Elseta IOMOD HT Podręcznik użytkownika - Strona 3

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1. Introduction

IOMOD HT is used for temperature and humidity data monitoring and relay control over Modbus.

Device is also capable of switching relays automatically (thermostat function) as configured.

2. Features

•

Temperature and humidity sense with ±0,1 % and ±0,1 ° C accuracy;

•

Temperature sensing range from -10 up to 60 ° C;

•

Humidity sensing range from 0 to 100%;

•

Two Relays which can be configured to turn on automatically on humidity or temperature

triggers (only Advanced version);

•

Relays automation configuration over USB or Modbus;

•

Configurable Modbus settings, such as Slave ID, Baudrate, Parity and stop bits, RS485

terminating resistor, etc.

•

Firmware Upgrade over USB;

•

Two connectors for power supply and for RS485, for easier device connection on one line;

3. Device working information

IOMOD uses Modbus (RTU) protocol over RS485 connection, which can be used with cable length

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

baudrate, 8N1, Slave address - 1.

To read temperature and humidity, user can use device with default settings without configuring it.

To read humidity, send 04 Modbus command (Read Input Registers) with resolution of first register

(0). Returned value will be measured in % and will be multiplied by 10, to show one decimal place.

To read temperature, send 04 (Read Input Registers) with resolution of second register (1).

Returned value will be measured in ° C and will be m ultiplied by 10. To enable thermostat function,

user can configure device over USB or over MODBUS. Configurable options shown in table below.

CONFIGURABLE OPTIONS

Slave Address

Baudrate

Data, Stop and Parity bits

RS485 Terminating Resistor

1 Relay active mode

1 Relay active range

2 Relay active mode

2 Relay active range

Default Settings

IOMOD HT

12/17/2015

OVER USB

OVER MODBUS

Yes

V0.6 | ELSETA | Introduction

4. Supported MODBUS functions

01 (0x01) Read Coils Status

Reads status of relays (Off or On). IOMOD HT has 2 relays on addresses 6 and 7 (Only for IOMOD

HT Advanced).

03 (0x03) Read Holding Registers

Reads current configuration of relays.

Address 2 – Active Mode for 1 relay (humidity or temperature);

Address 3 – Lower Active value (minimal value for relays to turn on) for 1 relay;

Address 4 – Upper Active value (maximum value for relays to keep turned on. If parameter reaches

threshold bigger than this value, relay is turned off) for 1 relay.

Address 5 – Active Mode for 2 relay (humidity or temperature);

Address 6 – Lower Active value (minimal value for relays to turn on) for 2 relay;

Address 7 – Upper Active value (maximum value for relays to keep turned on. If parameter reaches

threshold bigger than this value, relay is turned off) for 2 relay.

04 (0x04) Read Input Registers

Reads current Humidity and Temperature status. Address 0 – Humidity; Value is multiplied by 10 to

show one decimal place. For example: 23.3 ° C will b e show as 233; 50.0 % will be shown as 500 in

the Registers.

05 (0x05) Write Single Coil

(Only for IOMOD HT Advanced).

Sets single relay On or Off. 1 Relay address – 6

06 (0x06) Preset Single Register

Sets single configuration (Only for IOMOD HT Advanced).

Address 2 – Active Mode for 1 relay: 0- disabled; 1 - humidity or 2 - temperature;