Acromag DT236-0600 User manual

USB Programmable, DIN Rail Mount,
Dual Isolated Transmitter/Signal Splitter w/ Passive DC
Current/Voltage I/O and 2-Wire 4-20mA Outputs
Model DT236-0600, DC Current & Low DC Voltage Inputs
Model DT237-0600, DC ±1V/±10V Medium Voltage Inputs
Model DT238-0600, DC ±15V/±150V High Voltage Battery
Sources Inputs
USER’S MANUAL
ACROMAG INCORPORATED Tel: [phone]
30765 South Wixom Road email: [email protected]
Wixom, MI 48393-2417 U.S.A.
Copyright 2018, Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice. 8501127D

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 2 -
http://www.acromag.com
- 2 -
https://www.acromag.com
Table of Contents
GETTING STARTED
DESCRIPTION.......................................................................................................4
Key Features........................................................................................................................4
Application..........................................................................................................................5
Mechanical Dimensions .......................................................................................................5
DIN Rail Mounting & Removal..............................................................................................6
ELECTRICAL CONNECTIONS............................................................................7
Input Connections................................................................................................................7
Output/Power Connections .................................................................................................9
Earth Ground Connections .................................................................................................12
USB Connections................................................................................................................13
CONFIGURATION SOFTWARE...................................................................... 14
Quick Overview –Android Reconfiguration........................................................................14
Quick Overview –Windows ...............................................................................................15
OPERATION STEP-BY-STEP.......................................................................... 18
Connections.......................................................................................................................18
Configuration.....................................................................................................................19
Calibration (Optional) ........................................................................................................22
Diagnostics ........................................................................................................................24
BLOCK DIAGRAM ............................................................................................. 25
How It Works.....................................................................................................................25
TROUBLESHOOTING....................................................................................... 26
Diagnostics Table...............................................................................................................26
Service & Repair Assistance ...............................................................................................28
ACCESSORIES .................................................................................................... 29
Software Interface Package................................................................................................29
USB Isolator.......................................................................................................................29
USB A-B Cable....................................................................................................................29

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 3 -
http://www.acromag.com
- 3 -
https://www.acromag.com
USB A-mini B Cable............................................................................................................29
ACCESSORIES .................................................................................................... 30
USB OTG Cable ..................................................................................................................30
End Stops...........................................................................................................................30
SPECIFICATIONS .............................................................................................. 31
Model Numbers.................................................................................................................31
Input .................................................................................................................................31
Input…continued ...............................................................................................................34
Output...............................................................................................................................35
Output…continued ............................................................................................................36
USB Interface.....................................................................................................................36
USB Interface…cont. ..........................................................................................................37
Enclosure & Physical..........................................................................................................37
Environmental...................................................................................................................38
Agency Approvals ..............................................................................................................39
Reliability Prediction..........................................................................................................39
Configuration Controls.......................................................................................................39
REVISION HISTORY......................................................................................... 40
All trademarks are the property of their respective owners.
IMPORTANT SAFETY CONSIDERATIONS
You must consider the possible negative effects of power, wiring, component, sensor, or software failure in the design of
any type of control or monitoring system. This is very important where property loss or human life is involved. It is
important that you perform satisfactory overall system design and it is agreed between you and Acromag, that this is your
responsibility.
The information of this manual may change without notice. Acromag makes no warranty of any kind with regard to
this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular
purpose. Further, Acromag assumes no responsibility for any errors that may appear in this manual and makes no
commitment to update, or keep current, the information contained in this manual. No part of this manual may be
copied or reproduced in any form without the prior written consent of Acromag, Inc.
This manual is for Acromag dual channel 2-wire/loop-powered DT23x transmitters that convert DC voltage or current
input signals to isolated passive current output loops. If your application requires dual output 4-wire transmitters (w/
separate isolated DC power) that drives sourcing voltage/current outputs, please refer to similar SP33x series models. For
thermocouple input signals, please refer to our SP233 (2-wire loop-powered) and SP333 (4-wire DC powered) models.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 4 -
http://www.acromag.com
- 4 -
https://www.acromag.com
GETTING STARTED
DESCRIPTION
Symbols on equipment:
Means “Refer to User’s Manual
(this manual) for additional
information”
Model DT23x-0600 Dual Transmitters provide two isolated ANSI/ISA Type II
transmitters with isolated 2-wire current outputs. Units may operate as a dual
channel two-wire transmitter, a single channel 1 transmitter, or as a channel 1
signal splitter. These models interface with DC Current or DC voltage input signals
according to their model, isolate each input, and separately modulate two isolated
2-wire current loops linearly proportional to their respective inputs.
The DT236-0600 is designed for DC Current (0-20mA/4-20mA) and Low Voltage DC
signals (±0.5V/0-500mV). The DT237-0600 is designed for medium voltage DC
signals (±1V, ±5V, ±10V), and the DT238-0600 for large Voltage DC signals (±15V,
±75V, ±150V Battery Sources). Units provide an adjustable input range, input
isolation, variable input filtering, I/O scaling, and programmable output limits. All
units are setup and calibrated using a wired USB connection to a Windows-based PC
running configuration software (Windows 7 and later), or an Android-based tablet
or smartphone running our Agility mobile APP.
Key Features
•Digitally configured and calibrated w/ Windows software via USB, or a wired
USB-OTG connection to Android smartphones or tablets.
•Dual Channels in a thin 17.5mm wide enclosure for high-density mounting.
•Operates as a dual transmitter, a single CH1 transmitter, or a CH1 splitter.
•High measurement accuracy and linearity with 16-bit I/O conversion.
•Adjustable input ranges and output ranges. Transmitter inputs and outputs
can be scaled independently and differently for each channel.
•Variable input filter adjustment (none, low, medium, or high).
•Each transmitter channel supports two input paths according to range model.
DT236 channels have separate input paths for 0-20mA/4-20mA/0-
11.17mA/±1mA, and ±0.5V/0-500mV. DT237 has separate input paths for
ranges up to ±1V and ±10V. DT238 has separate input paths s for high-level
ranges up to ±15V and ±150V Battery Sources.
•Non-polarized 2-wire loop-powered output channels.
•Output channels can transmit Normal or Reverse Acting output signals.
•Extra output connection screw supports optional sourced output wire
termination (see optional Output/Power Connections).
•Up or down-scale lead-break/burnout detection.
•Transmitters have very low loop burden with terminal voltage down to 7V.
•You may program your own output clamp limits or select Namur compliant
range/limits, helpful to discern over-range conditions from fault detection.
•Wide ambient temperature operation from -40°C to +80°C.
•Thoroughly tested and hardened for harsh environments.
•CE Approved.
•FCC Conformity Class B
•cULus Listed - Class I/Division 2 - Haz. Loc., ATEX, & IECEx.
!

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 5 -
http://www.acromag.com
- 5 -
https://www.acromag.com
Application
For additional information on
these devices and related topics,
please visit our web site at
www.acromag.com and download
our whitepaper 8500-904,
Introduction to Two-Wire
Transmitters.
These dual channel transmitters are designed for high-density mounting on T-type
DIN rails. Channel pairs may be mounted side-by-side on 17.5mm centers.
Models support several input ranges on two isolated channels of current or voltage
input and mate with grounded or non-grounded sensors. Each channel drives an
isolated 4-20mA output current loop linearly with input current or voltage.
The transmitter output signals are two-wire, 4-20mA current loops, allowing the
unit to transmit over long distances with high noise immunity. The inherent live-
zero 4mA offset loop current offers built-in output fault detection if an output wire
should break. An extra connection screw at each output channel allows it to be
optionally wired for a “sourced” 4-20mA output configuration (see Optional Output
Wiring diagram).
Mechanical Dimensions
Units may be mounted to 35mm
“T” type DIN rail (35mm, type
EN50022), and side-by-side on
0.69-inch centers.
WARNING: IEC Safety Standards
may require that this device be
mounted within an approved
metal enclosure or sub-system,
particularly for applications with
exposure to voltages greater than
or equal to 75VDC or 50VAC.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 6 -
http://www.acromag.com
- 6 -
https://www.acromag.com
DIN Rail Mounting & Removal
NOTE: It is recommended that this
unit be mounted upright on a DIN
rail allowing free air flow intake
from the bottom vent to flow
through the unit and out the top
vent. This will allow the unit to
run cooler, improving performance
and helping to extend the life of
the electronics.
Refer to the following figure for attaching and removing a unit from the DIN rail. A
spring-loaded DIN clip is located on the input side bottom. The opposite rounded
edge at the bottom of the output side allows you to tilt the unit upward to lift it
from the rail while prying the spring clip back with a screwdriver. To attach the
module to T-type DIN rail, angle the top of the unit towards the rail and place the
top groove of the module over the upper lip of the DIN rail. Firmly push the unit
downward towards the rail until it snaps into place. To remove it from the DIN rail,
first separate the input terminal blocks from the bottom side of the module to
create a clearance to the DIN mounting area. You can use a screwdriver to pry the
pluggable terminals out of their sockets. Next, while holding the module in place
from above, insert a screwdriver into the lower path of the bottom of the module to
the DIN rail clip and use it as a lever to force the DIN rail spring clip down while
pulling the bottom of the module outward until it disengages from the rail. Then
simply lift it from the rail.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 7 -
http://www.acromag.com
- 7 -
https://www.acromag.com
ELECTRICAL CONNECTIONS
WARNING –EXPLOSION HAZARD –Do not disconnect equipment unless power has
been removed or the area is known to be non-hazardous.
WARNING –EXPLOSION HAZARD –Substitution of any components may impair
suitability for Class I, Division 2.
WARNING –EXPLOSION HAZARD –The area must be known to be non-hazardous
before servicing/replacing the unit and before installing.
Wire terminals can accommodate 14–28 AWG (2.08–0.081mm2) solid or stranded
wire with a minimum temperature rating of 90oC. Input wiring may be shielded or
unshielded type. Ideally, output wires should be twisted pair, or shielded twisted
pair. Terminals are pluggable and can be removed from their sockets by prying
outward from the top with a flat-head screwdriver blade. Channels support two
input paths A & B at TB1 (channel 1) and TB3 (channel 2), each for a different
nominal range. Strip back wire insulation 0.25-inch on each lead and insert the wire
ends into the cage clamp connector of the terminal block. Use a screwdriver to
tighten the screw by turning it in a clockwise direction to secure the wire (0.5-0.6
Nm torque). Since common mode voltages can exist on signal wiring, always use
adequate wire insulation. And as a rule, while output wires are normally separated
from input wiring for safety, this is equally important for low noise pickup.
Important –End Stops: For hazardous location installations (Class I, Division 2 or
ATEX/IECEx Zone 2), it should utilize two end stops (see Acromag 1027-222) to help
secure modules to the DIN rail (not shown).
Input Connections
Note: This transmitter may operate
as a single channel 1 transmitter, a
dual transmitter, or a channel 1
signal splitter. You must apply loop
power to output 1 to operate this
transmitter in any mode.
Sensor wires are wired directly to transmitter input terminals TB1 and TB3 at the
bottom of the module (the spring-loaded DIN clip side), as shown in the connection
drawing on next page. Observe proper polarity when making input connections.
•Separate transmitter inputs at TB1 and TB3 are isolated from each other
and from outputs at TB4 and TB6.As a single transmitter, input is to
TB1/channel 1 and output/power are wired to TB4/output 1. As a signal
splitter, input is to TB1/channel 1 and transmitted to both outputs at TB4
and TB6.
•Inputs are polarized ±, observe proper polarity. The left and right outer
terminals of terminal blocks TB1 and TB3 are positive input paths for
different ranges labeled “+”. The middle terminal is the common return
path for both signal paths. See connection figure below per input model.
•DT236 wires ±20mA DC Current to the leftmost terminal of TB1/TB3 and
±0.5VDC to the rightmost terminal of TB1/TB3. The return for these signal
paths is the middle terminal of TB1/TB3.
•DT337 wires ±1V DC maximum to the leftmost terminal of TB1/TB3 and
±10V DC maximum to the rightmost terminal of TB1/TB3. The return for
these signal paths is the middle terminal of TB1/TB3.
•DT338 wires ±15V DC maximum to leftmost terminal of TB1/TB3 and
±150V DC Battery Sources maximum to the rightmost terminal of TB1/TB3.
The return for these signal paths is the middle terminal of TB1/TB3.
!

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 8 -
http://www.acromag.com
- 8 -
https://www.acromag.com

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 9 -
http://www.acromag.com
- 9 -
https://www.acromag.com
Output/Power Connections
NOTE: Because this unit’s
microcontroller is powered from
output 1, you must connect power
to output loop 1 to operate this
unit in any mode (single
transmitter, dual transmitter, and
signal splitter). Output loop 2 only
powers input 2 and is not used in
single channel 1 transmitter mode.
This dual channel transmitter has two isolated ANSI/ISA Type 2 outputs in which the
channel’s power and output signal share the same two leads or current loop, and
each transmitter output has a “floating” connection with respect to earth ground.
Connect a DC power supply and load in series in each of the two-wire output loops
as shown in the drawings that follow.
•Passive output connections are not polarized. The output + and –designations
are for reference only with current normally input to Output+ and returned via
Output- (current sinking). Output loop 1 powers input 1 & the microcontroller.
•Loop supply voltages should be from 7-32V DC with the 7V minimum
transmitter voltage level adjusted upward to drive nominal current to the loop
load (up to 24mA*Rload), plus any transmission line drop.
•Variation in power supply voltage has negligible effect on transmitter
accuracy between the 7V minimum required by the transmitter and 32V
maximum allowed (may drive loads up to 32-7/0.024=1041Ω at 24mA).
•Variation in load resistance has negligible effect on output accuracy if the loop
supply voltage level is set correctly for the load resistance (see above).
•Note the traditional placement of earth ground in a two-wire current loop.
The transmitter output is not earth grounded at the transmitter. Output Earth
ground is normally applied at the loop power supply minus terminal. The two-
wire transmitter output varies off earth ground by the voltage drop in the load
resistance and lead-wire of the loop.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 10 -
http://www.acromag.com
- 10 -
https://www.acromag.com
Output/Power
Connections…continued
The traditional loop-powered 2-wire “sinking” or passive output connection is
shown below. Shielded twisted-pair wiring is often used at the output to connect
the longest distance between the field transmitter and the remote receiver of the
output loop as shown. Each passive output of this transmitter is isolated and
fluctuates relative to earth ground by the voltage drop in its output load and
connection wire.
In most installations, the output loop power supply will be local to either the unit, or
local to the remote receiver of the output loop. Common receiver devices may
include the input channel of a Programmable Logic Controller (PLC), a Distributed
Control System (DCS), or a panel meter. Some receiver devices already provide
excitation for the transmitter loop and these are referred to as “sourcing” or active
inputs. Other receivers that do not provide loop excitation are referred to as
“sinking” or passive inputs, and these will require that a separate power supply
connect within the loop. These types of receivers are depicted in the figures of the
next two pages.
WARNING: For compliance to applicable safety and performance standards,
the use of twisted pair output wiring is recommended. Failure to adhere to
sound wiring and grounding practices as instructed may compromise safety,
performance, and possibly damage the unit.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 11 -
http://www.acromag.com
- 11 -
https://www.acromag.com
Output/Power
Connections…continued
TIP - Ripple & Noise: Place additional capacitance at the load to help reduce the
60Hz/120Hz ripple sometimes present in industrial applications. For large 60Hz
ripple, connect an external 1uF or larger capacitor directly across the load to reduce
excess ripple. Most modern systems will use high-speed acquisition at the load
making them more sensitive to noise pickup--high frequency noise may be
significantly reduced for these applications by placing a 0.1uF or 0.01uF capacitor
directly across the load, as close to the load as possible (this may also raise RF
immunity).
TIP - Inductive Loads: If either two-wire current loop includes a highly inductive
load (such as an I/P current-to-pressure transducer), this may reduce output
stability for that output. In this case, place a 0.1uF capacitor directly across the
inductive load(s) and this will typically help alleviate the problem.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 12 -
http://www.acromag.com
- 12 -
https://www.acromag.com
Output/Power
Connections…continued
This model includes an extra termination screw marked “C” at each output intended
to provide a convenient tie-point for a “sourcing” wiring variation as shown below.
The C terminals do not connect to the internal circuit but is used to simply join
wired connections. Use of this terminal in your wiring scheme allows you to
connect external power local to the transmitter and form a “sourcing” or active
entity from this “sinking” or passive output as shown below.
Earth Ground Connections
IMPORTANT: A USB isolator is
recommended when configuring
or calibrating a unit to avoid the
ground loop that occurs if your
input signal is also earth grounded
(A PC commonly ties earth ground
to its USB port signal and shield
ground, which is held in common
to the input circuit ground of this
transmitter).
The unit housing is plastic and does not require an earth ground connection to
itself. If the module is mounted in a metal housing, an earth ground wire
connection to that metal housing’s ground terminal (green screw) is usually
required using suitable wire per applicable codes. As a rule of good practice,
isolated circuits are normally earth grounded at only one point. Circuits wired to
isolated analog inputs should be earth grounded as reflected in their input
connection diagram. See the Electrical Connections Drawing for Output/Power
connections and note the traditional position of earth ground for a two-wire output
current loop--earth ground is normally applied at the output loop power supply
minus terminal and held in common with the loop load or loop receiver minus
terminal (not the transmitter output terminal). These type II transmitter output
terminals have a “floating”connection relative to earth ground and their potential
varies with the voltage drop in the load and connection wire. Ground connections
noted are recommended for best results and help protect the unit and its isolated
circuitry by giving it a low impedance path to ground for shunting destructive
transient energy away from sensitive module circuitry. Respect the traditional
position of earth ground in a two-wire current loop and avoid inadvertent
connections to earth ground at other points in the same loop, which would drive
ground loops and negatively affect operation.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 13 -
http://www.acromag.com
- 13 -
https://www.acromag.com
USB Connections
This transmitter is set up, configured, and calibrated with USB software that runs on
a USB-connected Windows-based PC (Windows 7 or later), or via our Agility mobile
APP installed on a compatible Android tablet or smartphone connected via a USB-
OTG cable. Refer to the drawing below to connect your PC or laptop to the
transmitter for reconfiguration and calibration using this software (the optional
connection to an Android smartphone/tablet would not usually require the use of
an isolator, because those devices are battery powered and do not make another
connection to earth ground).
WARNING: The intent of mating
USB with this transmitter is so that
it can be conveniently set up and
calibrated in a safe area, then
installed in the field which may be
in a hazardous area. Do not
attempt to connect a PC or laptop
to this unit while installed in a
hazardous area, as USB energy
levels could ignite explosive gases
or particles in the air.
•USB Signal Isolation is Required (See Below) - You may use Acromag model
USB-ISOLATOR to isolate your USB port, or you can optionally use another USB
signal isolator that supports USB Full Speed operation (12Mbps).
•Configuration Requires USB and Loop Power - This transmitter draws power
from both the current loop and from USB during set up.
IMPORTANT: USB signals to this unit are referenced to the potential of its internal
input 1 signal common which connects to the USB ground and shield ground, and
why we recommended you isolate USB to this device, or alternatively connect it to a
battery powered laptop with no earth ground connection. This would avoid a
potential ground loop between your PC and a grounded input 1 sensor. As a two-
wire device, the current output terminal is not earth grounded and its potential
relative to earth ground varies with the loop current through the load resistance
(net IR drop). Without isolation, the load IR drop would drive a potential difference
between the normally grounded current loop and a grounded USB connection at
the PC, causing a ground loop that would inhibit set up & calibration, or may even
damage the transmitter.
!
Note: Output/Power to Transmitter must
be applied before USB connection
(See Output/Power Connections).

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 14 -
http://www.acromag.com
- 14 -
https://www.acromag.com
CONFIGURATION SOFTWARE
Quick Overview –Android Reconfiguration
This transmitter can be optionally setup & calibrated via the
Acromag Agility™ Config Tool. This software APP can be
downloaded free of charge from play.google.com. To connect to
this transmitter, a USB OTG (On-The-Go) cable (5028-565) and USB
A to Mini-B cable (4001-113) are required. This app is compatible
with Android devices using Ice Cream Sandwich (4.0) or later.
The initial Connection screen of the app is shown at left. Once a device is
connected, the main portion of the app will launch. Briefly, the APP screen is
divided into four tabs for this model. A short description of each tab follows.
Initial Connection Screen Set up –DEVICE SELECT (First Connect to Unit Here)
•Select from connected transmitters by tapping the [Select Device] button
to bring up a list of attached devices. Select a device and tap [Connect] to
open the device.
•To view wiring diagrams for this model, tap the [Wiring Diagram] button
and select the desired model. Swipe left or right to view a connection
drawing (note that no connection is required to just view drawings).
•Android devices normally require user permission to access external
hardware. If “No Device Permission” is indicated in the Device List, select
this device and when prompted, grant permission to access the USB
device and tap [OK].
Configuration Tab –(Setup your I/O)
•Once connected, the app will automatically read your transmitter, its
mode, and display its current configuration.
•Changing any option on this page will send the changes to the transmitter
instantly. The device status field at the bottom of the page will report if
the changes were sent successfully.
Calibration Tab –(Calibrate the Input and/or Output if Needed)
•On screen instruction guides the set up to properly calibrate a transmitter
channel input or output. After completing instructions, tap the [Calibrate]
button.
•The device status at the bottom of the page will report if the calibration
was sent successfully.
Diagnostic Center Tab –(Verify Input operation)
•Select the polling indicator by tapping the [Indicator] button.
•Start polling by tapping the [Start Polling] button.
Utility Page –(Reboot or Restore Settings)
•Tap the [Gear] in the Action bar to access the Utility Page.
•You can tap the [Restore/Reset Factory] utility buttons to get out of
trouble if you ever misconfigure or improperly calibrate a transmitter.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 15 -
http://www.acromag.com
- 15 -
https://www.acromag.com
Quick Overview –Windows
Click “Open” to connect to the DT236-0600 and
your screen will look like this:
After connecting to the DT236-0600, you may
click the Configuration tab to display this screen:
For detailed configuration and calibration
procedures, see the Operation Step-By-Step section
of the Technical Reference on page 23 of this
manual.
HELP –You can press F1 for Help on a selected or
highlighted field or control. You can also click the [?]
button in the upper-right hand corner of the screen
and then click again to point to a field or control to
get a Help message pertaining to the item you
pointed to.
In addition to the optional Android
Agility mobile app, this transmitter can
be configured and calibrated via USB
Configuration Software and a USB
connection to a Windows PC or laptop.
The configuration software can be
downloaded free of charge from our web site at
https://www.acromag.com. This software is also included on a
CDROM bundled with the Configuration Kit TTC-SIP (see
Accessories section). For the DT236 model, look for program
DT236Config.exe. This software is compatible with Windows 7 or
later versions of the Windows operating system.
Communication Setup–First Select/Connect to Unit Here
The initial Communication Setup screen for the DT236 model is
shown at left after clicking [Open] to open communication with a
connected module.
•Select from connected transmitters using the Device scroll
field and Open/Close communications with them.
•Display Model, Serial Number, & Manufacturer of the
transmitter, report its connection Status, or Reset it.
Configuration –Reconfigure the Unit Here
The DT236-0600 Configuration screen is shown at left.
•Click [Get I/O Config] to retrieve the I/O configuration of the
connected unit.
•Select the Operating Mode: Dual Transmitter, Single
transmitter, or Signal Splitter.
•View the config message status in the Status field.
•View the unit’s communication status in the Status field.
•Select each CH Input Type/Range. For DT236, you can select
current of ±20mA, 0-20mA, 4-20mA, 0-11.17mA, or ±1mA for
input A, or voltage ranges of ±0.5V and 0-500mV for input B.
•Set the level of digital filtering to High, Medium, Low, or
None (No digital filter). I/O response times vary with filter
and are indicated next to your selection.
•Use I/O Scaling fields to specify the input range endpoints to
map to the output range zero and full-scale endpoints (some
over/under-range is always included).
•Set your own output operating range limits or enable Namur
limits that differentiate fault levels from over/under range
detents.
•Last, after making I/O changes, send your settings to the unit
by clicking the [Send I/O Config] button and following the
on-screen prompts.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 16 -
http://www.acromag.com
- 16 -
https://www.acromag.com
Quick Overview –Windows...
HELP –You can press F1 for Help on a selected or highlighted
field or control. You can also click the [?] button in the upper-
right hand corner of the screen and then click again to point
to a field or control to get a Help message pertaining to the
item you pointed to.
Calibration (Input or Output)
•Calibrate an input or output channel, as needed.
This unit has already been factory calibrated. If you
encounter excessive error, you can choose to click the
Calibration tab to display the Calibration control page
shown in the screen at left. Note that only nominal I/O
ranges are used for calibration, not the scaled down sub-
ranges you may have set.
To calibrate an Input or Output channel of this model,
simply select the channel click the respective “Cal
Instructions” button and follow the on-screen prompts.
Input…
Before attempting input calibration, first set the Input
Range and its filter level from the Configuration page as
required before calibrating the input and be sure to click
the [Send I/O Config] button of the Configuration page.
Click [Input Cal Instructions] to begin input calibration.
Next when you click input [Zero] or [Full Scale], you will
be prompted to apply a specific input level at TB1 (CH1),
or TB3 (CH2), depending on your selected input range.
Once you have applied this signal to the correct input
terminal, click [OK] of the prompt and follow the on-
screen instructions to complete input calibration.
Output…
Click [Output Cal Instructions] to begin output
calibration. You will be prompted to adjust the input as
required to drive the output to precisely 4.000mA (Zero),
or 20.000mA (Full-Scale). Once the output is set to zero
or full-scale, you simply click the corresponding [Zero] or
[Full-Scale] button of the CALIBRATION - Output to set
the output range zero or full-scale endpoint.
Factory Settings
(Use in Case of Trouble or for Sanitation Purposes)
•Restore a transmitter to its original factory
calibration.
•Restore a transmitter to its initial factory
configuration.
You can click the “Restore Factory”buttons if you ever
misconfigure or improperly calibrate a transmitter such
that its operation appears erratic, or for sanitation
purposes when decommissioning a module.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 17 -
http://www.acromag.com
- 17 -
https://www.acromag.com
Quick Overview –Windows...
HELP –You can press F1 for Help on a selected or highlighted
field or control. You can also click the [?] button in the upper-
right hand corner of the screen and then click again to point
to a field or control to get a Help message pertaining to the
item you pointed to.
Diagnostics (Optional, to Verify Unit Operation)
After making Configuration changes, you may use the
Diagnostics - TEST I/O controls to start/stop polling the
input channel(s) to check your input readings (see screen
at left).
•Use this screen to verify communication with the
unit or diagnose problems with your input wiring.
•Click [Start Polling] to periodically read both input
channels and validate their operation. Click [Stop
Polling] to stop polling the input channels. The
simulated red lamp to the left of the button flashes
slowly when the software polls the input channels.
Stop polling before selecting another page or
sending a new reconfiguration.
The communication status of the polling messages is
also indicated and can be helpful to troubleshoot
connection problems.
Communication (Bottom of Screen)
•Displays communication status messages for the
polling process.
The CCOMMUNICATION STATUS message bar at the
bottom of the screen will display status messages
relative to polling.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 18 -
http://www.acromag.com
- 18 -
https://www.acromag.com
TECHNICAL REFERENCE
OPERATION STEP-BY-STEP
Connections
This section will walk you through
the Connection-Configuration-
Calibration process step-by-step.
But before you attempt to
reconfigure or recalibrate this
transmitter, please make the
following electrical connections
Note: For best results, your input signal source and output meter must be accurate
beyond the unit specifications, or better than ±0.1%. A good rule of thumb is to
ensure that your equipment accuracy be four times better than the rated accuracy
you are trying to achieve with this transmitter (i.e. ±0.025% accurate to achieve
±0.1% accuracy).
1. Connect Input: Refer to Input Connections Drawings on page 7-9 for your
model. Note that each channel has two input paths, each supporting a
different nominal range. For DT236 models at TB1/TB3, connect a precision
current source to path A, or a precision voltage source to path B, as applicable
to your selected range (signal return is the middle terminal). Your signal source
must be adjustable to nominal range zero and full-scale values.
2. Connect Output/Power (each Output): Refer to Output/Power Connection of
page 10 and wire an output current loop to the transmitter as illustrated (both
loops if you are using both channels with the unit in splitter or dual transmitter
mode). All modes must connect power to output 1, which drives power to the
unit microcontroller. You will need to measure the output current accurately
at each output to calibrate the unit. You could connect a current meter in
series in each output loop to read the loop current directly (not
recommended). Alternatively, you could simply connect a voltmeter across a
series connected precision load resistor in each loop, and accurately read the
output current as a function of the IR voltage drop produced in the resistor
(recommended). In any case, be sure to power each loop with a voltage that is
minimally greater than the 7V required by the transmitter, plus the IR drop of
the wiring and terminals, plus the IR drop in the load (be sure to use a current
level that considers the over-scale current as follows: Loop Voltage= 7V+
0.024*Rload with negligible line drop). In this model, output channel 1 powers
the unit’s microcontroller and input channel 1 while output channel 2 only
powers input channel 2. Always apply power to at least output loop 1, even
when connected to USB.
3. Connect to PC via isolated USB: Refer to USB Connection Drawing on page 13
and connect the transmitter to the PC using a USB isolator and cables provided
in the Configuration Kit TTC-SIP. Optionally, you could instead connect the unit
to an Android smartphone or tablet running the Agility mobile app uses a USB-
OTG cable.
Now that you have made your input, output/power, and USB connections, and
applied power to your output loop(s), you can execute the DT236Config.exe,
DT237Config.exe, or DT238Config.exe software per your transmitter model to
begin configuration of your unit (compatible with Windows 7 or later versions
of the Windows operating system), or you may start the Agility mobile app
(Android only).
Connect Input
Connect Output/Pwr
Connect PC/USB
Configure
Optional
Calibrate I/O

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 19 -
http://www.acromag.com
- 19 -
https://www.acromag.com
Configuration
Communication Connection (Start Here)
After executing the Acromag Configuration software for your
specific model, a Communication Setup screen like that shown
at left will appear if you have not already connected to your
transmitter via USB (note fields are blank and a red status
message appears).
Connect your Windows PC to the unit via isolated USB and its
model-serial information will appear in the Device select scroll
field as shown in the second screen at left.
Note that if you have a connection path to more than one unit
via a USB hub, you can use the Device scroll field to select a
different unit using the serial number suffix of the Device Model
to discern one unit from another.
Once you have selected a device/serial, click the [Open] button
to open communication with the unit.
After clicking [Open], the selected unit’s Model, Serial Number,
Manufacturer, and connection Status will be displayed as
shown in the third screen at left.
After you connect USB and “Open” communication with a unit,
the Status field indicates “Device opened successfully” as
shown in third screen at left.
At this point, you can click the “Configuration” tab to begin
configuring the unit, “Calibration” to calibrate an input or
output channel, or “Diagnostics” to optionally test its operation
by polling its input channels.
Note that you must have power connected to output loop 1 of
the transmitter, even if connected via USB. If you are in dual
transmitter or splitter mode, you must have power connected
in both output loops of the unit. You will not be able to
configure, calibrate, or test a unit without loop power also
applied to at least output 1.
Note that you must have power connected to output loop 1
of the transmitter in any operating mode, even if
connected to USB. If you are in dual transmitter or splitter
mode, you must have power connected in both output
loops of the unit. You will not be able to configure,
calibrate, or test a unit without loop power also applied to
at least output 1.

Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: [phone] - 20 -
http://www.acromag.com
- 20 -
https://www.acromag.com
Configuration…continued
Configuration (Setup Unit Here)
IMPORTANT: DT models have three modes of operation: 1Dual
Transmitter, 2Single Transmitter, and 3Signal Splitter. The
Configuration Screen varies with the Operating Mode selected.
The second screen at left is for Single Transmitter mode, the third
screen at left is for Signal Splitter mode.
The initial Configuration screen returned represents the
connected module’s current configuration and operating mode
before making changes. Otherwise, you could have loaded the
configuration from a saved file, or you may have changed a field.
You can always click [Get I/O Config] to retrieve the connected
module’s current configuration at any time.
Note that if you make any changes to the configuration indicated,
the only way to preserve the changes is to write them to the
device by clicking [Send I/O Config], or to save them to a file by
clicking “File” in the upper left-hand corner of the screen.
NOTE: Note that each channel of these dual transmitter models
has two input paths that differ by the nominal range supported.
For the DT236, the first input path A is at TB1-1/TB3-1 (leftmost
terminal of TB1/TB3) and intended for DC current only. The
second input path B is at TB1-3/TB3-3 (the rightmost terminal of
TB1/TB3) and intended for DC voltage only. For both the DT237
& DT238 models, each input path supports a different range of
DC voltage input for the channel. Your input range selection will
determine which terminal you must wire your input to. Note that
the center terminal is always the channel signal return for both
input paths.
Select the Operating Mode...
The DT transmitters are quite versatile in that they support three
different operating modes: Dual Transmitter, Single CH1
Transmitter, and CH1 Signal Splitter. You can change its mode of
operation at any time to suit your application
Select the Input Type/Range…
Input Type refers to the nominal input range. Different Input
ranges may use different signal paths (see NOTE above). The first
terminal A of a DT236 channel supports DC current (TB1/TB3-1)
of ±20mA, 0-20mA, 4-20mA, 0-11.17mA, and ±1mA. Its third
terminal B (TB1/TB3-3) supports DC voltage ranges of ±0.5V, 0-
500mV. The first and third terminals of the DT237 & DT238
models (TB1/TB3-1 and TB1-3/TB3-3) each support different
nominal DC voltage ranges. Signal return is wired to the middle
terminal between them (TB1/TB3-2).