Seneca T201DCH50-MU User manual

ORIGINAL INSTRUCTIONS
USER MANUAL
T201DCH50-MU
T201DCH100-MU
T201DCH300-MU
AC/DC TRUE RMS or DC BIPOLAR CURRENT TRANSFORMER
WITH MODBUS RTU PROTOCOL AND ANALOG/DIGITAL OUTPUT
SENECA S.r.l.
Via Austria 26 –35127 –Z.I. - PADOVA (PD) - ITALY
Tel. [phone] Fax [phone]
www.seneca.it

User Manual
T201DCH50/100/300-MU
ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY
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www.seneca.it
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Introduction
Contents of the present documentation refer to products and technologies described in it.
All technical data contained in the document may be modified without prior notice.
Content of this documentation is subject to periodical revision.
To use the product safely and effectively, read carefully the following instructions before use.
The product must be used only for the use for which it was designed and built: any other use must be
considered with full responsibility of the user.
The installation, programming and set-up is allowed only to authorized operators, physically and intellectually
suitable.
Set up shall be performed only after a correct installation and the user shall perform every operation described
in the installation manual carefully.
Seneca is not considered liable for failure, breakdown, accident caused because of ignorance or failure to
apply the indicated requirements.
Seneca is not considered liable for any unauthorized changes.
Seneca reserves the right to modify the device, for any commercial or construction requirements, without the
obligation to promptly update the reference manuals.
No liability for the contents of this documents can be accepted.
Use the concepts, examples and other content at your own risk.
There may be errors and inaccuracies in this document that may of course be damaging to your system.
Proceed with caution, and although this is highly unlikely, the author(s) do not take any responsibility for that.
Technical features subject to change without notice.
CONTACT US
Technical support
[email protected]
Product information
[email protected]
Document revisions
DATE
REVISION
NOTES
20/02/2019
1.0.0.0
First Revision
This document is property of SENECA srl. Duplication and reproduction are forbidden, if not authorized.

User Manual
T201DCH50/100/300-MU
ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY
BE REPRODUCED WITHOUT PRIOR PERMISSION.
www.seneca.it
Doc. MI00546-EN
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TABLE OF CONTENTS
DEVICE DESCRIPTION AND INTENDED USE...........................................................4
1.1. Description ..............................................................................................................................................................................4
1.2. Features ...................................................................................................................................................................................4
CONFIGURING THE DEVICE ......................................................................................5
DIP SWITCH CONFIGURATION..................................................................................6
3.1. Loading configuration from flash..........................................................................................................................................6
3.2. Setting the RS485 Modbus RTU Station Address................................................................................................................6
3.3. Setting the RS485 Baud rate ..................................................................................................................................................7
3.4. Setting the RMS/Bipolar mode and 50% - 100% full scale ..................................................................................................7
MODBUS RTU PROTOCOL.........................................................................................9
4.1. Modbus RTU function code supported.................................................................................................................................9
MODBUS REGISTER TABLE....................................................................................10
5.1. "0-BASED" OR "1-BASED” MODBUS ADDRESSES ..........................................................................................................10
5.1.1. MODBUS ADDRESSES WITH "0-BASED" CONVENTION..........................................................................................12
5.1.2. MODBUS ADDRESSES WITH "1 BASED" CONVENTION (STANDARD)...................................................................12
5.2. BIT CONVENTION WITHIN A MODBUS HOLDING REGISTER ..........................................................................................13
5.3. MSB and LSB BYTE CONVENTION WITHIN A MODBUS HOLDING REGISTER..............................................................13
5.4. REPRESENTATION OF A 32-BIT VALUE IN TWO CONSECUTIVE MODBUS HOLDING REGISTERS ...........................13
5.5. TYPE OF 32-BIT FLOATING POINT DATA (IEEE 754) ........................................................................................................14
5.6. T201DCH-MU: MODBUS 4xxxx HOLDING REGISTERS TABLE (FUNCTION CODE 3)....................................................15
FULL CONFIGURATION WITH EASY SETUP..........................................................19
6.1. Easy Setup Menu ..................................................................................................................................................................19
6.2. Creating a Project Configuration.........................................................................................................................................20
6.3. Testing the Device ................................................................................................................................................................23
6.3.1. The datalogger ..............................................................................................................................................................24

User Manual
T201DCH50/100/300-MU
ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY
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Doc. MI00546-EN
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DEVICE DESCRIPTION AND INTENDED USE
WARNING!
This User Manual extend the information from the Installation Manual about the device configuration.
Use the Installation Manual for more info.
WARNING!
Under any circumstances, SENECA s.r.l. or its suppliers shall not be responsible for loss of recording
data/incomes or for consequential or incidental damage due to neglect or reckless mishandling of the
device, even though SENECA is well aware of these possible damages.
SENECA, its subsidiaries, affiliates, companies of the group, its suppliers and retailers shall not
guarantee that the functions will satisfy completely customer’s expectations or that device, the
firmware and the software shall have no errors or work continuously.
1.1. Description
The T201DCH50/100/300-MU are isolated, contact less loop powered AC/DC current transducers. The look
and device’s function are very similar to those of an active standard Current Transformer, but with the
remarkable feature of measuring the DC and AC component. For its electrical endurance, ease of use and
compact dimensions, the T201DCH50-MU, T201DCH100-MU and T201DCH300-MU fit every kind of current
measurement: up to 50 Adc/Aac, 100 Adc/Aac and 300 Adc/Aac (respectively).
A RS485 port and an USB port with a standard Modus RTU slave protocol are also available.
The device can measure a current in 2 different modes (using dip switches or the Easy Setup Software):
TRUE RMS AC/DC CURRENT MEASURE
DC BIPOLAR CURRENT MEASURE (used also for obtain the sign +/- of a DC current)
1.2. Features
Similar usage to a standard alternating current active C.T.
No shunt, no wasted power from the measure circuit
High accuracy rating
Analog 0/10V dc with configurable start/stop values
Digital Output configurable Alarm (Max, Min, Window)
Suitable for use with all Seneca modules that allow to power the device with at least 12 Vdc and having a
0 –10Vdc input
Simple configurable with dip switches or with the free Easy Setup software
Two ranges, dip-switch selectable

User Manual
T201DCH50/100/300-MU
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Damping filter availability to improve stable reading
Modbus RTU protocol by RS485 and USB ports
Modbus Address/Baud Rate/Range/Mode configurable also from dip switch
Suitable for batteries, battery chargers, solar panels, power units and generic dc and ac loads.
Compact size: overall dimensions less than 96,5 x 68 x 26 mm
Baud rate for Modbus RTU: from 1200 baud up to 115200 baud
Start/Stop Input/Output Alarm Values configurable with Easy Setup software
I Max/Min Resettable by Modbus RTU registers
Quick installation on DIN 46277 rail
Refer to the installation manual for more information.
CONFIGURING THE DEVICE
The Device can be configured in two ways:
A basic configuration from dip switches
A full configuration from flash (using Easy Setup Software by the USB port)
WARNING!
Dip switches configuration are active only after a reboot!
WARNING!
The Dip Switch setting will overwrite the Flash setting so, if you need to use the flash configuration
you MUST set ALL dip switches to “OFF”.

User Manual
T201DCH50/100/300-MU
ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY
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Doc. MI00546-EN
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DIP SWITCH CONFIGURATION
3.1. Loading configuration from flash
If ALL Dip Switch 1…8 are OFF, the device use the Flash configuration (you must use the Easy Setup
Software for configure)
Load
Configuration
DIP1
DIP2
DIP3
DIP4
DIP5
DIP6
DIP7
DIP8
FROM FLASH
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
3.2. Setting the RS485 Modbus RTU Station Address
Dip Switch 1..4 are using for configure the Modbus RTU Station Address:
Modbus RTU
Address
DIP1
DIP2
DIP3
DIP4
1
ON
OFF
OFF
OFF
2
OFF
ON
OFF
OFF
3
ON
ON
OFF
OFF
4
OFF
OFF
ON
OFF
5
ON
OFF
ON
OFF
6
OFF
ON
ON
OFF
7
ON
ON
ON
OFF
8
OFF
OFF
OFF
ON
9
ON
OFF
OFF
ON
10
OFF
ON
OFF
ON
11
ON
ON
OFF
ON
12
OFF
OFF
ON
ON
13
ON
OFF
ON
ON
14
OFF
ON
ON
ON
15
ON
ON
ON
ON

User Manual
T201DCH50/100/300-MU
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3.3. Setting the RS485 Baud rate
Dip Switch 5..6 are used for setting the Baud Rate
Baud Rate
DIP5
DIP6
9600
OFF
OFF
19200
ON
OFF
38400
OFF
ON
57600
ON
ON
WARNING!
The Parity bit can not be configured with the dip switches configuration but only from the Easy Setup
software. By setting the dip switches the parity is always set to “None” (8,N,1).
3.4. Setting the RMS/Bipolar mode and 50% - 100% full scale
Dip Switch 7: Select from True RMS Measure / Bipolar DC Measure
Dip Switch 8: Select 50% of full scale
The following figure is related to RMS measure (“Bipol”dip switch 7 = OFF):

User Manual
T201DCH50/100/300-MU
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Doc. MI00546-EN
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MODEL
DIP7
BIPOL
DIP8
50% FS
A
B
T201DCH50-MU
OFF
OFF
25 A
50 A
T201DCH50-MU
OFF
ON
12,5 A
25 A
T201DCH100-MU
OFF
OFF
50 A
100 A
T201DCH100-MU
OFF
ON
25 A
50 A
T201DCH300-MU
OFF
OFF
150 A
300 A
T201DCH300-MU
OFF
ON
75 A
150 A
The following figure is related to Bipolar measure (“Bipol”dip switch 7 = ON):
MODEL
BIPOL DIP7
SWITCH
50%FS DIP8
SWITCH
C
D
T201DCH50-MU
ON
OFF
-50 A
+50 A
T201DCH50-MU
ON
ON
-25 A
+25 A
T201DCH100-MU
ON
OFF
-100 A
+100 A
T201DCH100-MU
ON
ON
-50 A
+50 A
T201DCH300-MU
ON
OFF
-300 A
+300 A
T201DCH300-MU
ON
ON
-150 A
+150 A

User Manual
T201DCH50/100/300-MU
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WARNING!
Dip switches configuration is active only after a reboot!
So, for example using the RMS measure with 0 A input the Output voltage is 0V but using the Bipolar measure
with 0 A input the Output voltage is 5V.
MODBUS RTU PROTOCOL
The Modbus protocol supported by the T201DCH50-100-300-MU is:
Modbus RTU Slave
For more information about these protocols, please refer to the Modbus specification website:
http://www.modbus.org/specs.php.
4.1. Modbus RTU function code supported
The following Modbus RTU functions are supported:
Read Holding Register (function 3) Max 5 Registers
Write Single Register (function 6)
Write Multiple registers (function 16) Max 2 Registers
WARNING!
All 32 bits values are stored into 2 consecutive registers
WARNING!
You can Read a Maximum of 5 Modbus Registers with the Read Holding Register function (function 3)

User Manual
T201DCH50/100/300-MU
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WARNING!
You can Write a Maximum of 2 Modbus Registers with the Write Multiple Register function (function
16)
WARNING!
The USB Modbus configuration is fixed to 38400 baud, 8bit , No parity, 1 stop bit
When the USB cable is inserted the RS485 will stop to communicate until the USB will be unplugged.
MODBUS REGISTER TABLE
The following abbreviations are used in the register tables:
MS = More significant
LS = Less significant
MSW = 16 most significant bits
LSW = 16 least significant bits
MSW* = 16 most significant or least significant bits depending on the configuration (most significant default)
LSW* = 16 less significant or more significant bits depending on the configuration (less significant default)
MSW = 8 most significant bits
LSW = 8 least significant bits
MSBIT = Most significant bit
MSBIT = Least significant bit
RO = Register in read-only
RW = Read/write register
RW** = Reading and writing register contained in flash memory, writable a maximum of 10000 times.
Unsigned 16 bit = unsigned integer register, can take values from 0 to 65535
Signed 16 bit = signed integer register can take values from -32768 to +32767
Float 32 bits = 32-bit single-precision floating point register (IEEE 754) https://en.wikipedia.org/wiki/IEEE_754
BIT = Boolean registry, can be 0 (false) or 1 (true)
5.1. "0-BASED" OR "1-BASED” MODBUS ADDRESSES
According to the Modbus standard the Holding Register registers are addressable from 0 to 65535, there are 2
different conventions for numbering the addresses: "0-BASED" and "1-BASED".
For greater clarity, Seneca shows its register tables in both conventions.