Elseta IOMOD 8AI User manual

ELSETA
IOMOD 8AI
User manual
Elseta
08/09/2021
V1.3

IOMOD 8AI
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V1.3 | ELSETA |
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COPYRIGHTS AND TRADEMARKS
Elseta is a trademark of UAB Elseta and identifies products manufactured by UAB Elseta. All the
product copyrights belong to UAB Elseta. These documents and product properties cannot be
changed without the knowledge and written consent of UAB Elseta. These documents may be
modified by UAB Elseta without additional notice.
DECLARATION OF CONFORMITY
(in accordance with ISO / IEC Guide 22 and EN Section 45014)
Manufacturer: UAB Elseta
Address of the manufacturer L. Zamenhofo str. 3 LT Vilnius, Lithuania
We claim that:
The device IOMod 8AI
Conforms to the following standards:
EMC:
Radiation EN 55022 (Class A)
1 emitted radiation (30-1000MHz)
Second radiation conductors (0.15-30 MHz)
EN 50082-1 immunity test
1 IEC 801-3: Radio-frequency electromagnetic field
2 IEC 801-2: Electrostatic discharge.
3 IEC 801-4: Quick periodic electrostatic discharges
Additional information:
"The device complies with the Low Voltage Directive 73/23/EEC and EMC Directive 89/336/EEC.
Device assembly complies with the RoHS Directive.
Manufacturer contact:
Equipment quality controller
UAB “Elseta"
Address: L. Zamenhofo g. 3, LT-06332, Vilnius, Lithuania
Phone: [phone]
E-mail. [e-mail]

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SAFETY REQUIREMENTS
These equipment operating notes must be met for your personal safety as well as to avoid damage
to the equipment. These notes are marked with a warning triangle symbol and the various degrees
of risk of falling within signs. All work related to electronic systems design, installation,
commissioning, adjustment and maintenance should be carried out in accordance with the safety
requirements.
SYMBOLS USED BY USER MANUAL
Danger - important notice, which may affect the safety of the user or device.
Attention - notice on possible problems that may arise in individual cases.
Information Notice - the information that is useful advice or special places.
Warning of the danger. The work may only be performed by a qualified
professional. Equipment installation, commissioning and maintenance may only
be performed by a qualified professional authorized to perform commissioning,
grounding and labeling devices, systems and circuits. The person must be aware
of occupational safety in the workplace, need to understand the equipment
components and electrical equipment, have the knowledge and skills to identify
a component beneath the voltage.
To maintain the equipment it is necessary to always turn off the power supply
before doing installing or dismantling works. It must be kept in mind that even
standalone equipment can have a common ground connection. Power supply,
cables and interconnect components must always be inspected before
connecting.
This product cannot be implemented or resold to install in areas that are marked
as high-security such as nuclear power plants, aircraft navigation, military
equipment, transport traffic in management. In such areas, equipment failure can
result in of nature damage and human injury.
Do not operate the equipment under extreme weather conditions as they may
affect the operation of the equipment.

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TABLE OF CONTENTS
COPYRIGHTS AND TRADEMARKS 2!
DECLARATION OF CONFORMITY 2!
SAFETY REQUIREMENTS 3!
SYMBOLS USED BY USER MANUAL 3!
1.!Introduction 5!
2.!Features 5!
3.!Operational information 5!
a.!Common configuration information 5!
b.!MODBUS operational information 6!
Supported MODBUS functions 7!
02 (0x02) Read Input Status 7!
04 (0x04) Read Input Registers 7!
Modbus register table 7!
Read Input Status 7!
Read Input Registers 7!
c.!IEC 60870-5-103 operational information 7!
4.!Technical information 8!
5.!Mounting and installation guide 9!
a.!IOMod 8AI RS485 interface 9!
b.!IOMod 8AI inputs 10!
6.!Configuration over USB 12!
a.!Driver installation 12!
b.!IOMod configuration via PuTTY terminal 13!
Modbus Main menu 14!
IEC-60870-5-103 Main Menu 14!
Individual Channel Configuration Menu 15!
c.!Measurements’ calibration 16!
d.!Protocol simulation over USB 17!
e.!Firmware upgrade over USB 17!
7.!Testing With “THE VINCI” software 19!
8.!Information of the equipment manufacturer 21!
9.!Document history 22!

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V1.3 | ELSETA | Introduction
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1. Introduction
IOMod 8AI is a compact-sized stand-alone Modbus (RTU) or IEC-60870-5-103 analog input
controller. IOMod can be used for industrial applications where digital signaling is used and robust
communication is needed. IOMod is an ideal solution for applications such as data acquisition,
observation, process monitoring, testing and measurement at remote places. It is controlled over
Modbus or IEC 60870-5-103 protocol, and can be used with any SCADA system.
2. Features
● 8 analog inputs, each configurable separately
● All inputs are capable of measuring electrical voltage or current
● Inputs can be recalibrated according to the needs of a user
● RS485 communication
● LED input indications, + Data transmission (Rx and Tx) indication.
● Configurable over USB
● Drag-and-Drop firmware upgrade over USB
● A small sized case with removable front panel
● DIN rail mount
● Operating temperature: from -30 to +70°C
● Power Requirements: 12-24 VDC
3. Operational information
IOMod 8AI uses Modbus (RTU) or IEC 60870-5-103 protocol over RS485 interface. A protocol used
by a device can be changed by uploading corresponding firmware. Default communication settings:
9600 baud/s baud rate, 8N1 port configuration, Slave address - 1.
a. Common configuration information
1. Measurement type. A user can select measurement type (electrical current or voltage) on each
channel individually.
2. Sensitivity selection. To increase a resolution of input measurement capture, a user can define
in which range measurement will occur. The best resolution will be achieved within a shortest
selected range. For all possible configurations refer to Technical Information and
Configuration over USB described later in this document.
3. Measurement limits can be selected, which in turn set thresholds on underflow or overflow error
statuses. Also, if a scaled integer data type is selected, these limits will be converted to values
using limits stated in Casting data range for Modbus protocol.
4. Data type selection. A device can output float or scaled integer data types for each input
individually for Modbus. Modbus input register read will then show raw float value (in
milliamperes or millivolts) or scaled integer types. When a float data type is selected, each input
will be represented as two Modbus registers (32-bits). These values can be later converted to

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IEEE-754 standard-compatible float values.
5. Casting data range. A device is capable of converting measurements into desired decimal
values in a linear manner. For Modbus, a user can select between floating point data type –
which will return a raw measurement of either voltage or current and scaled integer type – which
conversion is freely definable. Note that the specification for IEC-60870-5-103 only lets 13-bit
signed measurands, therefore only cast representation of true value can be used with absolute
limits being [-4095, 4095].
Fig. 3.2 shows how raw measurement (current in this case) is converted to an integer type.
Conversion is done by defining measurement limits (from -25mA to 25mA) and casting data
range (from 0 to 100). Measurement limits define thresholds for overflow and underflow errors
respectively; casting data range defines limits (from 0 to 100) that value should be between after
recalculation. Such a recalculation can be used in applications that require measurements in
relative units such as percentage.
A device can round measurements to lower conversion limit (in this case – to zero) if a
measurement is near it: ±15% of measurement value (Fig. 3.2). Live zero correction is a useful
option for eliminating noise. As signals always have some noise level, such an option can
compensate it to get a true zero value.
Fig. 3.2. Conversion graph from raw measurement to cast integer
b. MODBUS operational information
Each input can be configured to represent 16-bit signed integer value or 32-bit float value. When the
float data type is selected, the value will be shown as two registers for one input. When the 16-bit
integer data type is selected, a value will be shown as one register. This means addresses of
individual input and the maximum number of readable registers can differ according to user
configuration.
Configure device over USB terminal. Modbus commands that can be used are shown in the table
below.

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Supported MODBUS functions
02 (0x02) Read Input Status
Used to read analog input overflow and underflow statuses. First 8 inputs show each input underflow
statuses (according to measurement limits option) and second 8 inputs show overflow statuses.
04 (0x04) Read Input Registers
Used to read measurements of at most 8 analog inputs. IOMod 8AI has 8 analog inputs from address
0 to address 15 (0000Fh). Different analog inputs can be cast in different data types configured over
a USB interface.
Modbus register table
Function
Register
Name
Description
Values range
02
00000-
0000F
Read Input
Status
Returns
overflow and
underflow
statuses of
each input.
First 8 shows
underflow
status, last 8
shows overflow
0 – OK, 1 -
error
04
00000-
0000F
Read Input
Registers
Returns Input
values
0-65535
(decimal)
of one
Register
c. IEC 60870-5-103 operational information
IOMod with IEC-60870-5-103 firmware uses a standard communication scheme. Initiation, control
messages and queries are initiated by a master (controlling station), while IOMod device (controlled
station) only answers requests and sends values. The first message sent by master should be
RESET CU to restart communication. When acknowledge (ACK) packet is sent from a slave device,
a master may proceed with acquiring General Interrogation and sending Time synchronization
packets.
When this initialization is complete, master should poll IOMod device with Class 1 and Class 2
requests. Class 2 is used when master polls for cyclic data. The controlled device responds when
spontaneous data exists and master then sends a request for Class 1. Controlled station responds
with a time-tagged message.
As IOMod 8AI doesn’t have any digital inputs, only analog ones, general interrogation returns
nothing. Values of measurements are returned cyclically without any additional request therefore
commands sent will be ignored.

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4. Technical information
System
1.
Dimensions
101 x 119 x 17.5 mm
2.
Case
ABS, black
3.
Working environment
Indoor
4.
Working temperature
-30 ÷ +70°C
5.
Recommended operating
conditions
5 – 60°C and 20 – 80%RH;
6.
Configuration
USB
7.
Firmware upgrade
USB – mass storage device
Electrical specifications
8.
Inputs
16-bit resolution;
Channel-Independent Programmable
Input Ranges:
● Voltage input:
○ Bipolar: ±10.24 V, ±5.12 V, and
±2.56 V
○ Unipolar: 10.24 V, 5.12 V;
● Current input:
○ Bipolar: ±51.2 mA, ±25.6 mA,
and ±12.8 mA
○ Unipolar: 51.2 mA, 25.6 mA;
Overvoltage protection up to ±20V;
Power
9.
Power Supply
9V to 33V
10.
Current consumption
40mA @ 12VDC, 20mA @ 24VDC

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5. Mounting and installation guide
a. IOMod 8AI RS485 interface
IOMod 8AI has integrated 120Ω termination resistor which can be enabled or disabled over USB
configuration. It is recommended to use termination at each end of the RS485 cable. See typical
connection diagram in Fig. 5.1.
Fig. 5.1. Typical IOMod connection diagram
IOMod 8AI has 1/8 Unit load receiver which allows having up to 255 units on a single line (compared
to standard 32 units). To reduce reflections keep the stubs (cable distance from main RS485 bus
line) as short as possible.

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b. IOMod 8AI inputs
A typical application of IOMod 8AI unipolar and bipolar voltage inputs is shown in Fig. 5.2. See
Configuration over USB chapter for instructions for analog input configuration.
Fig. 5.2. Voltage input connection diagram for IOMod device
All analog inputs can be configured as current inputs to connect 0-20 mA, 4-20 mA or other current
output sensors. Typical application of IOMod 8AI unipolar and bipolar current inputs is shown in Fig.

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5.3. See Configuration over USB chapter for instructions for analog input configuration.
Fig. 5.3. Current input connection diagram for IOMod device

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6. Configuration over USB
a. Driver installation
The device requires USB drivers to work as a Virtual COM port. The first-time connection between
device and computer could result in “Device driver software was not successfully installed” error (as
in Fig. 6.1).
Fig. 6.1. Unsuccessful device software installation error
A user then should manually install drivers by selecting a downloaded driver folder:
● Go to Control Panel -> Device Manager;
● Select a failing device;
● Press “Update driver software”; screen as in Fig. 6.2. should appear:
Fig. 6.2. Device driver software update message
● Select “x86” driver for a 32-bit machine or x64 for a 64-bit machine. If not sure, select a root
folder (folder in which x64 and x86 lay inside, as in Fig. 6.3).

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Fig. 6.3. Device driver folder content
b. IOMod configuration via PuTTY terminal
A configuration of IOMod device is done through CLI (Command Line Interface) on the virtual COM
port. Drivers needed for Microsoft Windows to install VCOM will be provided. To open up CLI simply
connect to specific V-COM port with terminal software (advised to use PuTTY terminal software. If
other software is being used, a user might need to send <return> symbol after each command).
When connected user should immediately see the main screen. For Modbus check Fig. 6.4, IEC-
60870-5-103 - Fig. 6.5.
Fig. 6.4. The main menu for IOMod 8AI, Modbus firmware version
Fig. 6.5. The main menu for IOMod 8AI, IEC-60870-5-103 version

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Navigation is performed by sending digits or other symbols to a terminal. A user then proceeds by
following on-screen instructions. For example, to set baud rate, press [2] to enter Communication
settings screen; press [1] to edit; enter new configuration; press [RETURN] to save, or [ESC] to
cancel changes. When done, press [0] (exit) before disconnecting device. Default values are set by
pressing [7] on the main screen, and confirming changes [1].
It is highly advised to exit the main screen before disconnecting device
If the terminal window is closed accidentally, a user can connect the terminal program again, and
press any key on a keyboard to show the main menu again.
Modbus Main menu
Name
Function
Values
Default
Values
[1]
Slave Address
Setting Modbus
Slave address
1-247
1
[2]
Communication
settings
[1] Baud rate,
[2] Data, Stop and
Parity Bits,
[3] RS485
Terminating resistor
[1] 100 - 256000,
[2] 8 Data bits + 1/2
Stop bits,
Even/None/Odd
Parity
[3] Enabled/Disabled
[1] 9600,
[2] 8N1,
[3] Enabled
[3]
Individual channel
configuration
Channel configuration screen (see Table “Individual Channel
Configuration”)
[7]
Set Default
Settings
Sets Default
Settings
(1 to confirm, 0 to
cancel)
-
[8]
Firmware
Upgrade
Mass Storage
Device Firmware
Upgrade
(1 to confirm, 0 to
cancel)
-
[9]
Diagnostics
Raw input values
-
-
[0]
Exit
Exit and disconnect
-
-
IEC-60870-5-103 Main Menu
Menu Name
Function
Values
Default
Values
[1]
Link Address
Changing link
address
1-247
1
[2]
Baud rate, Parity
and Stop bits
[1] Set 8 Data bits +
1 Stop bit
[3] 100-256000
[3] 9600
[4] None

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[2] Set 8 Data bits +
2 Stop bit
[3] Configure baud
rate
[4] Configure Parity
[4] None/ Odd /
Even / Mark/
Space
[3]
Data addressing
config
Enters configuring
screen for Input
address (function
type)
1 – 255
160
[4]
RS485 Terminating
Resistor
RS485 120 Ohm
Terminating Resistor
[1] Enable
[2] Disable
Enabled
[5]
Individual channel
configuration
Channel configuration screen (see Table “Individual Channel
Configuration”)
[7]
Set Default
Settings
Sets Default Settings
(1 to confirm, 0
to cancel)
-
[8]
Firmware Upgrade
Mass Storage Device
Firmware Upgrade
(1 to confirm, 0
to cancel)
-
[9]
Diagnostics
Raw input values
-
-
[0]
Exit
Exit and disconnect
-
-
Configuring an individual channel is a job requiring the most effort, therefore an additional table is
provided to make a configuration task much easier. Note that number written in brackets shows a
number for selection in an IEC-60870-5-103 version.
Individual Channel Configuration Menu
Menu
Name
Function
Values
Default
Values
[1]
Measure
Current/Voltag
e
Selecting this option
toggles measurement
selection
-
-
[2]
Change
sensitivity
Selecting a
measurement range
[1] [-10.24 V, 10.24
V],
[2] [-5.12 V, 5.12 V],
[3] [-2.56 V, 2.56 V],
[4] [0 V, 10.24 V],
[5] [0 V, 5.12 V]
[1] [-10.24 V,
10.24 V]
[3]
Measurement
limits
Entering floating point
values to use them for
marking
overflow/underflow
statuses
Floating values in a
range defined by
measuring sensitivity
-5 mV; 5mV

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[4]2
Cast to a
scaled
integer/float
Selecting this option
toggles value casting
selection
-
-
[5]1 2
Casting data
range
Check 3a. Common configuration information
[6]1
(4)
Live zero
tolerance
0.
Back
Back to last menu
screen
-
-
1 Only available if casting to a scaled integer is selected
2 Not available in IEC-60870-5-103 firmware version
c. Measurements’ calibration
Every device is shipped containing factory-predefined calibration coefficients. However, changing
temperature and humidity conditions can affect the accuracy of measurements. To get the best
accuracy, use the device at room temperature and if that is not possible, calibrate coefficients
accordingly.
To enter the calibration screen (Fig. 6.6) from main menu press ‘@’ symbol.
Fig. 6.6. Analog inputs’ calibration screen
In the calibration screen, either current or voltage coefficients can be selected. Selecting current by
pressing [1] should enter additional screen (Fig. 6.7). Calibrating voltage is an identical process therefore
only current setting is explained.
Fig. 6.7. Current calibration screen

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Fig. 6.8. Manual calibration coefficients’ setting
Fig.6.9. Automatic calibration coefficients’ setting
All configuration coefficients can either be configured all at once or individually. The coefficient
setting for all channels is done manually only. Tweaking individual channels, however, can be
automatic (Fig. 6.9) as well as manual (Fig. 6.8). Selecting automatic calibration polls values that
user inputs and tweaks coefficients to minimize the additive error. It is therefore advised to scan
several values differing by the same value interval to get the best results. Pressing ESC finishes
calibration and saves coefficients to non-volatile memory.
d. Protocol simulation over USB
After entering the diagnostics screen, protocol simulator can be turned on by pressing [9]. When it
is on, the device will communicate over USB port rather than a RS-485 line. Communication on a
RS-485 line is closed and all Modbus or IEC-60870-5-103 commands will only be accepted from
USB. To exit this mode device must be restarted.
e. Firmware upgrade over USB
To update device firmware user must:
● Enter the main configuration menu;
● Enter Firmware update screen by pressing [8];
● Confirm update by pressing [1];
The device should now enter Firmware Upgrade mode.

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It is recommended to close the terminal window after entering firmware upgrade
mode
The device should then reconnect as a mass storage device (Fig. 6.10).
Fig. 6.10. Mass storage device notification
Delete existing file “firmware.bin” and simply upload new firmware file by dragging and dropping as
in Fig. 6.11.
Fig. 6.11. Mass storage device for firmware upload
Reconnect device and check the firmware version. It should have changed.
The settings data structure may differ from version to version, therefore it is
highly advised to choose Default Settings after writing new firmware.
Otherwise, there is no guarantee that all device features are going to work
properly.

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7. Testing With “THE VINCI” software
To test IOMod with default settings, a device should be connected through RS485 to Modbus master.
Example using “The Vinci Expert” device as serial interface converter and adapter to PC with “The
Vinci” software. Default settings for Modbus – 9600 baud/s baud rate; 8 data, no parity, 1 stop bit.
When opening “The Vinci” software, choose Modbus serial – Master mode. In the Settings tab,
choose station number (default – 1); configure tags (as described in section Modbus operational
information); Press Start and go to “Statistic” tab as shown in Fig. 7.1.
Fig. 7.1. Testing IOMod Modbus communication using “THE VINCI” software
Fig. 7.2. Testing IEC-60870-5-103 communication using “THE VINCI” software
Default settings for IEC-60870-5-103 – 9600 baud/s baud rate; 8 data, no parity, 1 stop bit. After

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opening “The Vinci” software choose IEC-60870-5-103 serial – Master mode. In “Settings” tab,
choose station number (default – 1) and ASDU (default - 1); press “Start” and go to “Statistic” tab as
shown in Fig. 7.2.