Product Details:

No. Of ChannelsOne configurable Sensor Input, One Relay Output & Built-in RS485 Communication
Power12 – 24V DC
ApplicationRemote Monitoring/Control, IOT, Modular add-on channel


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.

Additional Information:

  • Item Code: OB-215
  • Port of Dispatch: New Delhi, India

Technical Specifications:

Rated DC power supply voltage, V12 – 24
The error of measuring DC voltage in the range of 0-10 V, min1%
The error of measuring DC in the range of 0-20 mA, min1%
Temperature measurement range (NTC 10 KV), °C-25…+125
Temperature measurement range (PTC 1000), °C-50…+120
Temperature measurement range (PT 1000), °C-50…+250
Temperature measurement error, °C±2
Max. pulse frequency in the “pulse counter” mode, Hz200
Max. pulse frequency in the “logic input” mode, Hz20
Readiness time, max, s0.4
Max. switched current with active load, A8
Consumed current, max, mA100
Weight, max., kg0.3
 Overall dimensions, mm18 х 90 х 64
 Quantity and type of relay contact (switching contact)1
 Wire cross-section for connection, mm²0.5 – 1.0
 Tightening torque of screws, N*m0.4
 Installation is on standard 35 mm DIN-rail 
 Protection rating of the deviceIP20
 Electric shock protection classII
 Climatic design versionUHL 3.1
 Permissible contamination levelII
 Overvoltage categoryII
 Position in spacearbitrary
 Rated operating conditioncontinuous
 Communication InterfaceRS (EIA/TIA)-485
 ModBus data exchange protocolRTU / ASCII
 Housing material is self-extinguishing plastic

OB-215 meets the requirements of the following:

  • EN 60947-1:2014, Low-voltage switchgear and control-gear; Part 1; General rules;
  • EN 60947-6-2:2014, Low-voltage switchgear and control-gear; Part 6-2; Multiple function equipment; Control and protective switching devices;
  • EN 55011:2014, Electromagnetic compatibility; Industrial, scientific and medical RF equipment; Electromagnetic interference characteristics; Limits and methods of measurement;
  • IEC 61000-4-2:2008, Electromagnetic compatibility; Part 4-2; Testing and measurement techniques; Electrostatic discharge immunity test.