Seneca Z-4RTD2-SI User manual

ORIGINAL INSTRUCTIONS
USER MANUAL
Z-4RTD2-SI
CONVERTER FOR THERMISTORS WITH 4 CHANNELS AND 24BIT ADC
SENECA S.r.l.
Via Austria 26 –35127 –Z.I. - PADOVA (PD) - ITALY
Tel. [phone] Fax [phone]
www.seneca.it

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The content of this documentation refers to products and technologies described in it.
All technical data contained in the document may be changed without notice.
The content of this documentation is subject to periodic review.
To use the product safely and effectively, read the following instructions carefully before use.
The product must be used only for the use for which it was designed and manufactured: any other use is under
the full responsibility of the user.
Installation, programming and set-up are allowed only to authorized, physically and intellectually suitable
operators.
Set-up must be performed only after correct installation and the user must follow all the operations described in
the installation manual carefully.
Seneca is not responsible for failures, breakages and accidents caused by ignorance or failure to apply the
stated requirements.
Seneca is not responsible for any unauthorized modifications.
Seneca reserves the right to modify the device, for any commercial or construction requirement, without the
obligation to promptly update the reference manuals.
No liability for the contents of this document can be accepted.
Use the concepts, examples and other content at your own risk.
There may be errors and inaccuracies in this document that could damage your system, so proceed with caution,
the author(s) will not take responsibility for it.
Technical specifications are subject to change without notice.
CONTACT US
Technical support
[email protected]
Product information
[email protected]
This document is the property of SENECA srl.
Copies and reproduction are prohibited unless authorised

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Document revisions
DATE
REVISION
NOTES
AUTHOR
22/06/2022
0
First revision
MM
10/10/2022
1
Added sampling rate
changes for fw 1010
revision.
Added info on float
swapped registers
Corrected errors in the
Modbus register list
MM

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TABLE OF CONTENTS
INTRODUCTION...........................................................................................................6
DESCRIPTION ..........................................................................................................6
COMMUNICATION PORT SPECIFICATIONS..........................................................6
TYPE OF SUPPORTED SENSORS.............................................................................7
RESPONSE MEASURES AND TIMES ........................................................................7
SAMPLING TIMES AND MEASUREMENT UPDATE TIME.....................................7
FILTER ......................................................................................................................8
MODBUS RESPONSE TIME.....................................................................................8
DEVICE CONFIGURATION..........................................................................................9
USB CONNECTION AND CONFIGURATION RESET.................................................9
FIRMWARE UPDATE.................................................................................................10
MODBUS COMMUNICATION PROTOCOL...............................................................11
SUPPORTED MODBUS FUNCTION CODES.........................................................11
MODBUS REGISTER TABLE....................................................................................12
NUMBERING OF "0-BASED" OR "1-BASED” MODBUS ADDRESSES ..............13
NUMBERING OF MODBUS ADDRESSES WITH "0-BASED" CONVENTION......13
NUMBERING OF MODBUS ADDRESSES WITH "1 BASED" CONVENTION
(STANDARD) ....................................................................................................................13
BIT CONVENTION WITHIN A MODBUS HOLDING REGISTER ...........................14

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MSB AND LSB BYTE CONVENTION WITHIN A MODBUS HOLDING REGISTER
15
REPRESENTATION OF A 32-BIT VALUE IN TWO CONSECUTIVE MODBUS
HOLDING REGISTERS.....................................................................................................15
TYPE OF 32-BIT FLOATING POINT DATA (IEEE 754).........................................16
Z-4RTD2-SI: MODBUS 4X HOLDING REGISTER TABLE (FUNCTION CODE 3) 17

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INTRODUCTION
ATTENTION!
This user manual extends the information from the installation manual to the configuration of the
device. Use the installation manual for more information.
ATTENTION!
In any case, SENECA s.r.l. or its suppliers will not be responsible for the loss of data/revenue or
consequential or incidental damages due to negligence or bad/improper management of the device,
even if SENECA is well aware of these possible damages.
SENECA, its subsidiaries, affiliates, group companies, suppliers and distributors do not guarantee that
the functions fully meet the customer's expectations or that the device, firmware and software should
have no errors or operate continuously.
DESCRIPTION
Z-4RTD2-SI is a converter for thermistors with four independent and isolated measurement channels equipped
with an analogue-digital converter with a 24-bit resolution.
The insulation relates to both the power supply and the RS485 communication port.
The device measures the value of the thermistors and makes them available through the RS485 port using the
Modbus RTU protocol.
COMMUNICATION PORT SPECIFICATIONS
RS485 COMMUNICATION PORTS
Number
1
Baudrate
From 2400 to 115200 bit/s configurable
Parity, Data bit, Stop bit
Configurable
Protocol
Modbus RTU Slave
USB COMMUNICATION PORT
Number
1
Protocol
Modbus RTU Slave
Use
For configuration with Easy-setup software and firmware update

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TYPE OF SUPPORTED SENSORS
The supported sensors are:
SENSOR
STANDARD
MEASURING
RANGE
PT100
EN 60751/A2 (ITS-90)
-200 ÷ +650°C
PT500
EN 60751/A2 (ITS-90)
-200 ÷ +750°C
PT1000
EN 60751/A2 (ITS-90)
-200 ÷ +210°C
NI100
DIN 43760
-60 ÷ +250°C
CU50
GOST 6651-2009
-180 ÷ +200°C
CU100
GOST 6651-2009
-180 ÷ +200°C
Ni120
DIN 43760
-60 ÷ +250°C
NI1000
DIN 43760
-60 ÷ +250°C
Each channel is independent, therefore it is also possible to use different sensors in the 4 channels.
RESPONSE MEASURES AND TIMES
SAMPLING TIMES AND MEASUREMENT UPDATE TIME
The sampling time is configurable from 25ms to 400ms per channel.
SAMPLING TIME PER
CHANNEL
25 ms
50 ms
100 ms
200 ms
400 ms
for example:
By activating 4 channels and setting a sampling time of 100ms on all, you get a measurement update every:
100*4 = 400 ms.
By activating 2 channels at 25 ms and 2 channels at 100 ms you get a measurement update every: 25*2 + 100*2
= 250 ms.

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ATTENTION!
In order not to lose the settings, NEVER update the firmware with a version older than the one installed
on the device.
FILTER
To each channel it is possible to insert a low pass filter to stabilize the measurement, it is a 10-sample moving
average filter.
MODBUS RESPONSE TIME
Modbus Response Time: 5 ms (typical)

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DEVICE CONFIGURATION
The device can be configured using the Easy Setup or Easy Setup 2 software, configurations are as follows:
SENSOR TYPE: allows you to select the type of sensor connected to the channel, it is also possible to
disconnect the channel if it is not used.
UNIT OF MEASUREMENT: allows you to set whether the measurement must be in °C or in Ohm
3-WIRE MEASUREMENT: Allows you to set whether the sensor measurement will be carried out with 3 or 4
wires (for the 2-wire connection, refer to the 4-wire connection)
CHANNEL SPEED: Allows you to set the channel sampling time
IF CHARGE FAILURE: Allows you to replace (or not) the measured value with a temperature/resistance safety
value set by the user in the event of a fault. The failure can be caused by:
1) Sensor beyond measurement values
2) Sensor breakage
ACTIVATE FILTER: Allows you to activate the filter on the selected channel, filtering allows you to obtain a
slower but stable measurement.
INTERPRETATION OF FLOATING POINTS: It allows you to set whether the single precision (32 bit) Floating
Point registers are to be interpreted with the most significant value on the high word or on the low word.
USB CONNECTION AND CONFIGURATION RESET
The front USB port allows a simple connection to configure the device via the configuration software.
If it is necessary to restore the instrument's initial configuration, use the configuration software.

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FIRMWARE UPDATE
Through the USB port it is possible to update the firmware.
To update the firmware:
1) Disconnect the device from the power supply;
2) Holding down the firmware update button (positioned as shown in the figure), reconnect the device to
the power supply
3) Now the instrument is in update mode, stop pressing the update key and connect the USB cable to the
PC
4) The device will be displayed in the PC as an "RP1-RP2” external unit
5) Copy the new firmware (uf2 extension) to the root of the "RP1-RP2” unit

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6) Once the firmware file has been copied, the device will automatically reboot and be ready for use.
7) Verify that the fw update was successful by connecting the device to the Easy Setup software, the
firmware revision (in this case 1002) is shown in the bottom left:
MODBUS COMMUNICATION PROTOCOL
The supported communication protocol is:
▪Modbus RTU Slave (from both the RS485 and USB ports)
For more information on these protocols, see the website:
http://www.modbus.org/specs.php.
SUPPORTED MODBUS FUNCTION CODES
The following Modbus functions are supported:
▪Read Holding Register (function 3)
▪Write Single Register (function 6)
▪Write Multiple registers (function 16)
ATTENTION!
All 32-bit values are contained in 2 consecutive registers
ATTENTION!
All 64-bit values are contained in 4 consecutive registers
ATTENTION!
Any registers with RW* (in flash memory) can be written up to about 10000 times
The programmer must make sure the PLC/Master Modbus does not exceed this limit

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MODBUS REGISTER TABLE
The following abbreviations are used in the register tables:
MS
Most Significant
LS
Least Significant
MSBIT
Most Significant Bit
LSBIT
Least Significant Bit
MMSW
“Most” Most Significant Word (16bit)
MSW
Most Significant Word (16bit)
LSW
Least Significant Word (16bit)
LLSW
“Least” Least Significant Word (16bit)
RO
Read Only
RW*
Read-Write: REGISTERS CONTAINED IN FLASH MEMORY: WRITABLE ABOUT
10,000 TIMES MAXIMUM
RW**
Read-Write: REGISTERS THAT CAN BE WRITTEN ONLY AFTER WRITING THE
COMMAND "ENABLE WRITE CUSTOM ENERGIES = 49616"
UNSIGNED 16 BIT
Unsigned integer register that can assume values from 0 to 65535
SIGNED 16 BIT
Signed integer register that can take values from -32768 to +32767
UNSIGNED 32 BIT
Unsigned integer register that can assume values from 0 to 4294967296
SIGNED 32 BIT
Signed integer register that can take values from -2147483648 to 2147483647
UNSIGNED 64 BIT
Unsigned integer register that can assume values from 0 to 18446744073709551615
SIGNED 64 BIT
Signed integer register that can assume values from -2^63 to 2^63-1
FLOAT 32 BIT
32-bit, single-precision floating-point register (IEEE 754)
https://en.wikipedia.org/wiki/IEEE_754
BIT
Boolean register, which can take the values 0 (false) or 1 (true)

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NUMBERING OF "0-BASED" OR "1-BASED” MODBUS ADDRESSES
According to the Modbus standard the Holding 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.
ATTENTION!
CAREFULLY READ THE DOCUMENTATION OF THE MODBUS MASTER DEVICE IN ORDER TO
UNDERSTAND WHICH OF THE TWO CONVENTIONS THE MANUFACTURER HAS DECIDED TO USE
NUMBERING OF MODBUS ADDRESSES WITH "0-BASED" CONVENTION
The numbering is:
HOLDING REGISTER MODBUS
ADDRESS (OFFSET)
MEANING
0
FIRST REGISTER
1
SECOND REGISTER
2
THIRD REGISTER
3
FOURTH REGISTER
4
FIFTH REGISTER
Therefore, the first register is at address 0.
In the following tables, this convention is indicated with “ADDRESS OFFSET”.
NUMBERING OF MODBUS ADDRESSES WITH "1 BASED" CONVENTION (STANDARD)
The numbering is that established by the Modbus consortium and is of the type:
HOLDING REGISTER MODBUS
ADDRESS 4x
MEANING
40001
FIRST REGISTER
40002
SECOND REGISTER
40003
THIRD REGISTER
40004
FOURTH REGISTER
40005
FIFTH REGISTER
In the following tables this convention is indicated with “ADDRESS 4x” since a 4 is added to the address so
that the first Modbus register is 40001.

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A further convention is also possible where the number 4 is omitted in front of the register address:
HOLDING MODBUS ADDRESS
WITHOUT 4x
MEANING
1
FIRST REGISTER
2
SECOND REGISTER
3
THIRD REGISTER
4
FOURTH REGISTER
5
FIFTH REGISTER
BIT CONVENTION WITHIN A MODBUS HOLDING REGISTER
A Modbus Holding Register consists of 16 bits with the following convention:
BIT
15
BIT
14
BIT
13
BIT
12
BIT
11
BIT
10
BIT
9
BIT
8
BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
BIT
2
BIT
1
BIT
0
For instance, if the value of the register in decimal is
12300
the value 12300 in hexadecimal is:
0x300C
the hexadecimal 0x300C in binary value is:
11 0000 0000 1100
So, using the above convention, we get:
BIT
15
BIT
14
BIT
13
BIT
12
BIT
11
BIT
10
BIT
9
BIT
8
BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
BIT
2
BIT
1
BIT
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
0
0

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MSB and LSB BYTE CONVENTION WITHIN A MODBUS HOLDING REGISTER
A Modbus Holding Register consists of 16 bits with the following convention:
BIT
15
BIT
14
BIT
13
BIT
12
BIT
11
BIT
10
BIT
9
BIT
8
BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
BIT
2
BIT
1
BIT
0
LSB Byte (Least Significant Byte) defines the 8 bits ranging from Bit 0 to Bit 7 included, we define MSB Byte
(Most Significant Byte) the 8 bits ranging from Bit 8 to Bit 15 inclusive:
BIT
15
BIT
14
BIT
13
BIT
12
BIT
11
BIT
10
BIT
9
BIT
8
BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
BIT
2
BIT
1
BIT
0
BYTE MSB
BYTE LSB
REPRESENTATION OF A 32-BIT VALUE IN TWO CONSECUTIVE MODBUS HOLDING
REGISTERS
The representation of a 32-bit value in the Modbus Holding Registers is made using 2 consecutive Holding
Registers (a Holding Register is a 16-bit register). To obtain the 32-bit value it is therefore necessary to read two
consecutive registers:
For example, if register 40064 contains the 16 most significant bits (MSW) while register 40065 contains the
least significant 16 bits (LSW), the 32-bit value is obtained by composing the 2 registers:
BIT
15
BIT
14
BIT
13
BIT
12
BIT
11
BIT
10
BIT
9
BIT
8
BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
BIT
2
BIT
1
BIT
0
40064 MOST SIGNIFICANT WORD
BIT
15
BIT
14
BIT
13
BIT
12
BIT
11
BIT
10
BIT
9
BIT
8
BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
BIT
2
BIT
1
BIT
0
40065 LEAST SIGNIFICANT WORD
    󰇛 󰇜
In the reading registers it is possible to swap the most significant word with the least significant word, therefore
it is possible to obtain 40064 as LSW and 40065 as MSW.

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TYPE OF 32-BIT FLOATING POINT DATA (IEEE 754)
The IEEE 754 standard (https://en.wikipedia.org/wiki/IEEE_754) defines the format for representing floating
point numbers.
As already mentioned, since it is a 32-bit data type, its representation occupies two 16-bit holding registers.
To obtain a binary/hexadecimal conversion of a floating point value it is possible to refer to an online converter
at this address:
http://www.h-schmidt.net/FloatConverter/IEEE754.html
Using the last representation the value 2.54 is represented at 32 bits as:
0x40228F5C
Since we have 16-bit registers available, the value must be divided into MSW and LSW:
0x4022 (16418 decimal) are the 16 most significant bits (MSW) while 0x8F5C (36700 decimal) are the 16 least
significant bits (LSW).

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Z-4RTD2-SI: MODBUS 4X HOLDING REGISTER TABLE (FUNCTION CODE 3)
ADDRESS
(4x)
OFFSET
REGISTER
ORDER
CHANNEL
DESCRIPTION
R/
W
TYPE
40001
0
MACHINE
IDENTIFICATION
-
-
Identification code
RO
UNSIGNED
16 BIT
40002
1
ERRORS
-
-
Bit[15]
1 = IN1 MEASURE
OUT OF RANGE
0 = IN1 MEASURE OK
Bit[14]
1 = IN2 MEASURE
OUT OF RANGE
0 = IN2 MEASURE OK
Bit[13]
1 = IN3 MEASURE
OUT OF RANGE
0 = IN3 MEASURE OK
Bit[12]
1 = IN4 MEASURE
OUT OF RANGE
0 = IN4 MEASURE OK
Bit[11]
1 = IN1 BURNOUT
0 = IN1 OK
Bit[10]
1 = IN2 BURNOUT
0 = IN2 OK
Bit[9]
1 = IN3 BURNOUT
0 = IN3 OK
Bit[8]
1 = IN4 BURNOUT
0 = IN4 OK
Bit[7..0]
NOT USED
RO
UNSIGNED
16 BIT
40003
2
16 bit MEASURE
-
1
If Measure Type =
"°C" unit measure is
[°C/10]
For example 2000 ->
200.0° C
If Measure Type =
"Ohm" unit measure
is:
for
PT100/NI100/NI120/
CU50/CU100
[Ohm/100] (example
RO
SIGNED 16
BIT

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ADDRESS
(4x)
OFFSET
REGISTER
ORDER
CHANNEL
DESCRIPTION
R/
W
TYPE
20000 -> 200.00
Ohm)
for
PT1000/PT500/NI100
0 [Ohm/10] (example
2000 -> 200.0 Ohm)
40004
3
16 bit MEASURE
-
2
If Measure Type =
"°C" unit measure is
[°C/10]
For example 2000 ->
200.0° C
If Measure Type =
"Ohm" unit measure
is:
for
PT100/NI100/NI120/
CU50/CU100
[Ohm/100] (example
20000 -> 200.00
Ohm)
for
PT1000/PT500/NI100
0 [Ohm/10] (example
2000 -> 200.0 Ohm)
RO
SIGNED 16
BIT
40005
4
16 bit MEASURE
-
3
If Measure Type =
"°C" unit measure is
[°C/10]
For example 2000 ->
200.0° C
If Measure Type =
"Ohm" unit measure
is:
for
PT100/NI100/NI120/
CU50/CU100
[Ohm/100] (example
20000 -> 200.00
Ohm)
for
PT1000/PT500/NI100
0 [Ohm/10] (example
2000 -> 200.0 Ohm)
RO
SIGNED 16
BIT

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ADDRESS
(4x)
OFFSET
REGISTER
ORDER
CHANNEL
DESCRIPTION
R/
W
TYPE
40006
5
16 bit MEASURE
-
4
If Measure Type =
"°C" unit measure is
[°C/10]
For example 2000 ->
200.0° C
If Measure Type =
"Ohm" unit measure
is:
for
PT100/NI100/NI120/
CU50/CU100
[Ohm/100] (example
20000 -> 200.00
Ohm)
for
PT1000/PT500/NI100
0 [Ohm/10] (example
2000 -> 200.0 Ohm)
RO
SIGNED 16
BIT
40007
6
FLOAT MEASURE
MSW
1
Measure [°C] or
[Ohm]
RO
FLOAT 32
40008
7
LSW
40009
8
FLOAT MEASURE
MSW
2
Measure [°C] or
[Ohm]
RO
FLOAT 32
40010
9
LSW
40011
10
FLOAT MEASURE
MSW
3
Measure [°C] or
[Ohm]
RO
FLOAT 32
40012
11
LSW
40013
12
FLOAT MEASURE
MSW
4
Measure [°C] or
[Ohm]
RO
FLOAT 32
40014
13
LSW
40015
14
REVISION
FIRMWARE
-
-
Firmware Revision
RO
UNSIGNED
16 BIT
40016
15
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40017
16
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40018
17
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40019
18
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40020
19
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40021
20
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40022
21
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40023
22
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT

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ADDRESS
(4x)
OFFSET
REGISTER
ORDER
CHANNEL
DESCRIPTION
R/
W
TYPE
40024
23
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40025
24
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40026
25
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40027
26
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40028
27
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40029
28
COMMAND
REGISTER
-
-
Register for
command execution
(decimal):
REBOOT=52428
SAVE
CONFIGURATION =
51792
SAVE AND REBOOT =
49568
RO
UNSIGNED
16 BIT
40030
29
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40031
30
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40032
31
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40033
32
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40034
33
NOT USED
-
-
Not used
RO
UNSIGNED
16 BIT
40035
34
RS485
ADDRESS_PARITY
-
-
Bit[15:8]
RS485 Modbus
Station Address
[1..255]
Bit[7:0]
RS485 Parity : 0=no,
1=even, 2=odd
RW
UNSIGNED
16 BIT
40036
35
RS485 BAUDRATE
-
-
Bit[15:8] Baudrate:
0=4800 1=9600
2=19200 3=38400
4=57600 5=115200
6=1200 7=2400
RW
UNSIGNED
16 BIT