Acromag TT236-0600 User manual

USB Programmable, DIN Rail Mount
Thin Transmitter
Model TT236-0600, Two-Wire Transmitter,
DC Current or Low DC Voltage Input
USER’S MANUAL
ACROMAG INCORPORATED Tel: [phone]
30765 South Wixom Road Fax: [phone]
Wixom, MI 48393-2417 U.S.A. email: [email protected]
Copyright 2018, Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice. 8500940J

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Table of Contents
GETTING STARTED
DESCRIPTION.......................................................................................................4
Key Features........................................................................................................................4
Application..........................................................................................................................4
Mechanical Dimensions .......................................................................................................5
DIN Rail Mounting & Removal..............................................................................................5
ELECTRICAL CONNECTIONS............................................................................6
Input Connections................................................................................................................7
Output/Power Connections .................................................................................................8
Earth Ground Connections .................................................................................................10
USB Connections................................................................................................................11
CONFIGURATION SOFTWARE...................................................................... 12
Quick Overview –Android .................................................................................................12
Quick Overview –Windows ...............................................................................................13
OPERATION STEP-BY-STEP.......................................................................... 15
Connections.......................................................................................................................15
Configuration.....................................................................................................................16
Calibration (Optional) ........................................................................................................19
BLOCK DIAGRAM ............................................................................................. 21
How It Works.....................................................................................................................21
TROUBLESHOOTING....................................................................................... 22
Diagnostics Table...............................................................................................................22
Service & Repair Assistance ...............................................................................................24
ACCESSORIES .................................................................................................... 25
Software Interface Package................................................................................................25
USB Isolator.......................................................................................................................25

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USB A-B Cable....................................................................................................................25
USB A-mini B Cable............................................................................................................25
USB OTG Cable ..................................................................................................................26
End Stops...........................................................................................................................26
SPECIFICATIONS .............................................................................................. 27
Model Number ..................................................................................................................27
Input .................................................................................................................................27
Output...............................................................................................................................29
USB Interface.....................................................................................................................30
Enclosure & Physical..........................................................................................................31
Environmental...................................................................................................................31
Agency Approvals ..............................................................................................................33
Reliability Prediction..........................................................................................................33
Configuration Controls.......................................................................................................34
REVISION HISTORY......................................................................................... 34
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.

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GETTING STARTED
DESCRIPTION
Symbols on equipment:
Means “Refer to User’s Manual
(this manual) for additional
information”
The TT236-06x0 is an ANSI/ISA Type II transmitter designed to interface with DC
Current (0-20mA/4-20mA), or Low Voltage DC (±0.5V/0-500mV) sensors, isolate the
input signal, and modulate a 4-20mA current signal to drive a two-wire current loop.
This unit is setup and calibrated using configuration software and a USB connection
to Windows-based PC’s (Windows XP and later versions only). The unit provides an
adjustable input range, input isolation, and variable input filtering.
Key Features
•Digitally setup and calibrated w/ Windows software via USB.
•Thin 12.5mm wide enclosure for high-density DIN-rail mounting.
•Supports both process current input and DC voltage input on same model.
•DC Current Input 1 for 0-20mA, 4-20mA, 0-11.17mA, and ±1mA.
•DC Voltage Input 2 for ±0.5V and 0-500mV.
•High measurement accuracy and linearity with 16-bit conversion.
•Adjustable input ranges.
•Extra output connections support optional sourced output wiring.
•Variable Input Filter Adjustment.
•Normal or Reverse Acting output.
•Convenient two-wire loop power with non-polarized output connections.
•Namur compliant loop current.
•Wide ambient temperature operation.
•Thoroughly Tested and Hardened For Harsh Environments.
•CE Approved.
•FCC Conformity Class B.
•Includes UL/cUL Class 1, Division 2 Approvals.
•Model TT236-0600 is ATEX/IECEx Certified for Explosive Atmospheres.
II 3 G Ex ec IIC T4 Gc -40oC ≤Ta ≤+80oC
DEMKO 15 ATEX 1561X IECEx UL 18.0091X
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.
This transmitter is designed for high-density mounting on T-type DIN rails. Units
may be mounted side-by-side on 12.5mm centers.
This model isolates a current or voltage input signal and can mate with grounded or
non-grounded sensors. It provides a 4-20mA output current linear with sensor
current or voltage.
The output signal is transmitted via a two-wire, 4-20mA current loop. The two-wire
current signal can be transmitted over long distances with high noise immunity. Its
inherent live-zero 4mA offset current offers built-in output fault detection, should
an output wire break. Extra connection screws at the output allow it to be
optionally wired for a “sourced” 4-20mA output configuration (see Optional Output
Wiring).
!

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Mechanical Dimensions
Units may be mounted to 35mm
“T” type DIN rail (35mm, type
EN50022), and side-by-side on 0.5-
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.
DIN Rail Mounting & Removal
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.
99.0
(3.90)
114.5
(4.51)
12.5
(0.50)
DIMENSIONS ARE IN MILLIMETERS (INCHES)

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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 14–26 AWG (2.08–0.13mm2) solid or stranded
wire with a minimum temperature rating of 85oC. 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. This model allows up to
±1V input signals to be wired to TB1, and up to ±10V input signals to be wired to
TB2. Only one input may drive the current output. 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 (0.5-0.6Nm torque). Since common mode voltages can
exist on signal wiring, adequate wire insulation should be used and proper wiring
practices followed. As a rule, output wires are normally separated from input wiring
for safety, as well as for low noise pickup.
T-Rail
35mm DIN Rail
SCREWDRIVER SLOT
FOR REMOVAL FROM
"T" TYPE DIN RAIL
TILT MODULE UPWARD TOWARDS RAIL
AND HOOK ONTO UPPER LIP OF RAIL.
ROTATE MODULE DOWNWARD TO
ENGAGE SPRING CLIP ONTO LOWER
LIP OF RAIL.
TOP
BOTTOM
(INPUT SIDE)
(OUTPUT SIDE)
TT2XX MODULE DIN RAIL MOUNTING AND REMOVAL
SPRING CLIP
USE SCREWDRIVER TO REMOVE
MODULE FROM RAIL AS SHOWN
TT2XX MODULE
!

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Important –End Stops: For hazardous location installations (Class I, Division
2 or ATEX/IECEx Zone 2) it must use two end stops (Acromag 1027-222) to
secure the module(s) to the DIN rail (not shown).
Input Connections
Sensor wires are wired directly to transmitter input terminals at the bottom of the
module (the spring-loaded DIN clip side), as shown in the connection drawing
below. Observe proper polarity when making input connections.
•Transmitter input signal is isolated from output.
•DC Current is wired to the upper terminal blocks (TB1).
•DC Voltage is wired to the lower terminal blocks (TB2).
•Inputs are polarized “+” and “-“. The positive input is on the left and
labeled “+”, and the negative input is to its right. Observe proper polarity.
See connection figure below.
•Only one input, current or voltage, may drive the output at one time.
INPUT
TERMINALS
+
+-
INPUT SIDE OUTPUT SIDE
MODEL TT236-0600
TB1
TB2
BOTTOM VIEW
(INPUT SIDE)
DIN RAIL SPRING CLIP
2
1
43
DIN RAIL SPRING CLIP
DC CURRENT
DC VOLTAGE
1
2
3
4
(2-WIRE ONLY)
WIRE CURRENT TO TB1
MODEL TT236-0600 INPUT SENSOR WIRING
OPT SHLD GND
INPUT
TERMINALS
-
+
+
TB1
TB2
FRONT
DC CURRENT ONLY
DC VOLTAGE ONLY
-
-
SHIELDED CABLE
CURRENT
DC
(mA)
I
SHIELDED CABLE
VOLTAGE
DC
(Volts) -
+
V V
WIRE VOLTAGE TO TB2
INPUTS SHARE COMMON AND ARE NOT
ONLY ONE INPUT, CURRENT OR VOLTAGE,
MAY DRIVE THE OUTPUT AT ONE TIME.
INPUTS ARE ISOLATED FROM THE OUTPUT.
ISOLATED FROM EACH OTHER.
OPT SHLD GND
!

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Output/Power Connections
This transmitter has an ANSI/ISA Type 2 output in which the unit’s power and
output signal share the same two leads, and the transmitter output has a “floating”
connection with respect to earth ground. Connect a DC power supply and load in
series in the two-wire loop as shown in the drawing below.
•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).
•Loop supply voltage should be from 12-32V DC with the minimum voltage level
adjusted to supply over-range current to the load, plus 11V MIN across the
transmitter, plus any transmission line drop.
•Variation in power supply voltage between the minimum required, and 32V
maximum, has negligible effect on transmitter accuracy.
•Variation in load resistance has negligible effect on output accuracy, as long as
the loop supply voltage is set accordingly.
•Note the traditional placement of earth ground in the current loop. The
transmitter output varies off this ground by the voltage drop in the load
resistance and lead-wire.
The traditional loop-powered “sinking” output connections are shown above.
Shielded twisted-pair wiring is often used at the output to connect the longest
distance between the field transmitter and the remote receiver as shown. The
output of this transmitter fluctuates relative to earth ground by the voltage drop in
the load and connection wire. This makes it flexible in the way it connects to
various “Receiver” devices.
INPUT SIDE OUTPUT SIDE
MODEL TT2XX-0600
MODEL TT2XX-0600 OUTPUT/POWER WIRING
+
-
+
IDC SUPPLY
(12-32V)
+
-
EARTH
GROUND
I
I
RLOAD
-
THIS TRANSMITTER IS CURRENT LOOP POWERED
4-20mA
OUTPUT
TERMINALS
(UPPER LEVEL)
+-
OPT "C" TERMINALS
(SEE OPT TB4 WIRING)
ARE COMMON
CC
NOTE: OUTPUT TERMINALS ARE NOT POLARIZED AND
PLUS & MINUS LABELS ARE FOR REFERENCE ONLY.
OPTIONAL WIRING TERMINALS C ARE HELD IN
COMMON AND USED FOR "SOURCING" LOOP WIRING.
SEE OPTIONAL OUTPUT WIRING DIAGRAM.
TB3
TB4
TOP VIEW
(OUTPUT SIDE)
+
-
6
5
65 TWISTED PAIR
7 8 87
TRADITIONAL LOOP-POWERED "SINKING OUTPUT" CONNECTIONS
TB3 SHIELDED

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Output/Power
Connections…
In most installations, the loop power supply will be local to either the transmitter,
or local to the remote receiver. Common receiver devices include the input channel
of a Programmable Logic Controller (PLC), a Distributed Control System (DCS), or a
panel meter. Some receivers already provide excitation for the transmitter loop
and these are referred to as “sourcing inputs”. Other receivers that do not provide
the excitation are referred to as “sinking” inputs, and these will require that a
separate power supply connect within the loop. These types of receivers are
depicted below:
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.
TIP - Ripple & Noise: Power supply ripple at 60Hz/120Hz is normally reduced at the
load by the transmitter, but additional filtering at the load can reduce this ripple
further. For large 60Hz supply ripple, connect an external 1uF or larger capacitor
directly across the load to reduce excessive ripple. For sensitive applications with
high-speed acquisition at the load, high frequency noise may be reduced
significantly by placing a 0.1uF capacitor directly across the load, as close to the load
as possible.
TIP - Inductive Loads: If the two-wire current loop includes a highly inductive load
(such as an I/P current-to-pressure transducer), this may reduce output stability. In
this case, place a 0.1uF capacitor directly across the inductive load and this will
typically cure the problem.
INPUT SIDE OUTPUT SIDE
MODEL TT2XX-0600
MODEL TT2XX-0600 OUTPUT WIRING
OUTPUT
TERMINALS
+-
COMMON CC
TB3
TB4
TOP VIEW
(OUTPUT SIDE)
+
-
6
5
65
87
"SINKING OUTPUT" CONNECTIONS WITH
LOOP+
LOOP-
TB4
TB3
+
-
TWISTED PAIR
TERMINALS
I
I
POWER LOCAL TO THE RECEIVER
The 24V DC Excitation is
Provided by the Card
+
RCV
DCS/PLC SINKING
24VDC
Two-Wire Output Connections to the Input Card of a Distributed Control
System or Programmable Logic Controller.
+
-
24VDC POWER SUPPLY
I
I
COMMON TWO-WIRE TRANSMITTER CONNECTION TO "SOURCING" AND "SINKING" INPUT RECEIVERS
+
-
INPUT CARD
-
+
RCV
+
-
P
DCS/PLC SOURCING
24VDC
INPUT CARD
+
-
OR
SOURCING INPUT RECEIVER SINKING INPUT RECEIVER
The 24V DC Excitation is Provided
by a Separate Power Supply

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Output/Power
Connections…
This model includes two extra terminal connections at TB4 marked “C” which
provide a convenient wiring point for a “sourcing” wiring variation as shown below.
Internally, these two terminals are connected in common with each other and do
not connect to the internal circuit. Use of these terminals in your wiring scheme
allows you to connect external power local to the transmitter and form a “sourcing”
entity from this “sinking” output as shown.
Earth Ground Connections
The unit housing is plastic and does not require an earth ground connection, except
where the optional input cable shield is terminated on the unit. In this way, the
input cable shield connection is shunted to the earth ground applied at the “G”
terminal via an internal isolation capacitor. Internal circuitry is electrically isolated
from this earth ground connection. If the transmitter is mounted in a metal
housing, an earth ground wire connection to the metal housing’s ground terminal
(green screw) is usually required using suitable wire per applicable codes. See the
Electrical Connections Drawing for Output/Power connections and note the
traditional position of earth ground for the two-wire output current loop. Earth
ground is normally applied at the output loop power minus terminal and in common
with the loop load or loop receiver minus. The 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.
•Respect the traditional position of earth ground in a two-wire current loop and
avoid inadvertent connections to earth ground at other points, which would
drive ground loops and negatively affect operation.
•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 earth grounds its USB port and this makes contact with both the USB
signal and shield ground which is held in common to the input circuit ground of
this transmitter).
INPUT SIDE OUTPUT SIDE
AND MODEL TT2XX-0600
MODEL TT2XX-0600 OPTIONAL OUTPUT WIRING
OUTPUT
TERMINALS
+-
COMMON CC
TB3
TB4
TOP VIEW
(OUTPUT SIDE)
+
-
6
5
65
7
8
87
OPTIONAL "SOURCING OUTPUT" CONNECTIONS WITH
LOCAL EXTERNAL 3-WIRE POWER FORM
A SOURCING OUTPUT RELATIVE TO THE
LOOP+
LOOP-
OPTIONAL COMMON CONNECTIONS WITH
TB4
TB3
+
24VDC +
-
LOCAL 24VDC
-
POWER SUPPLY
R
I
+
-
LOAD
REMOTE RECEIVER/LOAD
+
-
TWISTED PAIR
C
C
TERMINALS
I
I
I
I
I
I
POWER LOCAL TO TRANSMITTER
REMOTE SINKING LOAD.

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USB Connections
This transmitter is setup, configured, & calibrated via configuration software that
runs on a Windows-based PC connected to the unit via USB (Windows XP or later
required). Refer to the following drawing to connect your PC or laptop to the
transmitter for the purpose of reconfiguration and calibration using this software.
WARNING: The intent of mating
USB with this transmitter is so that
it can be conveniently setup 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 setup.
IMPORTANT: All USB logic signals to the transmitter are referenced to the potential
of its internal signal ground. This ground is also held in common with the USB
ground and shield ground. The potential of the transmitter’s current output pin
(output minus) relative to earth ground will vary according to the load current and
load resistance (net IR drop). Without isolation, this IR drop would drive a potential
difference between the normally grounded current loop and the grounded USB
connection at the PC, causing a ground loop that would inhibit setup and
calibration, and may even damage the transmitter. This is why an isolated USB
connection is recommended. Alternatively, you could avoid the use of an isolator if
a battery powered laptop was used to connect to the transmitter, and the laptop
has no earth ground connection, either directly or via a connected peripheral.
PERSONAL COMPUTER
RUNNING WINDOWS OS
1 METER CABLE
USB-A MALE
TO HOST USB PORT
HOST
USB
HOST USB SERIAL
PORT CONNECTOR
AT BACK OF PC
CONFIGURATION
SOFTWARE
ACROMAG
HOST PC RUNNING
USB-B MALE
DEVICE
CONNECT
PC
CONNECT
POWER RESET
CONNECTION
Acromag
THE LEADER IN INDUSTRIAL I/O
R
USB-A MALE
USB-ISOLATOR
USB MiniB Socket
(Front-Panel of Module)
ANY MODEL TT2XX TRANSMITTER
USB MiniB MALE
TT SERIES USB TRANSMITTER CONNECTIONS
LED
(RECOMMENDED)
USED FOR CONFIGURATION AND CALIBRATION OF THE TRANSMITTER IN A SAFE OR ORDINARY LOCATION
CABLE Model 4001-113
MODEL NO. - USB-ISOLATOR
CABLE Model 4001-112
Refer to Configuration Software Kit, Model TT-SIP, which includes:
1 ea, Model 4001-113 USB Cable
1 ea, Model 4001-112 USB Cable
1 ea, Model USB-ISOLATOR
1 ea, Model 5040-944 TT CDROM Software
!
Note: Output/Power to Transmitter must
be applied before USB connection
(See Output/Power Connections).

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CONFIGURATION SOFTWARE
Quick Overview –Android
This transmitter can be configured and calibrated via the Acromag Agility™
Config Tool App. This software can be downloaded free of charge from the
Google Play store at play.google.com. To connect to this transmitter, a USB
OTG (On-The-Go) cable (Acromag 5028-565) and USB A to Mini-B cable
(Acromag 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. The screen is divided into
three tabs for this model. A short description of each tab follows.
Connection Screen Setup –DEVICE SELECT (First Connect to Unit Here)
•Select from connected transmitters by tapping the [Select Device] button.
This will bring up a list of attached devices. Select the desired device and
tap the Connect button to open the device.
•To view wiring diagrams of a particular transmitter, tap the [Wiring
Diagram] button and select the desired model. Swipe left or right to view
more diagrams. No connection is required to view the diagrams.
•Android requires user permission to access external hardware. If the
Device List displays “No Device Permission”, select this device and when
prompted to give permission to access the USB device, tap [OK].
Configuration Tab –CONFIGURE I/O
•Once connected, the app will automatically read your transmitter and
display its current configuration.
•Changing any option on this page will send the changes to the transmitter
instantly. The device status 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 will guide the setup to properly calibrate the
transmitter. 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 miscalibrate a transmitter.

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Quick Overview –Windows
Click “Open” to connect to the
TT236-0600 and your screen will look
similar to the following:
This transmitter can be configured and calibrated via its Configuration
Software and a USB connection to your PC or laptop. The configuration
software can be downloaded free of charge from our web site at
www.acromag.com. This software is also included on a CDROM bundled with
the Configuration Kit TT-SIP (see Accessories section). For this model, look for
program TT236Config.exe. This software is compatible with XP or later
versions of the Windows operating system.
The initial configuration software screen for this model is shown at left. The
Configuration screen is divided into three pages as follows: Communication
Setup, I/O Config/Test, and Calibration. A short description of each of these
pages follows.
Communication Setup –DEVICE SELECT (First Connect to Unit Here)
•Select from connected transmitters using the Device scroll field and
Open/Close communications with them.
•Display the Model, Serial Number, and Manufacturer of the connected
transmitter, and report the Status of the connection communication.
This section is used to select a connected transmitter, and open/close
communications with it. Device connection Status is also indicated here,
along with the connected transmitter’s ID info (Model, Serial Number, &
Manufacturer).
I/O Config/Test –CONFIGURE I/O (Reconfigure and/or Test the Unit Here)
•You can click the [Get I/O Config] button to retrieve the I/O configuration
of the currently connected transmitter.
•Select the Input Range. You can select current ranges ±20mA, 0-20mA, 4-
20mA, 0-11.17mA, or ±1mA for inputs wired to TB1, or voltage ranges
±0.5V and 0-500mV for inputs wired to TB2.
•Set the level of digital filtering to High, Medium, or Low. Note that the
corresponding I/O response time will vary with filter selection to 1200ms,
150ms, and 50ms respectively.
•View the unit’s configuration communication status in the Status field.
•Use the I/O Scaling fields to specify the specific input range endpoints
that are to correspond to the 4mA and 20mA output endpoints.
•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.
For detailed configuration and calibration procedures, see the Operation
Step-By-Step section of the Technical Reference on page 17 of this manual.
Quick Overview - Windows..

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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 to point to a field or
control to get a Help message pertaining
to the item you pointed to.
I/O Config/Test - TEST I/O (Optional, Verify Unit Operation Here)
After making I/O configuration changes, you can use the TEST I/O controls to
Start/Stop Polling the input channel, as required to check your input readings.
•Click [Start Polling] to periodically read your input channel and validate its
operation. Click [Stop Polling] to stop polling the input channel. Note the
simulated red lamp left of the button flashes slowly when the software is
polling the input channel.
CALIBRATION (Calibrate the Input and/or Output if Needed)
This unit has already been factory calibrated. If you encounter excessive error,
you can click the Calibration tab to display the Calibration control page shown
in the second screen at left.
To calibrate the Input or Output stage of this model, simply click the
respective Input or Output “Instructions”button to get started and follow the
on-screen prompts.
Input…
First set the Input Range to calibrate from the I/O Config/Test page and be
sure to click the [Send I/O Config] button before attempting calibration. On
the Calibration page, click the [Input Cal Instructions] button to begin input
calibration.
When you click the [Zero] or [Full Scale] buttons of the Input Calibration
section, you will be prompted to apply a specific current (at TB1), or voltage
level (at TB2), to the selected channel. Once you have applied this signal to
the correct input terminals, click the [OK]button of the prompt to calibrate
and follow the on-screen instructions.
Output…
Click the [Output Cal Instructions] button to begin output calibration. You will
be prompted to adjust the input signal as required to drive the output to
precisely 4.000mA (Zero), or 20.000mA (Full-Scale). Then once the output is
set to zero or full-scale, you simply click the corresponding [Zero] or [Full-
Scale] button of the CALIBRATION - Output section to set the output range
zero or full-scale endpoint.
Factory Settings (Use Only In Case of Trouble or for Sanitation Purposes)
•Restores a transmitter to its original factory calibration.
•Restores a transmitter to its initial factory configuration.
You can click the [Restore Factory] buttons if you ever misconfigure or
miscalibrate a transmitter in such a way that its operation appears erratic.
Calibration Status (Bottom of Screen)
•Displays communication status messages for the calibration process.
The CALIBRATION STATUS message bar at the bottom of the screen will
display status messages relative to calibration.

Acromag, Inc. Tel: [phone] - 15 -
http://www.acromag.com
- 15 -
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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: Your input source and output meter must be accurate beyond the unit
specifications, or better than ±0.1%. A good rule of thumb is that your equipment
accuracy should be four times better than the rated accuracy you are trying to
achieve with this transmitter.
1. Connect Input: Refer to Input Connections on page 7 and connect a precision
current source to TB1, or a precision voltage source to TB2, according to your
application input range. Your signal source must be adjustable to the nominal
range zero and full-scale values.
2. Connect Output/Power: Refer to Output/Power Connections of pages 8 and 9
and wire an output current loop to the transmitter as illustrated. You will need
to measure the output current accurately in order to calibrate the unit. You
could connect a current meter in series in this loop to read the loop current
directly (not recommended). Alternatively, you could simply connect a
voltmeter across a series connected precision load resistor in the loop, and
accurately read the output current as a function of the IR voltage drop
produced in this resistor (recommended). In any case, be sure to power the
loop with a voltage that is minimally greater than the 11V required by the
transmitter, plus the IR drop of the wiring and terminals, plus the IR drop in the
load. To compute the IR drop, be sure to use a current level that considers the
over-scale current (up to 24mA).
Loop Power Supply Voltage: Make sure your voltage level is at least 11V plus
0.020*load_resistance. Ideally, it should be great enough to drive the 24mA
over-range current into your load (i.e. up to 11V+ 0.024*Rload, assuming line
drop is negligible and the maximum possible over-range is considered). Always
apply power to the transmitter output loop even when connected to USB.
3. Connect to PC via USB: Refer to USB Connections of page 11 and connect the
transmitter to the PC using the USB isolator and cables provided in the
Configuration Kit TT-SIP.
Now that you have made your input, output/power, and USB connections and
applied power to your loop, you can execute the TT236Config.exe software to
begin configuration of your unit (software is compatible with XP or later
versions of the Windows operating system).
Connect Input
Connect Output/Pwr
Connect PC/USB
Configure
Optional
Calibrate I/O

Acromag, Inc. Tel: [phone] - 16 -
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Configuration
After executing the Acromag Configuration software for this
model, the screen shown at left will appear if you have not
already connected to your transmitter via USB (note fields are
blank under these conditions).
Connect your PC to the unit via USB and its model-serial
information will appear in the Device scroll field as shown in the
second screen at left.
If you are connected to more than one unit via a USB hub, you
can use the Device scroll field to select another unit using the
serial information suffix of the Device Model to discern one unit
from another.
Once you have selected a device, 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 first screen of the next page.

Acromag, Inc. Tel: [phone] - 17 -
http://www.acromag.com
- 17 -
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Configuration…
After you connect USB and “Open” communication with a unit, the
Status field indicates “Device opened successfully” as shown in first
screen at left.
At this point, you can click the “I/O Config/Test” tab to begin
configuring the unit, or to optionally test its operation.
When you click the “I/O Config/Test” tab, the software retrieves the
unit’s current configuration and displays it within the I/O Config/Test
page similar to the second screen shown at left. If you make changes
to this Configuration Screen, but do not write them to the unit, you can
retrieve the module’s current configuration by clicking the [Get I/O
Config] button at the top of this screen.
This model has two input channels, one for current, and one for
voltage. DC current input is wired to TB1 (the upper terminal block),
while DC voltage input is wired to TB2 (the lower terminal block). Only
one input may drive the output current loop at one time and this is
determined by your input range selection.
Select the Input Range…
You can select DC Current ranges of ±20mA, 0-20mA, 4-20mA, 0-
11.17mA, or ±1mA, and these signals must be wired to TB1. You can
also select DC Voltage ranges of ±0.5V or 0-500mV, and these signals
are wired to TB2.
Note that the any input range you pick can be rescaled to the output,
allowing you to use only a portion of the selected input range to drive
the 4-20mA output current loop, if desired. However, resolution will
decrease proportionally as you rescale the input smaller than the
nominal input range. If you reduce the input range too far, this will
reduce the signal resolution, magnify potential error, and degrades the
signal-to-noise ratio of the input channel.
Select the Input Filtering…
You may select the level of digital filtering to apply to the input channel
as Low, Medium, or High. The respective I/O response times are
indicated in parenthesis next to your filter selection. Note that higher
filter levels result in lower average noise, but with a slower I/O
response time.
Note that if you make any changes to this screen, which represents the
current configuration of the connected module, the only way to
preserve your changes is to either write it to the device by clicking
[Send I/O Config] after completing your changes, or by saving it to a
file by clicking “File” in the upper left-hand corner of the screen.
Note that you should already have loop power connected
to the transmitter. You will not be able to calibrate a unit
or test it without loop power also applied.

Acromag, Inc. Tel: [phone] - 18 -
http://www.acromag.com
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Configuration…
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 click to point to a field or control
to get a Help message pertaining to the item
you pointed to.
Select the Input/Output Scaling…
You may rescale selected input range to use only a portion of the
range to drive the 4-20mA output if desired. But be careful not to
reduce the range too much, as resolution is proportionally diminished
and noise/error is magnified.
In the corresponding I/O Scaling field, set the input signal
minimum/zero value to correspond to 4mA of output current, and the
input signal maximum/full-scale value to correspond to 20mA of
output current. Note that some under and over-range is built into
each range selection. You can optionally swap input levels to
configure a reverse acting output response if desired.
If the input zero and full-scale points are chosen too close together,
performance will be degraded.
Once you have made your configuration selections, click the [Send I/O
Config] button to write them to the module. You can read the status
of your communication with the module in the Configure I/O Status
field. Alternately, you could click “File” in the upper left hand corner
to save the settings to a file on your PC, for reference later, or for
duplicating your configuration on other modules.
At this point, you can test the module’s operation by clicking the [Start
Polling] button to trigger the software to periodically read the input
and display its value in the field to the right of this button. Note the
simulated lamp next to the button flashes slowly each time it samples
the input. Click the [Stop Polling] button to stop polling the input
channel before moving onto the next page.

Acromag, Inc. Tel: [phone] - 19 -
http://www.acromag.com
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Calibration (Optional)
CAUTION-Input Calibration: You must input values
within your selected input range. Driving input levels
outside of the selected input range will not be
acceptable for calibration of zero or full-scale. Since
input levels cannot be validated during field
calibration, incorrect signal levels will produce an
undesired output response.
This unit has already been factory calibrated. If you have
configured your unit and encountered excessive error, you can
click the Calibration tab to display the Calibration control page
shown at left.
IMPORTANT: This unit has already had its input and output
channels factory calibrated with a high level of precision. If you
attempt to recalibrate the input or output channel, you could
degrade its performance if you do it improperly, or you use lower
grade equipment. Consider your decision to recalibrate carefully.
Calibration of this model is a simple two-part process initiated by
simply clicking the respective Input or Output [Instructions]
button to get started and follow the on-screen prompts.
CALIBRATION - Input
Before attempting to recalibrate the input, first set the Input
Range to calibrate from the “I/O Config/Test” page. Additionally,
make sure you write your selections to the unit by clicking the
[Send I/O Config] button of that page.
Click the [Input Cal Instructions] button to begin input calibration
and enable the Input [Zero] and [Full-Scale] buttons.
Click the Input [Zero] button and you will be prompted to input
the minimum value of your selected input range at the
appropriate input channel (note that it uses the nominal range
endpoints, not the scaled range endpoints). If you have selected
a DC Current range, you must drive -20mA, 0mA, 4mA, or -1mA at
TB1 (the upper input terminal block), depending on the Input
Range selected. If you have selected a DC voltage range, you
would drive -0.5V or 0V to TB2 (the lower input terminal block).
The software does not use your scaled zero, but the zero of the
nominal input selected. Once you input the zero precisely, click
the [OK] button of the prompt to calibrate zero and then follow
the on-screen prompt.
Click the Input [Full-Scale] button and you will be prompted to
input the maximum value of your selected input range at the
appropriate input channel. If you have selected a DC Current
range, this will be 20mA or 1mA at TB1, depending on the Input
Range selected. If you have selected a DC voltage range, this will
be 0.5V at TB2. The software does not use your scaled full-scale,
but the full-scale of the nominal input range selected. Once you
input full-scale precisely, click the [OK] button of the prompt to
calibrate full-scale and then follow the on-screen prompt.

Acromag, Inc. Tel: [phone] - 20 -
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Calibration…
CALIBRATION –Output
Click the [Output Cal Instructions] button to begin output
calibration and enable the Output [Zero] and [Full-Scale] buttons.
First adjust the input signal as necessary to drive the output
current to precisely 4.000mA. Be sure to measure this level
accurately or performance will be degraded. After driving the
output to 4.000mA, click the Output [Zero] button of the
Calibration Output section to calibrate the output zero level.
Next adjust the input signal as necessary to drive the output
current to precisely 20.000mA. Be sure to measure this level
accurately or performance will be degraded. After driving the
output to 20.000mA, click the Output [Full-Scale] button of the
Calibration Output section to calibrate the output full-scale level.
If following calibration, your output acts erratic or appears
imprecise, you may need to repeat input or output calibration,
being very careful to take accurate measurements and input
correct signal levels. If you are measuring voltage across an
output load resistance to measure the current level
(recommended), make sure that you use exact resistance when
calculating the measured loop current. Also when rescaling,
make sure that you have adequate input span, as “too-tight”
input spans have diminished resolution and will magnify error.
Factory Settings
You can use the [Restore Factory Calibration] button to restore
the transmitter’s original factory calibration if you think you made
an error during recalibration, have degraded its performance, or if
the I/O channel appears erratic.
You can use the [Restore to Factory Default] button to return the
unit to its original factory state (see Specifications Reference Test
Conditions) and configuration settings. This does not restore
calibration, only configuration. Alternately, this button can be
used as a sanitation tool to restore the unit to its initial
configuration.
Calibration Status
This field displays calibration status messages like “No Error”,
“Transfer Error”, and “Timeout Error” during calibration. If you
encounter a Transfer or Timeout Error, you may have to repeat
the calibration process.