DIN-140 Modbus RTD Input Modules


The DIN-140 RTD input modules contain an isolated 15-bit analog to digital converter and measure RTD temperature sensors. Each module is hardware optimized for the best measurement performance over the sensor input range.  Three different RTD input modules are available, .00385, .00388 and .00392.

The DIN-140 supports two, three and four wire RTD sensor connections. Each module performs all signal conditioning, the analog to digital conversion and produces a linearized temperature output. The values are scaled in 16-bit unsigned integer format that represents a percentage of the full scale temperature range. The data values are transmitted to a host computer using the Modbus RTU serial protocol via an RS-485 serial port.

Download Datasheet

Download Manual

Download Modbus Register Map

Modbus Scaling Overview

The DIN-140 module easily mounts on industry standard 35mm DIN-rail.

Measurement Ranges:
0.00385: -200 to +850C
0.00388: -100 to +125C
0.00392: -200 to +600C

Additional Information


• Regulated +5Vdc, 0.75W max.
• Protected against power supply reversals


• RTD Types: 0.00385, 0.00388, 0.00392
• Accuracy: +/-0.3 deg C.
• Resolution: 0.1 degree C.
• Common mode rejection: 100db at 50/60 Hz.
• Input connections: 2,3, or 4 wire.
• Excitation current: 0.25mA.
• Max lead resistance: 50 ohms.
• Input protection to 120Vac.
• Automatic linearization and lead compensation.


The DIN-140 series remote I/O modules are compatible with all commercial software programs and OPC servers that support the Modbus RTU protocol. Commercials software programs from DreamReport, Wonderware, National Instruments Labview, Indusoft, DAQFactory and DASYLab all support the Modbus RTU protocol. OPC Servers from Kepware and MatrikonOPC support the Modbus RTU protocol.

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