The dev kit based on Raspberry Pi opens HART-IP field communications FieldComm HART-IP Developer Kit combines RPi 3B+, WaveShare High Precision AD /DA Board, DLSRKIT PoE HAT and open source software to learn the HART-IP connection protocol for field devices.

The FieldComm Group announced the launch of the HART-IP Development Kit based on Raspberry Pi, which enables the evaluation, demonstration and prototyping of devices using HART-IP, a version of the company’s field communications solution based on the HART communication protocol. Approximately 375 members of the FieldComm group, representing equipment suppliers to the manufacturing industry, are responsible for more than 40 million HART-compliant field equipment applications. HART is by far the most widely used communication protocol in manufacturing companies around the world, the company said.

The dev kit based on Raspberry Pi opens HART-IP field communications
HART-IP development kit

The HART bi-directional communication protocol, which is an IEC standard, is used to transmit and receive digital information via analog 4-20mA circuits connecting field devices to distributed control systems. HART provides two simultaneous 4-20mA communication channels that are also used to power the remote I/O field device: a standard analog channel and a digital signal through frequency manipulation that contains device information such as PV, device status, diagnostics and other values.

HART-IP is a newer protocol that allows the HART communication protocol to work over Ethernet and other IP networks. HART-IP is mainly used for backhaul communication, works with redundant Ethernet media up to Gigabit Ethernet and is compatible with both mesh or ring topology and Power-over-Ethernet (PoE) technology.

The dev kit based on Raspberry Pi opens HART-IP field communicationsThe dev kit based on Raspberry Pi opens HART-IP field communications
HART-IP Concept Circuit Diagram (left) and HART-IP Development Kit
Network Diagram (click on the images to enlarge).

HART-IP eliminates the need for conversion between analog and digital systems with labour-intensive and error-prone data display via Modbus RTU or TCP/IP, FieldComm explains. HART-IP can also integrate communication with the FieldComm WirelessHART platform by supporting WiFi technology.

HART IP Development Set Details

The HART IP SDK we saw on EENews Embedded is a three card set that contains a Raspberry Pi 3B+ card, a PoE card and a very accurate Waveshare AD/DA card. There’s also the zebra case.

The dev kit based on Raspberry Pi opens HART-IP field communicationsThe dev kit based on Raspberry Pi opens HART-IP field communications
HART-IP Development Kit with Waveshare card in Zebra housing (left) and PoE card (DSLRKIT Power Over Ethernet PoE HAT)
(click on images to enlarge)

The AD/DA is a supplement to Raspberry Pi for analog-to-digital conversion, which is sold at $30. Other Waveshare RPi add-ons include a PoE calculation module board for the purple CM3 Pi.

Waveshare’s high-accuracy AD/DA card features a 16-bit DAC, an 8-channel 24-bit ADC and an AD/DA I/O compatible with the Waveshare sensor interface standard. There are also a 10K potentiometer, a crystal, a 40-pin GPIO and other components available, which are described below.

The dev kit based on Raspberry Pi opens HART-IP field communicationsThe dev kit based on Raspberry Pi opens HART-IP field communications
Detailed display and legend of the high-precision Waveshare
AD/DA card (press photos to enlarge)

The PoE card is a Power Over Ethernet PoE HAT DSLRKIT that costs between $19 and $21. IEEE 802.3at Type 2 is equal to PoE+ HAT and supports a maximum power of 20 W DC5V 4A with 1.5 kV insulation.

The software running on Raspberry Pi is downloaded to a microSD memory card and contains an image of Ubuntu Mate Linux, a HART IP server and the Flow Device application from FieldComm. There is also a HART IP client application that runs on a connected Windows PC and communicates with the Ethernet switch. You can use PuTTY to remotely access the Raspberry Pi command line interface.

The open source software hosted by GitHub includes sample code for the violet PI stack and a demonstration of a HART IP field device with integrated EDD and FDI Device Package. There is also a sample project folder for EDIs and an ESD source.

FieldComm plans to upgrade the HAT PoE with a plug-in Ethernet module that supports 2-wire Ethernet APL. Other planned updates include the introduction of an AU-based process automation model (PA-DIM) into the RCOPC system, ensuring compatibility with OPC UA applications, and support for JSON and XML files for use with RCOPInfo Lightweight Gateways.

Additional information

The HART IP Development Kit is available for $995 for FieldComm group members and $1495 for others. More information can be found on the advertising and product page.what is raspberry pi,linuxgizmos,linux sbc,embedded linux board,hackerboard