Elseta IOMOD 4RTD Manuale d'uso

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IOMOD 4RTD User Manual Modbus

Introduction

IOMOD 4RTD is used for temperature data monitoring over Modbus or IEC-60870-103 using resistance temperature

detector (RTD) platinum sensors. Up to 4 RTD temperature sensors can be connected at once.

Features

● Temperature sense with ±0.5 °C accuracy over all operating conditions;

● Selectable PT100 ar PT1000 RTD temperature sensor for every channel (2, 3 or 4 wire);

● 2.5kV(rms) isolated RTD inputs;

● Configurable temperature and sensors' fault detection for every channel;

● Temperature sensing range from -200 up to 800 °C when using platinum RTD sensors;

● Configurable Modbus or IEC-60870-103 settings: Slave ID, baud rate, parity and stop bits, RS485 terminating

resistor, etc.

● Firmware upgrade over USB.

Operational Information

IOMOD uses Modbus (RTU) or IEC-60870-103 protocols over RS485 connection, which can be used for cable lengths up

to 1500 meters and connect up to 30 devices on one line. Default Modbus and IEC-60870-103 settings are: 9600

bauds/s baudrate, 8N1, Slave (Link) address - 1.

To read temperature using Modbus (RTU) protocol user can use device with default settings without configuring it. To

read temperature from RTD sensor, send 04 Modbus command (Read Input Registers) with resolution of two registers

from 0 to 7. Odd numbers represent least significant words, even numbers represent most significant words. For

example, to read temperature measured by first RTD, read register 0 and 1, where register 0 is least significant word.

Two words read by Modbus represent a float type (IEEE-754 compatible) variable.

For further information regarding setting temperature parameters and configurable options please refer to table shown

below, also supported MODBUS functions described in paragraphs described below.

CONFIGURABLE OPTIONS

Slave Address

Baudrate

Data, Stop and Parity bits

RS485 Terminating Resistor

RTD parameters

Default settings

Setting temperature limits

Fault configuration

Status LED

Status LED can be in 2 colors :

Blue - Device connected to USB.

Green - Normal operation.

Rx/Tx LED

The RX/TX LED on the IOMod flashes when data is either being transmitted or received via the RS485 port.

OVER USB

Yes

OVER MODBUS

Yes