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This document provides functional description, installation, configuration and operating
instructions for ELGAS EDT 101 temperature transducer with Modbus protocol. The
information in this document covers software revision 3.11.

Information in this document is subject to change without notice and does not represent a
commitment on the part of ELGAS, s.r.o. Improvements and/or changes in this manual or the
product may be made at any time. These changes will be made periodically to correct technical
inaccuracies or typographical errors.

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Summary of Contents for EDT 101

Page 1: ...1 Temperature transducer EDT 101 User manual Rev 6 December 2019...

Page 2: ...information in this document covers software revision 3 11 Information in this document is subject to change without notice and does not represent a commitment on the part of ELGAS s r o Improvements...

Page 3: ...Communication Layer 15 4 1 2 Transactions on Modbus networks 15 4 2 Device Specific Features 16 4 2 1 Service Address 16 4 2 2 Communication Buffer Length 16 4 2 3 Response Time 16 4 3 Holding Regist...

Page 4: ...ervice configuration section 26 4 4 10 Change password 26 4 5 Modbus function codes 28 4 5 1 Read multiple registers 03h 28 4 5 2 Force single coil 05h 29 4 5 3 Write multiple registers 10h 30 4 5 4 S...

Page 5: ...Modbus 16 bit signed integer value MSB The least significant byte LSB A vendor neutral communication protocol intended for supervision and control of automation equipment RS 485 The most significant...

Page 6: ...y with the EN 60079 11 as an intrinsically safe device and is approved for potentially explosive atmospheres The transducer is manufactured and delivered in compliance with the following guidelines of...

Page 7: ...dout as well as all control functions are accessible via RS 485 interface The transducer is capable to measure the temperature on request or continuously in preset time intervals and store values in i...

Page 8: ...een 5 to 7 mm Other lengths of cable on request Cable shielding is not connected to the stainless steel stem Power supply The transducer requires external DC power supply Transducer terminal voltage m...

Page 9: ...le 125 ms to 512 s Data memory capacity 80 values Time base accuracy 100 ppm Electric insulation Resistance between the stem cable shielding and signal or power supply wires is greater than 10 M at 50...

Page 10: ...1 5 The certificate registered under No FTZ 18 ATEX 0142X at the Physical Technical Testing Institute Ostrava Radvanice notified body No 1026 Environment classification Zone 1 2 according to the EN 60...

Page 11: ...the connector pins carry the following signals Signal Description color GND negative power rail ground green PWR positive power rail brown DATA RS 485 inverted data signal yellow DATA RS 485 non inver...

Page 12: ...receiver can be used in the host however for the low power applications with unterminated bus it is recommended to use a driver with a reduced slew rate and a receiver with a high input impedance Suit...

Page 13: ...r which are necessary for the requested function are powered on Due to the power consumption management the supply current varies significantly depending on the function being performed Figure 5 shows...

Page 14: ...ous measurement periods The values include power consumption during the measurement and during necessary communication with the host to initiate the measurement and read measured values Measurement pe...

Page 15: ...us access There can be one master and up to 247 slave devices Only the master can initiate a transaction Transactions are either a query response or broadcast no response During the query response tra...

Page 16: ...he small dimensions of the transducer no DIP switches or similar components can be used for slave address setting Instead the slave address is software configurable In some cases however the slave add...

Page 17: ...olding Registers Map Overview An overview of all holding registers of the transducer is shown in the table Description of the individual registers is in the following paragraphs Section name Register...

Page 18: ...ister uint N N 40084 not used N N Datalogger section 40085 Delay uint N N 40086 Period uint N N 40087 Number of samples uint N N 40088 40167 Data memory uint 80 N N Memory locations marked in column S...

Page 19: ...correctly handled by the analog to digital converter and numerical calculation If the temperature value is outside the measurement range but inside the operation range the measurements are still perf...

Page 20: ...to prevent accidental change of settings Modbus slave address contains address to which the transducer responds When entering a new address this is valid immediately after writing to this register Gro...

Page 21: ...t significant for user Temperature stores actual measured temperature The value stored as unsigned integer with range from 0 to 65535 0 corresponds to the Operating range lower limit and 65535 corresp...

Page 22: ...t when the data memory overflows This can happen when the datalogging is in progress and master fails to read and erase the stored data quickly enough see sections 4 5 5 and 4 5 6 4 10 Not used 3 Cont...

Page 23: ...A few different data types are used to represent various parameters stored in the transducer s memory uchar 8 bit unsigned value Range from 0 to 255 The 8 bit value is stored in the Least significant...

Page 24: ...ent 0006 Start continuous measurement 0017 Unlock user configuration section 0018 Unlock service configuration section 0025 Change user password 0026 Change service password 4 4 2 Reset Forcing the Ma...

Page 25: ...the response the master waits until the measurement is finished The master can either wait for a fixed time which is equal or longer than the measurement time see paragraph 4 3 3 or it can poll bit 0...

Page 26: ...ock service configuration section coil ON when the correct value is written in the Password registers unlocks the service and user configuration sections of registers 40055 40066 for write operation T...

Page 27: ...5 Force coil 0025 Change user password ON If the change password function has been enabled in step 2 the password is changed and immediately stored into EEPROM together with a copy of the holding regi...

Page 28: ...paragraphs including example queries and responses Normal responses are shown If an error is found during the query processing an exception response is generated by the transducer as described in sec...

Page 29: ...s of register 32h LSB 15 10 CRC Lo xx 11 CRC Hi xx 4 5 2 Force single coil 05h Forces a single coil to either ON or OFF state Forcing the particular coil ON initiates assigned function as described in...

Page 30: ...rd protected sections no data are written and exception response Illegal address is generated see paragraph Chyba Nenalezen zdroj odkaz The query specifies the registers to be written The requested da...

Page 31: ...oups can be created Beside this all transducers belong to group 0 by default bit 0 in the Group Assignment Byte is always considered to be set regardless its real state Transducers assigned to the sam...

Page 32: ...g command Query Period Period Period Sample 1 Sample 4 Sample 2 Sample 5 Sample 3 Query Response Response Synchronize datalogging Synchronize datalogging Communication Measurement time Figure 7 Using...

Page 33: ...xx 4 5 6 Erase data 47h Erases desired number of the oldest temperature samples from the data memory Remaining samples are moved at the beginning of the data memory If the requested number of samples...

Page 34: ...its own serial number is equal to the serial number transmitted in the query it sets its own slave address to the value transmitted in the query and responds to it The other transducers do not perfor...

Page 35: ...35...

Page 36: ...echoes the function code of the original query in the function code field of the response All function codes have a most significant bit MSB of 0 their values are all below 80 hexadecimal In an excep...

Page 37: ...owable address for the slave For example an attempt is made to write into password protected memory locations without correct password being entered 03 Illegal Data Value A value contained in the quer...

Page 38: ...ironments 3 SN EN 60068 2 6 ed 2 2008 Environmental testing Part 2 6 Tests Test Fc Vibration sinusoidal 4 SN EN 60079 0 ed 4 2013 A1 2014 Rev 2 2014 Explosive atmospheres Part 0 Equipment General requ...

Page 39: ...mperature Transducer EDT 101 Author Jan V published ELGAS s r o Ohrazenice 211 533 53 Pardubice Czech Republic tel 420 466 414 500 511 fax 420 466 411 190 http www elgas cz e mail sales elgas cz Date...

Page 40: ...H101AN_201912_EDT101...

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