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Summary of Contents for Seneca Z-4RTD2-SI
- Page 1 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. +39.049.8705355 – 8705355 Fax +39 049.8706287 www.seneca.it ORIGINAL INSTRUCTIONS...
- Page 2 SENECA's liability in relation to its products is governed by the general conditions of sale, which can be downloaded from www.seneca.it. Neither SENECA nor its employees, within the limits of applicable law, will in any case be liable for any lost profits and/or sales, loss of data and/or information, higher costs incurred for goods and/or replacement services,...
- Page 3 User Manual Z-4RTD2-SI Document revisions DATE REVISION NOTES AUTHOR 22/06/2022 First revision Added sampling rate changes for fw 1010 revision. 10/10/2022 Added info on float swapped registers Corrected errors in the Modbus register list Added information on USB port Added information on...
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Page 4: Table Of Contents
USB CONNECTION AND CONFIGURATION RESET..........9 FIRMWARE UPDATE....................10 HARDWARE REVISION ..................10 Z-4RTD2-SI HARDWARE REVISION “A” MODEL ..........10 Z-4RTD2-SI HW REVISION “B” MODEL REVISION “B” MODEL AND FOLLOWING ........................11 MODBUS COMMUNICATION PROTOCOL ............13 SUPPORTED MODBUS FUNCTION CODES ............13 MODBUS REGISTER TABLE ................. - Page 5 REPRESENTATION OF A 32-BIT VALUE IN TWO CONSECUTIVE MODBUS HOLDING REGISTERS ..................... 17 TYPE OF 32-BIT FLOATING POINT DATA (IEEE 754) ......... 18 Z-4RTD2-SI: MODBUS 4X HOLDING REGISTER TABLE (FUNCTION CODE 3) 19 ALL RIGHTS RESERVED. NO PART OF THIS www.seneca.it...
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Page 6: Description
Z-4RTD2-SI DESCRIPTION DESCRIPTION Z-4RTD2-SI is a converter for thermistors with four independent and isolated measurement channels equipped with an analog-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. -
Page 7: Type Of Supported Sensors
User Manual Z-4RTD2-SI 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... -
Page 8: Response Measures And Times
User Manual Z-4RTD2-SI 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 25ms 50ms 100ms 200ms 400ms 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. -
Page 9: Device Configuration
User Manual Z-4RTD2-SI 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. -
Page 10: Firmware Update
It is possible to know the hardware revision of a device via the paper label printed on the side of the device. The label is: The hardware revision can be found in the top right (in the example this is product Z-4RTD2-SI hardware revision ‘B’) Z-4RTD2-SI HARDWARE REVISION “A”... -
Page 11: Following
(in this case 1002) is shown in the bottom left: Z-4RTD2-SI HW REVISION “B” MODEL REVISION “B” MODEL AND FOLLOWING In this hardware revision, the firmware update is done by moving dip switch 9 to the ‘ON’ position: To update the firmware: 1) Disconnect the device from the power supply;... - Page 12 User Manual Z-4RTD2-SI 6) Copy the new firmware (uf2 extension) to the root of the “RP1-RP2” unit Once the firmware file has been copied, the device will automatically reboot 7) Remove power from the device 8) Turn dip switch 9 to OFF, the device is now in “normal operation” mode.
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Page 13: Modbus Communication Protocol
User Manual Z-4RTD2-SI 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:... -
Page 14: Modbus Register Table
User Manual Z-4RTD2-SI MODBUS REGISTER TABLE The following abbreviations are used in the register tables: Most Significant Least Significant MSBIT Most Significant Bit LSBIT Least Significant Bit MMSW “Most” Most Significant Word (16bit) Most Significant Word (16bit) Least Significant Word (16bit) LLSW “Least”... -
Page 15: 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"... -
Page 16: Bit Convention Within A Modbus Holding Register
User Manual Z-4RTD2-SI A further convention is also possible where the number 4 is omitted in front of the register address: HOLDING MODBUS ADDRESS MEANING WITHOUT 4x FIRST REGISTER SECOND REGISTER THIRD REGISTER FOURTH REGISTER FIFTH REGISTER BIT CONVENTION WITHIN A MODBUS HOLDING REGISTER... -
Page 17: Msb And Lsb Byte Convention Within A Modbus Holding Register
User Manual Z-4RTD2-SI MSB and LSB BYTE CONVENTION WITHIN A MODBUS HOLDING REGISTER A Modbus Holding Register consists of 16 bits with the following convention: LSB Byte (Least Significant Byte) defines the 8 bits ranging from Bit 0 to Bit 7 included, we define MSB Byte... -
Page 18: Type Of 32-Bit Floating Point Data (Ieee 754)
User Manual Z-4RTD2-SI 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. -
Page 19: Z-4Rtd2-Si: Modbus 4X Holding Register Table (Function Code 3)
User Manual Z-4RTD2-SI Z-4RTD2-SI: MODBUS 4X HOLDING REGISTER TABLE (FUNCTION CODE 3) ADDRESS OFFSET REGISTER ORDER CHANNEL DESCRIPTION TYPE (4x) MACHINE UNSIGNED 40001 Identification code IDENTIFICATION 16 BIT Bit[15] 1 = IN1 MEASURE OUT OF RANGE 0 = IN1 MEASURE OK... - Page 20 User Manual Z-4RTD2-SI ADDRESS OFFSET REGISTER ORDER CHANNEL DESCRIPTION TYPE (4x) 20000 -> 200.00 Ohm) PT1000/PT500/NI100 0 [Ohm/10] (example 2000 -> 200.0 Ohm) If Measure Type = "°C" unit measure is [°C/10] For example 2000 -> 200.0° C If Measure Type = "Ohm"...
- Page 21 User Manual Z-4RTD2-SI ADDRESS OFFSET REGISTER ORDER CHANNEL DESCRIPTION TYPE (4x) If Measure Type = "°C" unit measure is [°C/10] For example 2000 -> 200.0° C If Measure Type = "Ohm" unit measure SIGNED 16 40006 16 bit MEASURE PT100/NI100/NI120/...
- Page 22 User Manual Z-4RTD2-SI ADDRESS OFFSET REGISTER ORDER CHANNEL DESCRIPTION TYPE (4x) Bit[15..12] Not Used Bit[11:9] Filter: 0=not active 1=active Bit[8:6] RTD TYPE 0= PT100 1= NI100 2= PT500 3= PT1000 4= CU50 5= CU100 6= NI120 7= NI1000. INPUT UNSIGNED...
- Page 23 User Manual Z-4RTD2-SI ADDRESS OFFSET REGISTER ORDER CHANNEL DESCRIPTION TYPE (4x) Bit[15..12] Not Used Bit[11:9] Filter: 0=not active 1=active Bit[8:6] RTD TYPE 0= PT100 1= NI100 2= PT500 3= PT1000 4= CU50 5= CU100 6= NI120 7= NI1000. INPUT UNSIGNED...
- Page 24 User Manual Z-4RTD2-SI ADDRESS OFFSET REGISTER ORDER CHANNEL DESCRIPTION TYPE (4x) Bit[15] Floating Point Representation 0= MSW FIRST 1= LSW FIRST Bit[14..4] NOT USED Bit[3] IN1 FAULT BEHAVIOUR 1 = LOAD FAIL VALUE 0 = KEEP LAST VALUE Bit[2] IN2 FAULT...
- Page 25 User Manual Z-4RTD2-SI ADDRESS OFFSET REGISTER ORDER CHANNEL DESCRIPTION TYPE (4x) SAVE CONFIGURATION = 51792 SAVE AND REBOOT = 49568 Offset for the 40133 OFFSET [°C / Ohm] measure channel FLOAT 32 40134 [°C/Ohm] Offset for the 40135 OFFSET [°C / Ohm]...
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