Datasheet PR515x507

I/O modules and communication

Issued 3 November 2026

Thermocouple to Modbus RTU (RS485), with OLED display

Article number PR515x507

PR515 module board from above: OLED display, UP, OK and DWN buttons, relay, USB-C port and terminals 1 to 22

The PR515x507 measures the temperature with a type K thermocouple, with cold-junction compensation on the module, and provides the value as a Modbus RTU register on an RS485 bus. This lets a PLC or HMI read high temperatures as well, such as of exhaust gases or furnaces, without an analogue input. The Modbus address and baud rate are set on the OLED display.

Price on request. Supplied in series, from 10 units per item. Not in stock? Then we build your series. One or a few units only as a trial, for a company with a series in sight.

Specifications

Supply12 and 24 V DC, operating range 11 to 30 V DC
InputType K thermocouple, with cold-junction compensation
Measuring rangeFor example 0 to 600 °C
OutputModbus RTU over RS485; temperature as a register
IsolationNot galvanically isolated; isolated version as an option
SetupOLED display with UP, DOWN and OK buttons
CommunicationModbus address and baud rate adjustable on the display
USBUSB-C for software updates and reading the status
Wi-FiBuilt-in hotspot for software updates
MountingDIN rail, horizontal enclosure
Internally fitted withPR181T21

Setup

  1. Connect the supply, the thermocouple and the RS485 bus (A and B) according to the wiring diagram supplied with the module.
  2. On the display, set the Modbus address and the baud rate.
  3. Store with SAVE and read the temperature with your PLC or HMI; the register list is supplied with the module.