Heisei Electronics DXD Series User manual

I
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© 2016 Ashcroft Inc. 10/16 I&M002-10106 Rev. C
DXD Series
Precision Digital
Pressure Transducer
Operation and
Maintenance Manual
SECTION 1.
Part 1. Installation And Operating Instructions.
Part 2. Command Library And Communication Specification.
SECTION 2.
DXD Setup Utility Manual

II

1
TABLE OF CONTENTS SECTION TOPIC PAGE
Section 1.0 Introduction ........................................................................................................3
Section 2.0 Cautions..............................................................................................................3
Section 3.0 Theory of Operation ...........................................................................................3
Section 4.0 Unpacking...........................................................................................................4
Section 4.1 DXD Transducer(s) ..............................................................................................4
Section 4.2 Certificate of Calibration .....................................................................................4
Section 4.3 Utility Software ...................................................................................................4
Section 4.4 Accessories (RS-232 Configurations only) .........................................................4
Figure 1. Modular Power Supply with RJ11/4 Connector ..................................4
Figure 2. Serial Port Adapter Assembly..............................................................5
Section 4.4.3 25 to 9 Pin Adapter..........................................................................................5
Section 4.4.4 25 Foot Cable ..................................................................................................5
Section 4.4.5 Five-Port Expander Module.............................................................................5
Section 4.4.6 Limitations of the DXD w/USB option .............................................................6
Section 5.0 Installation...........................................................................................................6
Section 5.1 Pressure Connections.........................................................................................6
Section 5.2 System Wiring ....................................................................................................6
Section 5.2.1 RS-232 Cables.................................................................................................6
Section 5.2.2 RS-485 Cables.................................................................................................6
Section 5.2.3 USB Cables .....................................................................................................6
Section 5.2.4 Cable Length and Transmission Speed (RS-232 & RS-485) ...........................7
Section 5.2.5 Pin Functions and Cable Fabrication for RS-232 Compatible Systems..........7
Section 5.3 Installation Wiring for RS-232 Systems with Accessory Kit ...............................7
Section 5.3.1. Pin Functions and Cable Fabrication for RS-232 Compatible Systems.........7
Table 1. Switchcraft™ EN3 Pin Assignments for RS-232 Configuration............8
Table 2. ITT Cannon™ KPT03 Pin Assignments for RS-232 Configuration .......8
Table 3. RJ-11 Connector Functions for RS-232 Systems.................................8
Section 5.4 Wiring Installation for RS-485 Systems ........................................................ 9-11
Section 5.4.1 Pin Functions and Cable Fabrication for RS-485 Compatible Systems........12
Table 4. Switchcraft™ EN3 Pin Assignments for RS-485 Configuration..........10
Table 5. ITT Cannon™ KPT03 Pin Assignments for RS-485 Operation ...........11
Figure 3. USB cable assembly..........................................................................12
Section 5.5 Wiring System for USB applications.................................................................12
Section 6.0 Installing and Running Utility Software.............................................................14
Section 7.0 Using HyperTerminal™ (or other Terminal Emulators) with the DXD ................14
Section 7.1 Configuring HyperTerminal™...................................................................... 14-15
Section 7.2 Basic Communications with the DXD ..............................................................15
Section 7.2.1 Communication and Command Basics.........................................................15
Section 7.3 Launching the Previously Configured HyperTerminal Application....................15
Section 7.4 Talking to the DXD with HyperTermnal™..........................................................15
Section 7.4.1 Determine and Set the Current Address.................................................. 15-16
Section 7.4.2 Determine and Set Baud Rate .......................................................................16
Section 7.4.3 Determine the Pressure Type.........................................................................17
Section 7.4.4 Determine the Full Scale Pressure Range .....................................................17
Section 7.4.5 Get a Pressure Reading.................................................................................17
Section 7.4.6 Get the Heise Label .......................................................................................17
Section 7.4.7 Get and Change the Current User Label .......................................................17
Section 7.4.8 Get and Change the Current User Tare Value................................................17
Section 8.0 Field Calibration................................................................................................18
Section 8.1 Zero Adjustment ...............................................................................................18
Section 8.2 Span Adjustment ..............................................................................................18
Section 9.0 Command Library Command Specification ............................................... 18-19
Section 9.1 Communication Settings ..................................................................................19
Section 9.2 Communication Protocol..................................................................................19
Section 9.2.1 Read Commands...........................................................................................19
Section 9.2.2 Write Commands...........................................................................................19
Section 9.3 Command Library Mnemonics .........................................................................19
Section 10.0 DXD Product Specifications ..................................................................... 20-21

2
COMMAND LIBRARY COMMUNICATION SPECIFICATION
DXD Firmware Change Summary:....................................................................................... 23-24
Communications Introduction...................................................................................................25
Comunications Settings ............................................................................................................25
Communications Protocol.........................................................................................................25
Eeprom Lock ............................................................................................................................26
Command Library Mnemonics .................................................................................................26
AD Unit Address ................................................................................................................26
BR Baud Rate ...................................................................................................................27
ED Eeprom Memory Map Dump........................................................................................27
EF Error Flag.....................................................................................................................28
ER Read From Eeprom Address........................................................................................28
EW Write To Eeprom Address.............................................................................................28
EZ Eeprom Zero (Initialize Eeprom) ...................................................................................29
FA Filter Amount................................................................................................................29
FB Filter Band....................................................................................................................30
FS Full Scale Value ............................................................................................................30
FV Firmware Version..........................................................................................................31
HI Heise Label (Serial Number).........................................................................................31
PS Psi Reading ..................................................................................................................31
PT Pressure Type...............................................................................................................31
RC Raw Counts.................................................................................................................32
ST Sensor Temperature .....................................................................................................32
UL User Label ....................................................................................................................32
US User Span ....................................................................................................................33
UT User Tare ......................................................................................................................33
UZ User Zero .....................................................................................................................34
BA Bar Reading .................................................................................................................34
CW Cm Of Water Reading ..................................................................................................34
FW Feet Sea Water Reading ..............................................................................................35
HP Hectopascal Reading...................................................................................................35
IM Inches Of Mercury Reading..........................................................................................35
IW Inches Of Water Reading .............................................................................................35
KP Kilopascal Reading ......................................................................................................36
MB Millibar Reading ...........................................................................................................36
MM Mm Of Mercury Reading..............................................................................................36
MP Megapascal Reading ...................................................................................................36
NP Numeric Value ..............................................................................................................36
Transducer Command Summary ..............................................................................................37
Read Command Summary........................................................................................................37
AEU Command Summary .........................................................................................................38
Write Command Summary........................................................................................................37
Error Codes (Legacy Mode) ......................................................................................................37
AEU Scale Factors ....................................................................................................................38
Mode Byte.................................................................................................................................38
Detailed Explanation of the “FA” & “FB” Commands................................................................40
Alternate Engineering Units (AEU) Explained ............................................................................42
Update Rate Modifications........................................................................................................42
Synchronous Read Command (Addendum A) .........................................................................44
Read Commands Summary ......................................................................................................45
ATS Varient (Addendum B) ........................................................................................................46
DXD Receiver to Transmit Delay Capabilities (allows half duplex operation in RS-485)..........48
ASCII Character Code Table (page 26 of Installation and Operation Instructions)
DXD Set-up Utility, Manual/Software .................................................................................. 51-71
TABLE OF CONTENTS (cont.)

3
Congratulations on your purchase of a DXD Series Digital Pres-
sure Transducer. This transducer provides unmatched perfor-
mance and value. Innovative modeling and processing firmware
assures extremely high precision over a broad temperature range
as well as extremely fast response. Please read the following
cautions and instructions carefully in order to take full advantage
of the product’s capabilities.
Pressure instruments must be selected in accordance with indus-
try codes and safety practices to avoid the possibility of misuse
or misapplication, which could result in personal injury or property
damage. Personnel responsibility for selection and installation
should also be familiar with the safety recommendations of ANSI/
ASME B40.100-2013, that apply to elastic pressure elements
and their application general and specific services. ANSI/ASME
B40.100-2013 is available from:
ASME
Two Park Avenue
New York NY 10016-5990
Email: [email protected]g
• Select a range so that the maximum applied pressure will never
exceed the upper range limit.
• Excessive vibration could cause loosening of components
resulting in loss of instrument accuracy or failure to provide
valid data.
• Excessive pressure pulsation could result in fatigue failure of the
pressure element.
• Operation of the instrument in an environment where tempera-
tures are in excess of design ratings may result in loss of accu-
racy or failure.
• Pressure boundary materials must be resistant to the process
media. Failure to ensure compatibility may result in pressure
sensing element deterioration or failure. Instruments used on
high pressure gas, or potentially hazardous service, such as
oxygen should be carefully selected in accordance with the
recommendations of ANSI/ASME 40.100-2013.
• Only approved explosion proof or intrinsically safe instruments
should be used in hazardous locations.
• Instruments used in locations where EMI/RFI conditions exist
may exhibit erroneous performance.
• These instruments are not explosion proof or intrinsically safe.
Power levels present preclude use in hazardous locations.
The DXD transducer design employs a piezo resistive strain
gauge, a 24 bit A/D converter, microprocessor, and a 20 MHz
clock. The A/D resolution is internally reduced to 50,000 counts
in order to optimize signal to noise ratio. The raw data is pro-
cessed with a proprietary algorithm which employs a 4th order
polynomial. The math package fits both temperature and pressure
signals from the transducer using coefficients calculated from the
outputs of pressure and temperature standards during the calibra-
tion process. The internal update rate can be can be set to 27.7
mS or 12.6 mS. The DXD responds to a simple ASCII command
protocol. The total transmit/receive time is for fully corrected pres-
sure data is 30 mS (when set to 27.7 mS) and 15 mS (when set to
12.6 mS) at 115200 bps. There may be a slight reduction in signal
stability (1 to 3 counts) when operated at 15 mS, as the difference
in signal processing time is gained at the expense of filtering in
the processor. The firmware supports addressable, multi-drop
operation (except when equipped with the USB option and using
ASHCROFT provided utility software). Electrical communications
are via full duplex RS-232, RS-485 or USB standards. The maxi-
mum resolution is 50,000 counts.
SECTION 1.0 INTRODUCTION
SECTION 2.0 CAUTIONS
SECTION 3.0 THEORY OF OPERATION

4
Please note: When handling connectors care should be used
to avoid electrostatic discharge to prevent damage to the
electronics. The power pins are reverse polarity protected.
Use caution if fabricating connector and cable assemblies
because the digital I/O lines are not protected from the inad-
vertent application of power.
Following is a description of material included in shipment.
The DXD is available in a variety of standard pressure ranges
and types as specified at time of order. It is configured for
either RS-232, RS-485 or USB operation at the factory as
specified at time of purchase. The output is not field configu-
rable. Please check the product label to ensure that the pres-
sure range and output signal type are correct.
Each DXD is provided with a report of calibration traceable to
NIST. The report is packaged with the transducer.
Software is provided on a Flash Drive (Memory Stick). The
Windows™ compatible (WinXP™, Win7™ or Win10™) soft-
ware simplifies the setup and installation of the DXD. It also
provides powerful data logging and pressure display capa-
bilities. Win7™ and WinXP™ compatible LabVIEW™ drivers
along with the LabVIEW™ Runtime Engine are also available.
The following accessory items are available individually or in
kit form at time of order. These accessories are designed for
use with the RS-232 version of the product. The DXD with
complete kit options includes the following items:
The AC Adapter supplies 12 VDC power @500 mA (Fig.1)
connects to the Serial Port Converter and the DXD Trans-
ducer (s) which are interconnected, forming a “network”. The
DXD has its own regulated power supply (internal DC to DC
Converter) and is protected against spikes and power supply
reversal. Each DXD consumes approximately 300 milliwatts,
or 15 ma at 20 volts. The power supply can be plugged in
anywhere along the network, it does not need to be near
the Serial Port Converter. The contact rating of the RJ11/4
(telephone type) connector is 1.5 amps which provides a fast
economical method of interconnection.
Figure 1. Modular Power Supply with RJ11/4 Connector
(831X015-01 Shown)
SECTION 4.0 UNPACKING
SECTION 4.2 CERTIFICATE OF CALIBRATION
SECTION 4.1 DXD TRANSDUCERS
SECTION 4.3 UTILITY SOFTWARE
SECTION 4.4 ACCESSORIES
SECTION 4.41 MODULAR POWER SUPPLY

5
The Serial Port Converter consists of electronics housed in a
standard DB25 enclosure assembly. It has a standard DB25
female RS-232 socket on one end and two RJ11/4 jacks
on the other. The DB25 side plugs into a standard 9 pin to
25 Pin Converter or into a USB-RS-232 Adapter. The Serial
Port Converter ‘s function is to amplify and buffered standard
RS-232C signals so that up to 99 DXD transducers can be
connected in parallel in any configuration, Daisy Chain or
Star. One converter is required per 99 units. The converter
can drive extension cables up to 1000 feet (total cable length)
and still maintain data integrity while communicating at high
speed with each transducer.
Figure 2. Serial Port Converter.
A 25 pin to 9 pin adapter is provided to facilitate connecting
to the Serial Port Converter’s DB25 pin connector to a com-
puter or terminal serial port having a DB9 connector.
The 25 foot cable connects the DXD to an Expander Module
(see below) or directly to a Serial Port Converter. The cable is
provided with a Switchcraft™ or Cannon™ connector on one
end and an RJ11/4 (telephone-type) connector on the other.
Pushing the female connector onto the male socket and then
securing the connector with the sleeve by turning the sleeve
until it locks in place makes connection to the DXD.
A five port expander module consists of a block with five
female RJ11/4 jacks and a six-inch pigtail with a male RJ11/4
connector. The DXD cable plug(s) and the Modular Power
Supply plug are inserted into the available jacks and the male
plug on the pigtail of the five port expander is inserted into
the female jack on the Serial Port Converter.
Figure 3. Five-Port Expander Module
SECTION 4.43 25 T0 9 PIN ADAPTER
SECTION 4.42 SERIAL PORT CONVERTER
SECTION 4.44 25 FOOT CABLE
SECTION 4.45 FIVE-PORT EXPANDER MODULE
H
I

6
Note that for DXD units with the USB interface, only the
provided USB cable is required for operation, as all power
is provided through the cable. Each DXD will require its own
USB port on the PC or a powered HUB (not available through
ASHCROFT Inc.)
Due to the limitations of the existing utility provided by
Ashcroft, only one DXD can be addressed at any one time. If
more than one DXD w/USB needs to be communicated with,
an alternate utility program will be required, which should be
provided by the user.
The installation of the product has three basic steps, which
includes making a pressure connection, system wiring
(connecting communication and power cables to the trans-
ducers and a PC or PLC) and installing and running software
to communicate with and set up the DXD transducer.
The standard pressure inlet fitting is a ¼ inch NPTM type
connector for pressures less than 5000 psi (or equivalent)
and 9/16 – 18 UNF 2B Female port for ranges greater than
5000 psi. Optional fittings are available – consult factory for
specific information.
Important Note: The standard vented housing is recom-
mended for gauge pressure types with ranges less than
500 psi. This is because changes in ambient temperature
will increase or decrease the pressure of the gas volume
within the housing, producing an undesirable effect on the
performance of the unit. The housing is vented through the
Switchcraft™ or Cannon™ electrical connector by removing
one of the unused connector pins at the factory. For USB
option devices the enclosure is vented with a porous mem-
brane (see Table 1 and 2). A sealed housing (no connector
pin removed) can be specified at time of purchase if required.
The effect is approximately ±.027 PSI per degree Fahrenheit
change in ambient temperature.
This is not a factor with absolute pressure ranges because
the reference side of the sensor is evacuated and sealed.
The RS-232 configuration requires four conductors for Signal
In, Signal Out, Power Positive and Power Negative. Prefabri-
cated telephone type cables with RJ11 modular connectors
and Switchcraft™ or ITT Cannon™ connectors can be pur-
chased from the factory as a kit for RS-232 configurations.
Other cable and connector combinations can be fabricated
using user supplied, multiconductor wire and connectors per
the following pin function tables. Minimum 26 AWG wire is
recommended.
The RS-485 configuration requires six conductors, two for
Signal In, two for Signal Out, one for Power Positive, and one
for Power Negative. The user can fabricate similar telephone
type cable and modular connectors for RS-485 configura-
tions. This configuration uses eight conductor RJ45 plugs,
sockets and cables, such as Alpha #9314C 24 AWG. Other
cable and connector combinations can be fabricated using
user supplied, multi-conductor wire and connectors. Mini-
mum 26 AWG wire is recommended.
USB configuration requires cabling with a 2.0 Type A Jack
(host system) at one end and a 2.0 Type mini B Jack (DXD
transducer) at the other. The DXD transducer will obtain
power through the cable from the host system. Ensure that
adequate power is available in cases where multiple DXD
transducers are arranged in a network. If the end user is
SECTION 4.46 LIMITATIONS OF THE DXD W/
USB OPTION
SECTION 5.2 SYSTEM WIRING
SECTION 5.0 INSTALLATION
SECTION 5.1 PRESSURE CONNECTION
SECTION 5.2.1 RS-232 CABLES
SECTION 5.2.2 RS-485 CABLES
SECTION 5.2.3 USB CABLES

7
using a software utility capable of addressing more than one
DXD w/USB at a time (note limitations of the Ashcroft Sup-
plied Utility in section 4.6). Use powered hubs if the host sys-
tem’s power requirements are not adequate for total number
of DXD transducers on the network.
Total cable length, wire gauge and total number of transduc-
ers connected to the system have an effect on maximum
communication speed. This is due to the effects of cumula-
tive resistance and capacitance on the signals. The tables in
appendix B illustrate the relationship between cable length,
number of DXD transducers and communication speed. For
USB configurations, standard USB specifications apply.
The DXD is available with a standard Switchcraft™ EN3 elec-
trical connector or an optional ITT Cannon™ KPT03 (Bendix
PTX compatible) electrical connector, or a Mini B USB female
connector.
Typical RS-232 System Configuration
The following information is provided for reference if you wish
to fabricate your own cables. The Switchcraft™ EN3 connec-
tor has eight pins. The RS-232 configuration utilizes four pins
with the following assignments and functions:
SECTION 5.2.4 CABLE LENGTH & TRANSMIS-
SION SPEED (RS232 & RS-485)
SECTION 5.2.5 TRANSDUCER CONNECTIONS
SECTION 5.3 INSTALLATION WIRING FOR
RS-232 SYSTEMS WITH
ACCESSORY KIT
SECTION 5.3.1 PIN FUNCTIONS & CABLE
FABRICATION FOR RS-232
COMPATIBLE SYSTEMS
Ashcroft
P/N 831X015-03,
POWER SUPPLY
Ashcroft
Pt. # 838X002-01,
25 TO 9 Pin
ADAPTER
Ashcroft
Pt. # 838X003-01,
SERIAL PORT
ADAPTER
Ashcroft
Pt. # 838X001-01,
5 PORT
EXPANDER
HOST PC
RS-232

8
1
2
3
4
5
6
7
8
N/A
SUPPLY (+)
N/A
DIGITAL OUTPUT
N/A
DIGITAL INPUT
SUPPLY COMMON
N/A
*PIN FUNCTION FOR
RS-232 APPLICATION
“SWITCHCRAFT”
CONNECTOR PIN
I.D.
*IMPORTANT
REQUIRES USE OF
SERIAL PORT
CONVERTER (#838X003)
FOR RS-232
FUNCTIONALITY
POSITION #1
POSITION #4
POSITION #7
POSITION #2
POSITION #3 POSITION #5
POSITION #6
POSITION #8
PIN ID INDEX RIB LOCATED
AT BOTTOM OF RECESS.
INDEX RIB IS ALIGNED WITH INDEX GROOVE
ON OPPOSITE END OF CONNECTOR.
NO PIN IN THIS POSITION
FOR VENTED CONNECTOR
A
B
C
D
E
F
G
H
N/A
SUPPLY (+)
N/A
DIGITAL OUTPUT
N/A
DIGITAL INPUT
SUPPLY COMMON
N/A
*PIN FUNCTION FOR
RS-232 APPLICATION
“ITT CANNON”
CONNECTOR PIN
I.D.
*IMPORTANT
REQUIRES USE OF
SERIAL PORT
CONVERTER (#838X003)
FOR RS-232
FUNCTIONALITY
EC
G
H
FB
D
A
Table 1. Switchcraft EN3 Pin Assignment for RS-232
Configuration
Solder Cup View
Table 2. ITT Cannon KPT03 Pin Assignment for RS-232
Configuration

9
Table 3. RJ11 Connector Functions for RS-232 Systems
RS-232 Customer Connector
A typical RS-485 System Interconnection Diagram is shown
on page 12. This configuration uses some components that
are supplied by Ashcroft.
Power Supply. A DC Power Supply capable of providing 12
to 24 VDC and 15 mA per Transducer is required.
–
–
–
–
–
–
–
–
8
7
6
5
4
3
2
1
–
–
–
–
“SWITCHCRAFT”
CONNECTOR PIN
I.D.
“ITT CANNON”
CONNECTOR PIN
I.D.
DIGITAL OUTPUT
DIGITAL INPUT
RJ11 PLUG
HOST DESTINATION
FUNCTIONS FOR
RS-232
APPLICATION
DXD DEFINITION
WIRE COLOR
BLACK
RED
GREEN
YELLOW
SECTION 5.4 WIRING INSTALLATION FOR
RS-485 SYSTEMS
YELLOW WIRE GREEN WIRE
RED WIRE
BLACK WIRE

10
Required Equipment (RS-485)
Either an RS-485 Card, such as B&B Electronics “MIPORT”
Isolated PCI Multi-Output Card (model #3PCIOU1), or an
RS-485 Adapter (B&B Model USPTL-4) capable of running in
full duplex mode is required for setting up an RS-485 system.
Connectors: The DXD is supplied with either Switchcraft or
Cannon connectors as specified at time of purchase. The pin
identification and assignments are shown in Tables 4 and 5.
Table 4. Switchcraft EN3 Pin Assignments for RS-485
Configuration
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 3
PIN 8
PIN 1 INDEX
1
2
3
4
5
6
7
8
+5V (OUT)
SUPPLY (+)
TXD+
TXD–
RXD+
RXD–
SUPPLY COMMON
N/A
*PIN FUNCTION FOR
RS-485 APPLICATION
“SWITCHCRAFT”
CONNECTOR PIN
I.D.
SECTION 5.4 WIRING INSTALLATION FOR
RS-485 SYSTEMS (CONT.)

11
Wiring: According to the RS-485 standard, six conductor,
shielded, twisted pair 24 AWG wire is recommended for inter-
connecting RS-485 systems. However, modular telephone
cable (CAT5 or CAT6 rated) and hardware (RJ45 six conduc-
tor) can be employed depending on the application (distance,
EMI, RFI, speed). Daisy chain interconnection is
recommended with minimum drop lengths. See RS-485
schematic, appendix C.
Table 5. ITT Cannon – (Bendix) Compatible Pin
Assignments for RS-485 Operation
A
B
C
D
E
F
G
H
+5V (OUT)
SUPPLY (+)
TXD+
TXD–
RXD+
RXD–
SUPPLY COMMON
N/A
*PIN FUNCTION FOR
RS-485 APPLICATION
“ITT CANNON”
CONNECTOR PIN
I.D.
EC
G
H
FB
D
A

12
Use either the screw type captive USB cable provided
(Ashcroft part no. 611C254-02) (USB Firewire Model
RR-214320-05-78) shown below, or a standard USB cable
with a Mini B type connector at the device end. It is recom-
mended to use the screw type captive connector provided
with the system.
USB Firewire Model RR-214320-05-78
SECTION 5.5 USB APPLICATIONS
SECTION 5.4.1 PIN FUNCTIONS & CABLE
FABRICATION FOR RS-485
COMPATIBLE SYSTEMS
Various cable components are available from the factory for
assembling an RS-485 network. Shown below are ‘Y’Splitters
for either plastic Switchcraft (838D023-01) or metallic (ITT
Cannon (838D024-01) connectors. (Cannon) type connectors.
838D024-01
Ashcroft
P/N 831X015-03,
POWER SUPPLY
Ashcroft
Pt. # 828X023-01,
DXD RS-485
ADAPTER CABLE
Ashcroft
Pt. # 838X022-01,
MODULAR ADAPTER
B & B
Electronics
Model
USPTL4
Adapter

13
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
WHITE/ORANGE
ORANGE
WHITE/GREEN
BLUE
WHITE/BLUE
GREEN
WHITE/BROWN
BROWN
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
WHITE/ORANGE
ORANGE
WHITE/GREEN
BLUE
WHITE/BLUE
GREEN
WHITE/BROWN
BROWN
BROWN
WHITE/GREEN
BLUE
WHITE/BLUE
ORANGE
WHITE ORANGE
SUPPLY COMMON
SUPPLY +
RXD +
RXD –
TXD +
TXD –
G
B
E
F
C
D
BROWN
WHITE/GREEN
BLUE
WHITE/BLUE
ORANGE
WHITE ORANGE
SUPPLY COMMON
SUPPLY +
RXD +
RXD –
TXD +
TXD –
7
2
5
6
3
4
9 PIN FEMALE
“D”-TYPE
CONNECTOR
“BENDIX”
STYLE
CONNECTOR
(ITT CANNON)
RJ45
JACK
SWITCHCRAFT
CONNECTOR
MODULAR ADAPTER
D89 FEMALE TO RJ45 JACK
RJ45 TO RJ45 CABLE
TWISTED PARS 1-2, 3-6, 4-5, 7-8
RJ45 MODULAR “Y”
CONNECTOR
(“BENDIX” STYLE)
RJ45 TO RJ45 CABLE
T
WISTED PARS 1-2, 3-6, 4-5, 7-8
RJ45 MODULAR “Y”
CONNECTOR
(SWITCHCRAFT)
TXD – (TO RXD –)
RXD + (TO TXD +)
RXD – (TO TXD –)
TXD + (TO RXD +)
GND
3 4 5 6 8
RS-485 SCHEMATIC DIAGRAM
POWER
SUPPLY
–
+
78
SECTION 5.5 USB APPLICATIONS (CONT.)

14
Computer Requirements: Any PC capable of running Win-
dows XP, or Win7 or Win10™ can be used.
Software: A data stick (flash drive) is available for the DXD
transducer that provides an easy means of setting up the user
configurable features of the DXD along with data logging and
display capabilities, also avilable for download on our web site.
DXD w/ USB Users: After connecting the DXD into the USB
connector of your PC it will be necessary to determine which
communications port Windows has assigned to the DXD.
This communications port assignment must be matched to
the communications port used within the DXD utility.
To find the assigned port: Go to your PC’s “Control Panel”
through the “Start” menu of your PC. Select “Device Man-
ager” (it may be under “System” / “Hardware” on some oper-
ating systems). Pull down the “Comm Port” headings and
look for the communications port assignment for the DXD.
To verify which comm port was assigned, if not evident, you
can remove the DXD from the system and see which port
disappears after the device manager automatically updates.
Re-connect the DXD and see which port is re-established.
Match that port to the comm port in the DXD utility.
For use with Windows 7, 10 a 3rd party terminal emulation
program can be used (HyperTerminal™, Tera Term, PuTTY
etc.). Windows XP includes a utility terminal emulation pro-
gram called HyperTerminal™. A terminal emulator can be
used to set up user preferences such as (DXD) address, label
etc. and also to read pressure. The following section will
guide you through the steps required to accomplish this. This
tutorial in DXD command structure utilizes HyperTerminal™
as the reference, but should be adaptable to any other termi-
nal emulator, provided you are familiar with the setup charac-
teristics of those programs. The command syntax illustrated
in the following section will familiarize you with how they are
implemented if you wish to write your own program.
Basic Setup Information
Each DXD transducer is configured for address value = 01
and bit rate = 19,200 bits per second as shipped from the
factory. These values can be changed, however, the following
instructions assume that you are using the DXD in the factory
configuration.
Signal and Power Connections
Make all electrical and power connections as described in
Section 5.0. IMPORTANT: Be sure to connect only one DXD
until you are familiar with addressing conventions.
The HyperTerminal™ application prompts you through the
process of setting up communication parameters that include
assigning a file name and icon and also setting the com port,
data format, bps (bit per second). After this is done, you can
save the configuration using a name like “DXD” and simply
open it by name without the need to re-configure it each
time it is used. This application will work with RS-232 ports,
RS-485 ports or USB to RS-232 (RS-485) adapters.
1. Click the Start Button on the task bar and drag up to Run…
2. Type “hypertrm” in the text box and click OK.
3. You will be prompted for a name, so use something easy
to remember, like DXD. Type the name and select an icon.
Click the OK Button.
4. In the next box you may be prompted for a phone number.
Pull down the Connect Using box and choose the appro-
priate Com Port and click OK. (note – a phone number
isn’t used in this type of setup).
SECTION 6.0 INSTALLING AND RUNNING
UTILITY SOFTWARE
SECTION 7.0 USING A TERMINAL EMULATION
PROGRAM
SECTION 7.1 CONFIGURING HyperTerminal™

15
5. Next you will be prompted for Com Port setup which
should be configured as follows:
Bits Per Second 19200
Data Bits 7
Parity Even
Stop Bits 1
Flow Contro None
6. Next click on the Settings tab and click the ASCII Setup
button.
7. Click in the Check Boxes labeled
mSend line ends with line feeds
mEcho typed characters locally
Click OK to close this box, and OK to close the next box.
8. You have now configured HyperTerminal to communicate
with the DXD. Open the File drop box in the upper left
hand corner of the window and select Save. This will save
the Com Port configuration for later use.
9. Open the File drop box in the upper left hand corner of
the HyperTerminal window and select Exit. You will be
prompted by an alert message stating that you are cur-
rently connected and asking if you want to terminate now.
Click Yes, and HyperTerminal will close.
The command library in Section 9 contains a detailed
description of all of the DXD commands, responses and data
formats. It also outlines the command syntax required to read
from or write to the DXD. The following section describes
how to use these commands via HyperTerminal.
There are some basic conventions and characteristics which
must be observed in order to communicate with the DXD.
• The data format is 7 data bits, 1 stop bit , even parity.
• All commands are prefaced with the pound sign charac-
ter (“#”, ASCII 35) which serves as an attention character.
• All responses are alphanumeric and include a carriage
return (CR) and line feed (ASCII 13 and 10 respectively).
• The pound sign is always followed by a two character
numeric address (01 through 99). Note that with one DXD
connected you can substitute a double asterisks (“*”,
ASCII 42) if you don’t know the current address value.
• The DXD has two categories of commands, which are
Read (get data from) and Write (send data to) the DXD.
All Read commands are issued as upper case characters
and corresponding Write commands are issued using
lower case characters followed by the data to be written.
• The format of data used in write commands is critical, so
please review the command library if you encounter prob-
lems in the following section.
Note: The [CR] in the following example means hit the Enter
key. A carriage return (ASCII 13) is required to terminate a
read or write command.
1. Ensure that only one DXD is connected to the computer
and that power is applied.
2. Click the Start button on the task bar, select All Pro-
grams, then Accessories and then click on Hyper-
Terminal. This will open a folder on the desk top that
contains the HyperTerminal setup that you created in
the preceding section. Double click on the File icon to
launch HyperTerminal. When the program opens, it will
be properly configured to communicate with the DXD set
to factory defaults.
The value retrieved with the AD (Address) command is com-
prised of 7 alphanumeric characters (including CR/LF) that
can be modified by the user to set a desired address value.
SECTION 7.2.1 COMMUNICATIONS &
COMMAND BASICS
SECTION 7.3 LAUNCHING THE PREVIOUSLY
CONFIGURED HyperTerminal
APPLICATION
SECTION 7.4 TALKING TO THE PREVIOUSLY
CONFIGURED DXD WITH
HyperTerminal
SECTION 7.4.1 DETERMINE AND SET THE
CURRENT ADDRESS
SECTION 7.2 BASIC COMMUNICATIONS WITH
THE DXD
SECTION 7.1 CONFIGURING HyperTerminal™
(CONT.)

The address of the DXD is user configurable and the factory
default value is 01.
Note: There may be circumstances where the address of
a DXD is unknown. To simplify the task of determining the
current address setting, the DXD can recognize a “wild card”
value comprised of double asterisks (**). Substitute it in the
address portion of a read command. For example, a #01AD
can be sent as #**AD (provided only one DXD is connected to
the system).
1. To determine the DXD’s current address, type the follow-
ing command: #**AD[CR]
2. The DXD will respond with the following message
AD=01, indicating that the DXD’s address is currently
configured to the value of 01.
3. To change the DXD’s address from 01 to 02, type the
following command: #01ad02[CR]
4. To verify that the address has been changed, send the
following message: #AD02[CR]
5. The DXD will respond with the following message:
AD=02
6. To change the DXD’s address back to 01, type the fol-
lowing command: #01ad[CR]
7. To verify that the address has been changed, type the
following command: #01AD[CR]
8. The DXD will respond with the following message:
AD=01
The value retrieved with the BR (Baud Rate) command is
comprised of 11 alphanumeric characters (including CR/LF)
which can be modified by the user to set the desired system
baud rate.
1. To read the current baud rate, type the following com-
mand in the HyperTerminal window: #01BR[CR]
2. The DXD will respond with the following message:
BR=19200
3. To change the current baud rate, you must first change
the DXD’s settings, then change the com port settings
for HyperTerminal to match. To change the DXD baud
rate from 19200 to 9600, type the following command:
#01br=9600[CR]
4. You will be unable to communicate with the DXD until the
com port settings have been changed in HyperTerminal.
5. To do this, click “File” from the menu bar and select
“Properties” from the pull-down selections. When the
Properties Dialog opens, click on the “Configure” button.
(Note: if the “Configure” button is grayed out then select
“Call” from the menu bar, then click “Disconnect”). From
the Com Properties Dialog Box, click the pull-down next
to “Bits per Second”, then select 9600. Click OK to close
the Com Properties Dialog Box. Finally, click OK to close
the Properties Dialog Box.
6. To read the revised baud rate, type the following com-
mand: #01BR[CR]
7. The DXD will respond with the following message:
BR=9600
8. To change the baud rate back to 19200 type the following
command: #01br=19200[CR]
9. Remember that you will be unable to communicate
with the DXD until the com port settings are changed in
HyperTerminal.
10. To do this click on the “File” menu and select “Properties”
from the pull-down menu selection. Click the “Config-
ure” button on the Properties Dialog, then select 19200
SECTION 7.4.2 DETERMINE AND SET THE
CURRENT BAUD RATE
16
SECTION 7.4.1 DETERMINE AND SET THE
CURRENT ADDRESS (CONT.)

from the “Bits per Second” pull-down. Click OK to close.
Finally click OK to close the Properties Dialog.
11. To read the revised baud rate, type the following com-
mand: #01BR[CR]
12. The DXD will respond with the following message:
BR=19200
1. The value retrieved with the PT (Pressure Type) com-
mand is the pressure type of the unit. It is comprised of 6
alphanumeric characters (including CR/LF) and specifies
the pressure type of the transducer. It is assigned during
manufacturing and cannot be changed. To read the pres-
sure type (gauge, absolute, vacuum, compound) type the
following command: #01PT[CR]
2. The DXD will respond by transmitting the following mes-
sage to the HyperTerminal window: PT=G (G for Gauge, A
for Absolute, V for Vacuum, C for Compound).
1. The value retrieved with the FS (Full Scale) command is
the full scale pressure range of the unit. It is comprised of
13 alphanumeric characters (including CR/LF) and spec-
ifies the pressure range of the transducer. It is assigned
during manufacture and cannot be changed. To read
the current FS value, type the following command in the
HyperTerminal window. #01FS[CR]
2. The DXD will respond by transmitting the following
message to the HyperTerminal window: FS=+30.000
(Note that the decimal position is range dependent. See
Appendix A for details.)
1. To read the current pressure in PSI, type the following
command in the HyperTerminal window: #01PS[CR]
2. The DXD will respond by transmitting the following mes-
sage to the HyperTerminal window: PS=+000.000 (or the
value of the current pressure)
1. The value retrieved with the HL (Heise Label) command is
the serial number assigned to the unit during manufacture
and cannot be changed. To read the value stored in the
HL location, type the following command: #01HL[CR]
2. The DXD will respond by transmitting the following mes-
sage: HL=000XXX (where X represents your DXD actual
serial number)
1. The value retrieved with the UL (User Label) command
is comprised of up to 16 alphanumeric characters which
can be modified by the user to form a descriptive tag or
identification name. To read the current User Name, type
the following command: #01UL[CR]
2. The DXD will respond by transmitting the following mes-
sage: UL=User Label Here (this is factory default value).
3. To change the current user label to “Test Point 01”, type
the following command: #01ulTest Point 01[CR]
1. The value retrieved with the UT (User Tare) command is
comprised of 11 alphanumeric characters which can be
modified by the user to remove, or “tare out” a pressure
preload from the displayed pressure value. To read the
current user tare value, type the following command:
#01UT[CR].
2. The DXD will respond by transmitting the following mes-
sage: UT=+000.000 (Note: This is the factory default
value and the decimal position will depend on the full
scale range of the unit)
3. To change the current user tare to 1 PSI, type the follow-
ing command: #01ut+001.000[CR]
SECTION 7.4.5 GET A PRESSURE READING
SECTION 7.4.6 GET THE HEISE LABEL
SECTION 7.4.7 GET AND CHANGE THE
CURRENT USER LABEL
SECTION 7.4.8 GET AND CHANGE THE
CURRENT USER TARE VALUE
SECTION 7.4.3 DETERMINE THE PRESSURE
TYPE
SECTION 7.4.4 DETERMINE FULL SCALE
PRESSURE RANGE
17

18
Calibration adjustments on the DXD are limited to zero and
span. A high precision primary standard (50 ppm or better)
is required for the span adjustment on gauge, vacuum and
compound pressure types and a precision absolute standard
is required for absolute pressure types.
1. Zero Adjustment. This example will guide you through
the process of adjusting zero for a gauge, compound
or vacuum pressure type unit. Absolute pressure types
require that you connect the DXD to a vacuum source
capable of achieving 0.05 torr for ranges from 15 to 50
PSIA, or .5 torr for ranges from 60 to 500 PSIA.
2. Be sure that the DXD is at zero pressure (vented to
atmosphere for gauge, vacuum or compound pressure
types) or full vacuum for absolute pressure types.
3. Send the following command: #01uz+000.000[CR]. This
will reset the user zero offset to zero.
4. Send the following command: #01PS[CR] and note the
result which will be something like PS=+000.002.
5. Send the opposite sign of the PS value received in
step 4 above (-000.002) with the following command:
#01uz-000.002[CR]
6. Confirm that the zero adjustment is complete by sending
the following command: #01PS[CR] which should result
in a display of PS=+000.000.
1. This procedure requires a primary pressure for source of
suitable accuracy. The following example is based on a
DXD with a full span rating of 30 PSI. The value that will
be adjusted is US (user span).
2. The first step is to connect the transducer to a pressure
standard and apply full span pressure (30 psi in this
example).
3. Next, retrieve the current pressure reading by sending
the following command: #01PS[CR]
4. The result will be something like this PS=+030.002.
5. Next, retrieve the current value of user span (US) by
sending the following command: #01US[CR].
6. Next, calculate the new value for US by dividing the
known pressure generated (with the standard) by the
displayed value, for example, 30/30.002 = 0.99993.
7. Multiply the current US value retrieved in step 5 by
0.99993 to calculate the new US value.
8. To write the new US value to the DXD, send the following
command: #01uz+0.99993[CR]
9. Confirm that the span has been properly adjusted
by applying full span pressure and retrieving the cur-
rent pressure reading with the following command:
#01PS[CR]
10. The result should be PS=+030.000 (±.005% of full span).
If not, repeat steps 3 through 9 as required.
The DXD Digital Pressure Transducer employs a simple ASCII
character based protocol for communications. A DXD Unit
cannot initiate this communication process. A host device,
i.e. computer, terminal or PLC device must be used to initiate
communications by querying the DXD. Multiple DXD’s on
the same communication bus are addressed sequentially, so
each unit must have a unique, two digit address between 01
and 99.
For applications where only one DXD is on the communi-
cations bus, wildcard characters “**” (double asterisks) can
be used to address a single unit. Note: When using wild-
card addressing for communications, care should be taken
SECTION 8.2 SPAN ADJUSTMENT
SECTION 9.0 DXD COMMAND LIBRARY
SECTION 8.0 FIELD CALIBRATION
SECTION 8.1 ZERO ADJUSTMENT