Seneca Z-8NTC User Manual
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Seneca Z-8NTC User Manual

8-channel ntc temperature sensor converter with usb / rs485 port and modbus rtu protocol
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USER MANUAL
Z-8NTC
8-CHANNEL NTC TEMPERATURE SENSOR CONVERTER
WITH USB / RS485 PORT AND MODBUS RTU PROTOCOL
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

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  • Page 1 USER MANUAL Z-8NTC 8-CHANNEL NTC TEMPERATURE SENSOR CONVERTER WITH USB / RS485 PORT AND MODBUS RTU PROTOCOL 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 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.

  • Page 3: Table Of Contents

    User Manual Z-8NTC TABLE OF CONTENTS DEVICE DESCRIPTION AND INTENDED USE ............4 Description ....................................4 1.1. Features ....................................4 1.2. Technical specifications .................................5 1.3. DIP SWITCH CONFIGURATION .................. 6 Loading Modbus RTU configuration from flash ........................6 2.1. Setting the RS485 Port Modbus RTU Station Address ......................7 2.2.

  • Page 4: Device Description And Intended Use

    Linearization through configuration software for sensors: NTC, COSTER, KTY with Beta or Measure Points ▪ Easy power supply and serial bus wiring by means of the Seneca Z-BUS housed in the DIN rail. ▪ Removable screw terminals for 2.5 mm max section cable.

  • Page 5: Technical Specifications

    User Manual Z-8NTC Technical specifications 1.3. RS485 COMMUNICATION PORTS Number Protocol Modbus RTU Slave Baudrate From 1200 to 115200 configurable Parity, Data bit, Stop Bit Configurable from software USB COMMUNICATION PORTS Number Protocol Modbus RTU Slave Communication parameters Fixed at 38400, 8 bit, No parity, 1 stop bit www.seneca.it...

  • Page 6: Dip Switch Configuration

    User Manual Z-8NTC DIP SWITCH CONFIGURATION The Device can be fully configured with the Seneca free configuration tools: Easy Setup ▪ Z-NET4 ▪ The modbus RTU configuration on the RS485 port can be configured also by dip switch. WARNING! Dip switch configuration is active only after a reboot!

  • Page 7: Setting The Rs485 Port Modbus Rtu Station Address

    User Manual Z-8NTC Setting the RS485 Port Modbus RTU Station Address 2.2. Dip Switches 3..8 are used to configure the Modbus RTU Station Address: Modbus RTU DIP3 DIP4 DIP5 DIP6 DIP7 DIP8 Address …. Setting the RS485 Baud rate 2.3.

  • Page 8: Insert The Rs485 Terminator

    The Virtual Com driver is installed with the Easy Setup software. You can download the Easy Setup software from: https://www.seneca.it/en/linee-di-prodotto/software/easy/easy-setup MODBUS RTU PROTOCOL The Modbus protocol supported by the Z-8NTC is: Modbus RTU Slave ▪ For more information about these protocols, please refer to the Modbus specification website: http://www.modbus.org/specs.php.
  • Page 9 User Manual Z-8NTC WARNING! All 32 bit values are stored into 2 consecutive registers WARNING! You can read a maximum of 28 Modbus registers with the Read Holding Register function (function 3) WARNING! You can write a maximum of 28 Modbus registers with the Write Multiple Register function (function...

  • Page 10: Modbus Registers Table

    User Manual Z-8NTC MODBUS REGISTERS TABLE In the following table these abbreviations are used: MS = Most significant LS = Less significant MSW = Most significant Word (16 bits) LSW = Less significant Word (16 bits) R = Read only register...
  • Page 11 User Manual Z-8NTC Channel 1 Floating R/W* 40019 (MSW) 18-19 Coefficient Coefficient C for the Point 32 40020 (LSW) “C” Steinhart-Hart equation bits Channel 2 Floating R/W* 40021 (MSW) 20-21 Coefficient Coefficient A for the Point 32 40022 (LSW) “A”...
  • Page 12 User Manual Z-8NTC Channel 7 Floating R/W* 40051 (MSW) 50-51 Coefficient Coefficient A for the Point 32 40052 (LSW) “A” Steinhart-Hart equation bits Channel 7 Floating R/W* 40053 (MSW) 52-53 Coefficient Coefficient B for the Point 32 40054 (LSW) “B”...
  • Page 13 User Manual Z-8NTC 0 = 5 KOhm – 500 KOhm 1 = 1KOhm - 100 KOhm (*) 2 = 100 Ohm – 10 KOhm 3 = Channel disabled (*)= Note that out of these ranges, the 0.5% accuracy is not...
  • Page 14 User Manual Z-8NTC (*)= Note that out of these ranges, the 0.5% accuracy is not guaranteed Channel 7 Channel Range Unsigned R/W* 40069 Range Configuration 16 bits Configuration 0 = 5 KOhm – 500 KOhm 1 = 1KOhm - 100 KOhm (*) 2 = 100 Ohm –...
  • Page 15 User Manual Z-8NTC Measure Type Temperature (Kelvin) Bit 2 = 0 AND Bit 3 = 1 Measure Type Temperature (Celsius) Bit 2 = 1 AND Bit 3 = 1 Measure Type Temperature (Fahreneit) Bit 4 = 0 AND Bit 5 = 0...
  • Page 16 User Manual Z-8NTC Modbus RTU Modbus RTU Station Unsigned R/W* 40073 RS485 address 16 bits station Address CHANNEL 1 Measure channel in Floating 40075 (MSW) 74-75 FLOATING Floating Point in Point 32 40076 (LSW) POINT Ohm, K, °C or °F...
  • Page 17 User Manual Z-8NTC Bit 2 = 1 Channel 3 below the lower ADC limit Bit 3 = 1 Channel 4 below the lower ADC limit Bit 4 = 1 Channel 5 below the lower ADC limit Bit 5 = 1 Channel 6...
  • Page 18 User Manual Z-8NTC For example: 250 means 25.0°C CHANNEL 2 Measure channel in Signed 32 40094 (MSW) 93-94 INTEGER Integer format bits 40095 (LSW) MEASURE Ohm*10, K*10, °C*10 or °F*10 For example: 250 means 25.0°C CHANNEL 3 Measure channel in...
  • Page 19 User Manual Z-8NTC Ohm*10, K*10, °C*10 or °F*10 For example: 250 means 25.0°C www.seneca.it ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY Doc. MI004854-EN Rev. 1.0.2.1 Page 19 BE REPRODUCED WITHOUT PRIOR PERMISSION.

  • Page 20: Full Configuration With Easy Setup

    Z-8NTC FULL CONFIGURATION WITH EASY SETUP To configure all the device parameters you can use the USB or the RS485 Port and the Easy Z-8NTC Software included in the Easy Setup Suite. You can download the Easy Setup software free from: https://www.seneca.it/en/linee-di-prodotto/software/easy/easy-setup...

  • Page 21: Creating A Project Configuration

    User Manual Z-8NTC Creating a Project Configuration 6.2. WARNING! You must set all dip switches to OFF after sending the configuration to the device or the actual Modbus configuration will be overwritten with the dip switches configuration! The parameters that can be configured are:...
  • Page 22 User Manual Z-8NTC Channel TAB In the channel tab you can select the NTC parameters for each channel. Enable Channel / Resistance at 25°C: Select the resistance measurement range from the NTC value at 25°C, note that out of these ranges, the 0.5% accuracy is not guaranteed Steinhart-Hart Coefficients: Select the A, B and C coefficients for the NTC curve: = ��...

  • Page 23: Testing The Device

    User Manual Z-8NTC COSTER SAI010 COSTER SCB110-V-G-L-LI-LG ELIWELL SN8DAC13002AV GENERIC with Beta=3435K 10KOhm at 25°C KTY81 110 KTY81 120 KTY84 130 KTY84 150 SEMITECH 102AT-2 1KOhm at 25°C SEMITECH 103AT-2 10KOhm at 25°C SEMITECH 202AT-2 2KOhm at 25°C SEMITECH 502AT-2 5KOhm at 25°C the number of NTC/sensor files is growing steadily.

  • Page 24: The Datalogger

    User Manual Z-8NTC The datalogger 6.3.1. The datalogger can be used for acquire data that can be used with an external software (for example Microsoft Excel™). It is possible to set the sampling acquisition time (minimum 1 second). The datalogger will create a file in a standard .csv format that can be opened with external tools.

  • Page 25: Steinhart-Hart Coefficient Calculator

    User Manual Z-8NTC STEINHART-HART COEFFICIENT CALCULATOR The NTC sensor datasheets usually do not provide directly the Steinhart-Hart coefficients. The most used is the Beta value, other times, they provide a temperature / resistance table directly. The software can calculate automatically the Steinhart-Hart coefficients from both the Beta or Table.
  • Page 26 User Manual Z-8NTC If your sensor datasheet includes a Temperature/Resistance Table you can insert 3 pairs of values to obtain the Steinhart-Hart coefficients: Possibly select 3 points equally spaced in your measure range, for better precision insert also the value at 25°C.

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