Guide for instructions on installing the software on the Measurement Computing Data
Acquisition Software CD. This booklet is available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-
Quick-Start.pdf.
Installing the PC-CARD-DAC08
The PC-CARD-DAC08 board is completely plug-and-play. There are no switches or jumpers to set. To install
your board, follow the steps below.
Install the MCC DAQ software before you install your board
The driver needed to run your board is installed with the MCC DAQ software. Therefore, you need to install
the MCC DAQ software before you install your board. Refer to the Quick Start Guide for instructions on
installing the software.
To install your PC-Card, do the following:
Insert the card into a free PC Card/PCMCIA type II or III slot. You do not have to turn the computer off.
The system is designed for power-on installation. You should hear an insertion beep when you insert the
card.
Windows automatically detects, recognizes, and configures the PC-CARD. To verify that the card is
recognized, go to Control Panel\System\Device Manager and the card should now appear under "DAS
Component."
If the PC-CARD-DAC08 is not detected by Windows
If the PCMCIA drivers are not already loaded on the PC, you are prompted for the disk containing this file. The
MCC DAQ software contains this file. If required, insert the Measurement Computing Data Acquisition
Software CD and click
If the card is not detected by Windows and you are not prompted for a driver after inserting the card, check that
your computer's 32-bit PCMCIA drivers are enabled. If they are not, enable them, restart your computer and
then repeat the installation procedure.
OK. The card should be detected by Windows and you should hear an insertion beep.
10
PC-CARD-DAC08 User's Guide Installing the PC-CARD-DAC08
Connecting the board for I/O operations
Connectors, cables – main I/O connector
The table below lists the board connector, applicable cables, and compatible accessory products.
Board connector, cables, and accessory equipment
Connector type Honda 26-pin mini D-type
Connector compatibility Translates to 37D pin out using PC-CARD-C37F/26
Compatible accessory products CIO-MINI37
SCB-37
Pin out – main I/O connector
Figure 2
shows a PC-CARD-DAC08 case looking into the male mini-connector. The connector is mechanically
keyed to insure that the cable is inserted correctly.
Figure 2. 26-pin I/O mini-connector
26-pin mini-connector pin out
Pin Signal Name Pin Signal Name
1 GND 14 EXTERNAL INTERRUPT IN
2 DIGITAL I/O 0 15 DIGITAL I/O 1
3 DIGITAL I/O 2 16 DIGITAL I/O 3
4 DIGITAL I/O 4 17 DIGITAL I/O 5
5 DIGITAL I/O 6 18 DIGITAL I/O 7
6 PC +5V OUT 19 D/A OUT 0
7 GND 20 D/A OUT 1
8 GND 21 D/A OUT 2
9 GND 22 D/A OUT 3
10 GND 23 D/A OUT 4
11 GND 24 D/A OUT 5
12 GND 25 D/A OUT 6
13 GND 26 D/A OUT 7
Connect the analog devices that you want to control with the high side to the numbered analog output, and the
low side to an adjacent ground (GND).
11
PC-CARD-DAC08 User's Guide Installing the PC-CARD-DAC08
PC-CARD-C37F/26 cable user connections on the 37D connector (P2)
Pin Signal Name Pin Signal Name
1 GND 20 D/A OUT 1
2 EXTERNAL INTERRUPT IN 21 GND
3 GND 22 D/A OUT 2
4 DIGITAL I/O 0 23 GND
5 DIGITAL I/O 1 24 D/A OUT 3
6 DIGITAL I/O 2 25 GND
7 DIGITAL I/O 3 26 D/A OUT 4
8 DIGITAL I/O 4 27 GND
9 DIGITAL I/O 5 28 D/A OUT 5
10 DIGITAL I/O 6 29 GND
11 DIGITAL I/O 7 30 D/A OUT 6
12 GND 31 GND
13 GND 32 D/A OUT 7
14 PC +5V OUT 33 GND
15 GND 34 N/C
16 GND 35 N/C
17 GND 36 N/C
18 D/A OUT 0 37 N/C
19 GND
Note: Ground pins 19, 21, 23, 25, 27, 31, and 33 connect to pin 1 inside the 37D housing.
If you remove the 37-pin connector (P2) from the PC-CARD-C37F/26 cable assembly and replace it with a
different user connector, make sure that the wiring of the replacement connector adheres to the twisted-pair
wire pairings listed below.
Wire run list C3726 — P1 (Honda) to P2 (37D)
P1 (Honda) Tw isted-pair wire P2 (37D)
1
20
2
8
3
16
4
5
6
25
7
26
9
10
11
17
12
15
13
22
14
21
23
18
19
24
_ SHIELD 33
BLK
BLU
RED
BLU
BLK
GRN
WHT
BLK
GRN
RED
BLK
ORN
BLK
BRN
BLK
RED
YEL
RED
BLK
YEL
ORN
RED
RED
WHT
RED
BRN
1
20
4
3
6
7
8
10
14
30
12
32
13
15
16
9
29
5
17
24
2
22
26
11
18
28
12
PC-CARD-DAC08 User's Guide Installing the PC-CARD-DAC08
Field wiring and signal termination
You can use the following cabling, screw termination, and signal conditioning products with the PC-CARDDAC08 and PC-CARD-C37F/26 cable.
CIO-MINI37 – 37-pin screw terminal board. Details on this product are available at
www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=102&pf_id=255
SCB-37 – 37-conductor, shielded signal connection box. Details on this product are available on our web
site at www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=196&pf_id=1166
Information on signal connections
General information regarding signal connection and configuration is available in the Guide to Signal
Connections (available at www.mccdaq.com/signals/signals.pdf).
.
.
13
Chapter 3
Programming and Developing Applications
After following the installation instructions in Chapter 2, your board should now be installed and ready for use.
In general there may be no correspondence among registers for different boards. Software written at the
register-level for other models does not function correctly with your board.
Programming languages
Measurement Computing’s Universal Library provides access to board functions from a variety of Windows
programming languages. If you are planning to write programs, or would like to run the example programs for
Visual Basic
site at www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf
Packaged applications programs
Many packaged application programs now have drivers for your board. If the package you own does not have
drivers for the board, please fax or e-mail the package name and the revision number from the install disks. We
will research the package for you and advise how to obtain drivers.
or any other language, please refer to the Universal Library User's Guide (available on our web
).
Some application drivers are included with the Universal Library package, but not with the application package.
If you have purchased an application package directly from the software vendor, you may need to purchase our
Universal Library and drivers. Please contact us by phone, fax or e-mail:
Phone: 508-946-5100 and follow the instructions for reaching Tech Support.
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
Register-level programming
You should use the Universal Library or one of the packaged application programs mentioned above to control
your board. Only experienced programmers should try register-level programming.
If you need to program at the register level in your application, refer to the Register Map for the PC-CARD-
DAC08. This document is available on our website at www.mccdaq.com/registermaps/RegMapPC-CARD-
DAC08.pdf.
14
Chapter 4
Functional Details
Connecting devices to the analog outputs
The analog outputs are single-ended. You must avoid potentials between signal ground and chassis ground on
your computer. If you are using a laptop and are on battery power, the computer is floating with respect to earth
ground, but if the laptop is on the charger unit or on wall power, the laptop may be grounded.
Whenever the computer is grounded, you must connect signals so there is no potential between PC ground and
signal ground. If there is a potential, it is added to the signal.
For example, if your card is supplying 3.5 V and there is a potential of -1.5 V between the PC and the sensor
ground, your device under control is reading 2.0 V instead of 3.5 V.
Output voltage range
The output voltage range is ±5 VDC.
Signal connection
Loads that draw higher currents than the maximum current specified cause the analog output to drop. This
means that a code of 4095 cannot generate a full scale voltage of 5 V.
External interrupt input
Pin 14 (EXTERNAL INTERRUPT IN) on the 26-pin I/O mini-connector is an external input which generates an
interrupt to the computer. You enable the interrupt through software. The interrupt is falling edge triggered
using TTL level signals. The procedure initiated by an interrupt is wholly dependent on programming.
Digital inputs and outputs
The PC-CARD-DAC08 has eight bidirectional digital I/O lines. You can configure the DIO lines as input or
output in groups of eight inputs, eight outputs, or four inputs and four outputs. A register controls the direction
of the digital I/O lines and must be set via software. At power-on or reset, the digital lines are set as inputs.
Digital lines in an input state present a high impedance to any device connected to them. If you are using a
digital line to control the input of a TTL chip, and the digital line changes from an output to an input, the TTL
chip being controlled may detect the turned around line as a "1" or a "0". This could cause the TTL input being
controlled to switch on or off.
To prevent random switching, and to force all digital lines into a known state on power up or reset, install
pull-up or pull-down resistors to fix the state of the line as either high or low. A properly selected resistor does
not interfere with TTL-level output signals.
15
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog output
Table 1. Analog output specifications
D/A converter type MAX547 13-bit Octal MDAC
Resolution 12 bits. LSB of converter not used.
Number of channels Eight voltage output, Single-ended
Output Range ±5V. 1 LSB = 2.44 mV
D/A pacing Software Paced
Throughput System-dependent. Using the Universal Library programmed output
function (cbAOut()) in a loop, in Visual Basic, a typical update rate of
50 KHz (±3 KHz) can be expected. This rate was measured on a 500 MHz
Pentium III based PC running under Windows 98.
Data transfer Programmed I/O
D/A trigger modes Software
Slew rate ± 1.6 V/µS min
Settling time (to ½ LSB of FSR) 8.0 µS typical
Current drive ±1 mA min
Output short-circuit duration Indefinite @ 15 mA
Output coupling DC
Output impedance 0.1 Ω max
Miscellaneous
Double buffered output latches
Update in DAC pairs (for example DAC 0/1, 2/3...) or all DACs
simultaneously
Coding: Offset Binary (0 code = -FS, 4095 code = +FS)
Power up and reset, all DAC's cleared to 0 V, ± 10.2 mV typical
'CLEAR' command to reset all DAC's to 0 V, ± 10.2mV typical in
software
Chapter 5
Accuracy
Table 2. Analog output accuracy specifications
Absolute Accuracy (SW calibrated) ±4.0 LSB
Typical Accuracy (SW calibrated) ±1.8 LSB
Accuracy components (uncalibrated)
Table 3. Accuracy component specifications
Gain Error Offset Error DLE ILE
±40 max, ±20.0 typical ±12.0 max, ±3.0 typical ±0.5 max, ±0.3 typical ±2 max, 0.5 typical
Total board error is a combination of gain, offset, integral linearity and differential linearity error. The
theoretical worst-case error of the board may be calculated by summing these component errors. Worst case
error is realized only in the unlikely event that each of the component errors are at their maximum level, and
causing error in the same direction. Each PC-CARD-DAC08 is tested at the factory to assure the board’s
overall software-calibrated error does not exceed ±4.0 LSB.
16
PC-CARD-DAC08 User's Guide Specifications
Typical accuracy is derived directly from the various component typical errors. This typical error calculation
for a SW calibrated PC-CARD-DAC08 yields ±1.8 LSB. However, this again assumes that each of the errors
contributes in the same direction and the ±1.8 LSB specification is quite conservative.
Digital input / output
Table 4. DIO specifications
Digital type FPGA
Configuration Two ports, four bits each. Programmable as eight input, eight output, or four input
and four output
Input low voltage 0.8 V max
Input high voltage 2.0 V min
Output low voltage (IOL = 4 mA) 0.23 V max
Output high voltage (IOH = –4 mA) 3.86 V min
Absolute maximum input voltage –0.5 V , +5.5 V
Power-up / reset state Input mode (high impedance)
Interrupt enable Programmable
Interrupt source External (EXTERNAL INTERRUPT), falling edge triggered
Power consumption
Table 5. Power consumption specifications
+5 V quiescent
Normal operation 42 mA typical, 110 mA max
CIS read 57 mA typical, 135 mA max
Environmental
Table 6. Environmental specifications
Operating temperature range
Storage temperature range -40 to 100 °C
Humidity 0 to 95% non-condensing
0 to 70 °C
Mechanical
Table 7. Mechanical specifications
Card dimensions PCMCIA type II: 85.6 mm (L) x 54.0 mm (W) x 5.0 mm (H)
Connector and pin out
Table 8. Connector specifications
Connector type Honda 26-pin mini D-type
Connector compatibility Translates to 37D pin out using PC-CARD-C37F/26
Compatible accessory
products
CIO-MINI37
SCB-37
17
PC-CARD-DAC08 User's Guide Specifications
Table 9. Connector pin out
Pin Signal Name Pin Signal Name
1 GND 14 EXTERNAL INTERRUPT IN
2 DIGITAL I/O 0 15 DIGITAL I/O 1
3 DIGITAL I/O 2 16 DIGITAL I/O 3
4 DIGITAL I/O 4 17 DIGITAL I/O 5
5 DIGITAL I/O 6 18 DIGITAL I/O 7
6 PC +5V OUT 19 D/A OUT 0
7 GND 20 D/A OUT 1
8 GND 21 D/A OUT 2
9 GND 22 D/A OUT 3
10 GND 23 D/A OUT 4
11 GND 24 D/A OUT 5
12 GND 25 D/A OUT 6
13 GND 26 D/A OUT 7
Table 10. PC-CARD-C37F/26 user connections on 37D
Pin Signal Name Pin Signal Name
1 GND 20 D/A OUT 1
2 EXTERNAL INTERRUPT IN 21 GND
3 GND 22 D/A OUT 2
4 DIGITAL I/O 0 23 GND
5 DIGITAL I/O 1 24 D/A OUT 3
6 DIGITAL I/O 2 25 GND
7 DIGITAL I/O 3 26 D/A OUT 4
8 DIGITAL I/O 4 27 GND
9 DIGITAL I/O 5 28 D/A OUT 5
10 DIGITAL I/O 6 29 GND
11 DIGITAL I/O 7 30 D/A OUT 6
12 GND 31 GND
13 GND 32 D/A OUT 7
14 PC +5V OUT 33 GND
15 GND 34 N/C
16 GND 35 N/C
17 GND 36 N/C
18 D/A OUT 0 37 N/C
19 GND
Note 1: Pins 19, 21, 23, 25, 27, 31, and 33 connect to pin 1 inside the 37D housing.
If you remove the 37-pin connector (P2) from the PC-CARD-C37F/26 cable assembly and replace it with a
different user connector, make sure that the wiring of the replacement connector adheres to the twisted-pair
wire pairings listed in the following table.
Table 11. Wire run list C3726 — P1 (Honda) to P2 (37D)
P1 (Honda) Twisted pair wire P2 (37D) P1 (Honda) Twisted pair wire P2 (37D)
1 BLK 1 11 BLK 16
20 BLU 20 17 RED 9
2 RED 4 12 YEL 29
8 BLU 3 15 RED 5
3 BLK 6 13 BLK 17
16 GRN 7 22 YEL 24
4 WHT 8 14 ORN 2
5 BLK 10 21 RED 22
6 GRN 14 23 RED 26
25 RED 30 18 WHT 11
7 BLK 12 19 RED 18
26 ORN 32 24 BRN 28
9 BLK 13
_ SHIELD 33
10 BRN 15
18
Declaration of Conformity
Manufacturer: Measurement Computing Corporation
Address: 10 Commerce Way
Suite 1008
Norton, MA 02766
USA
Category: Electrical equipment for measurement, control and laboratory use.
Measurement Computing Corporation declares under sole responsibility that the product
PC-CARD-DAC08
to which this declaration relates is in conformity with the relevant prov isions of the following standards or
other documents:
EU EMC Directive 89/336/EEC: Electromagnetic Compatibility, EN 61326 (1997) Amendment 1 (1998)
Emissions: Group 1, Class A
EN 55011 (1990)/CISPR 11: Radiated and Conducted emissions.
Immunity: EN61326, Annex A
IEC 1000-4-2 (1995): Electrostatic Discharge immunity, Criteria C.
IEC 1000-4-3 (1995): Radiated Electromagnetic Field immunity Criteria A.
IEC 1000-4-4 (1995): Electric Fast Transient Burst immunity Criteria C.
IEC 1000-4-5 (1995): Surge immunity Criteria A.
IEC 1000-4-6 (1996): Radio Frequency Common Mode immunity Criteria A.
IEC 1000-4-8 (1994): Magnetic Field immunity Criteria A.
IEC 1000-4-11 (1994): Voltage Dip and Interrupt immunity Criteria A.
Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
August, 2004. Test records are outlined in Chomerics Test Report #EMI3948.04.
We hereby declare that the equipment specified conforms to the above Directives and Standards.
Carl Haapaoja, Director of Quality Assurance
Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, Massachusetts 02766
(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com
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