Digital I/O OB-215 can be used as the following:

− remote DC voltage trasducer input (0 – 10 V);

− remote DC current transducer input (0 – 20 mA);

− remote temperature meter with the ability to connect sensors NTC (10 KV), PTC 1000, PT 1000 or digital temperature sensor D18B20;

− temperature regulator for cooling and heating plants;

− pulse counter with saving the result in memory;

− pulse relay with switching current up to 8 A;

− interface converter for RS-485 – UART (TTL).

OB-215 provides:

− equipment control using relay output with switching capacity up to 1.84 kVA (8A);

− tracking the state (closed/open) of the contact at the dry contact input.

RS-485 interface provides control of the connected devices and reading of the sensors readings via the ModBus protocol.

Parameter setting is set by the user from the Control Panel using the ModBus RTU/ASCII protocol or any other program that allows working with the ModBus RTU / ASCII protocol.

The status of the relay output, the presence of the power supply and the data exchange are displayed using indicators located on the front panel

ОВ-215 allows data exchanging with external devices via the serial interface of RS (EIA/TIA)-485 via ModBus protocol with the limited set of commands (see Table 5 for a list of supported functions).

When constructing a network, the principle of the master-slave organization is used where OB-215 acts as the slave. There can be only one master node and several slave nodes in the network. As the master node is a personal computer or a programmable logic controller. With this organization, the initiator of the exchange cycles can only be the master node.

The queries of the master node are individual (addressed to a particular device). OB-215 performs transmission, responding to individual queries of the master node.

If errors are found in receiving queries, or if the received command cannot be executed, OB-215 as the respond generates an error message.

ET-485 is a microcontroller unit. It is designed to exchange data over the Ethernet 10BASE-T and 100BASE-T network using the equipment, which is provided with the RS-485 interface and establishing a Modbus network. The standard network mapping using the RS-485 is provided. The unit fulfills the functions of a ‘Modbus Server’ for switching the Modbus clients to the Ethernet network. It redirects the Modbus requests from the clients to the units in the Modbus network and returns their answers to the clients.

ET-485 has:

• Flexible addressing within the Ethernet network (overloading MAC-address, static and dynamic IP- address)
• Access protection over the Ethernet network (password for configuration mode, IP- address filter for setting and switching to the Modbus network)
• Different data transfer modes for Modbus network (RTU and ASCII with/without odd-even check, wide range of transmission speeds, selectable delays)
• Free PC software for programming/settings and monitoring

Interface controller with built-in I/Os for Remote Operation/Monitoring EM-486 provides access to readings of communicable devices, gauges and sensors from their registers of Modbus connected via RS-485 interface with the help of text SMS messages, automatic data gathering from the selected devices, transmitting the gathered data via GPRS or Ethernet to various SCADA interfaces, automatic transmitting SMS alarms of state of selected devices.

EM-486 has:

• Flexible options of connection (via wire or wireless communication, automatic method selection of communicating with a server, automatic or manual selection of GSM provider and communication parameters, resetting of MAC-address and other Ethernet settings);
• Protection of access (password for setting mode, filter of IP-address for setting or connection to Modbus network, connection only to the selected server with automatic log-in, password for control via SMS);
• Different modes of data interchange via Modbus network (RTU or ASCII, with checking of parity for even-odds or without checking, wide range of transmitting rate, adjustable delay);
• Programmable relay outputs for reaction at events and alarms;
• Programmable inputs for sensors;
• Power output for sensors;
• Reserve power supply input;
• Service functions (saving the collected data to flash memory card including the restoring of transmitting in case of communication break down, data single sourcing on the selected external server, software updating option).
• EM-486 meets the requirements of IEC 60950-1:2001 Data processing devices.

EM-486 provides control for MODBUS devices in RS-485 network via Ethernet interfaces or GPRS, or via the SMS. The unit also allows to read data from devices by MODBUS or from connected sensors.

The processor supports connection to the accumulating data cloud server via Ethernet network with a help of micro chip of physical interface of Ethernet (or via GPRS with a help of inbuilt GSM-modem, if connection via Ethernet is not available).

In addition, EM-486 can be connected to Ethernet via MODBUS TCP Protocol to exchange data with MODBUS devices, or with the product. The controller receives and processes SMS with a password and command read/write for Modbus devices.

When inserting a memory card the product reads the internal memory for operational logic – program for data collection and tracking of events. The program runs in the background mode.

Product stores in the internal memory the network settings, parameters of inputs and outputs, the logic of action, the collected data log.

EM-481 provides data collection from connected MODBUS devices, data transfer to the server, data access via MODBUS TCP (GPRS, Ethernet) or SMS text messages (GSM), event tracking and response to events (sending SMS notifications, recording values to MODBUS devices).

EM-481 provides:

· Flexible options of connection (via wire or wireless communication, automatic method selection of communicating with a server, automatic or manual selection of GSM provider and communication parameters,

resetting of MAC-address and other Ethernet settings;

· Protection of access (password for setting mode, filter of IP-address for setting or connection to Modbus network, connection only to the selected server with automatic login, password for control via SMS);

· Different modes of data interchange via MODBUS network (RTU or ASCII, with checking of parity for even-odds or without checking, wide range of transmitting rate, adjustable delay);

· Programming the collection of data, events, and action for events (see Appendix С);

· Service functions (real time clock, firmware updating option).

The device provides control for MODBUS devices in RS-485 network via Ethernet interfaces or GPRS, or via SMS. The device also allows reading data of devices by MODBUS. The processor supports connection to cloud-based data collection server via Ethernet network with a help of microchip of physical interface of Ethernet (or via GPRS with a help of in-built GSM-modem, if connection via Ethernet is not available).

In addition, the device can be connected to Ethernet via MODBUS TCP Protocol to exchange data with MODBUS devices, or with EM-481. The controller receives and processes SMS with a password and command read/write for Modbus devices.

When inserting a memory card the device reads the internal memory for operational logic – program for data collection and tracking of events. The program runs in the background mode.

The device stores the network settings, safety parameters, the logic of action, the collected data log in the built-in memory.