HART Communication Protocol (Highway Addressable Remote Transducer) is a hybrid analog+digital industrial automation protocol which is the most widely used communication protocol in the Process Automation Industries. HART communication protocol is maintained by HART Communication Foundation (HCF) earlier now by FieldComm Group (www.fieldcommgroup.com)
Utthunga has good experience and expertise in various flavors of HART communication protocols like HART RS 485, Bell-202, HART-IP, wirelessHART and HART MUX.
HART 7 Stack
We offer a ready to use HART 7 communication protocol stack conforming to the protocol that enables faster firmware development of HART-enabled field devices. We offer integration and porting of the stack with the target device application and device platform. This includes:
- Porting of the stack library to device hardware platforms including micro-controllers and RTOS
- Integration of the stack library with the device application software or firmware
- Enhancements to the stack library to support the device family as well as device-specific commands
Utthunga’s proprietary framework DPI (Device Programming Interface) with common source base for desktop and mobile (Android and iOS) has been used in developing various Dashboard application, diagnostic and service tools to monitor, parameterize the various instruments using HART Serial (RS 485, Bell 202), HART-IP and HART MUX.
Utthunga can develop HART EDDL based solution using DD interpreters like SDC 625 or EDDEngine for handheld Configurator applications.
EDDL/FDT DTM/FDI solution
Utthunga can provide all Device Integration Standard support for HART protocol like HART DD development and registration or HART Device DTM Development, HART-IP Gateway DTM Development or FDI HART Device or Profile package development. Utthunga can also develop HART FDI Communication Server for your FDI host.
HART board and stack
Utthunga can help you to make your legacy 4-20 mA device to be digital by making it HART compatible using retrofit Utthunga’s HART board and stack.
Utthunga can develop the HART Simulator (H/W and S/W) which can be used to perform load test the Control system by simulating thousands of HART devices.
Utthunga can develop the mobile dashboard application for Android and iOS using its proprietary HART-IP stack and DPI framework which can communicate with HART devices over a network.
HART (Highway Addressable Remote Transducer) is a communication protocol designed for control applications and process measurements. As it combines analog and Digital communication, it is known as hybrid protocol.
Using an analog signal, information is sent only one way, either from the device to the host (inputs) or from the host to the device (outputs). Digital information, on the other hand, can travel in both directions using the HART digital communications signal. The HART Protocol makes use of the Bell 202 Frequency Shift Keying (FSK) standard to superimpose digital communication signals at a low level on top of the 4-20mA. This enables two-way field communication to take place and makes it possible for additional information beyond just the normal process variable to be communicated to/from a smart field instrument. The HART Protocol communicates at 1200 bps without interrupting the 4-20mA signal and allows a host application (master) to get two or more digital updates per second from a smart field device. As the digital FSK signal is phase continuous, there is no interference with the 4-20mA signal.
Some HART devices support the optional burst communication mode. Burst mode enables faster communication (3–4 data updates per second). In burst mode, the master instructs the slave device to continuously broadcast a standard HART reply message. The master receives the message at the higher rate until it instructs the slave to stop bursting.
A slave device is said to be in “burst mode” when it is providing a synchronous cyclic broadcasting of data, without continuous polling by a master device. There may be many devices may be connected in the communication link, but only one device can be in burst mode.
Yes, it is possible to connect HART devices serially. Multi dropping more than 15 devices is possible (when the devices are individually powered and isolated).
The data from WirelessHART devices will not propagate to the host system if the data is deemed questionable from either a HART diagnostic or due to an extended delay in reception at the Gateway from the WirelessHART field device.
The device contacts the network manager to request bandwidth and the Network Manager might take a moment to provide it. That is when the field device initiates Delayed Response (DR) to the application that process the request.
To handle this: The WirelessHART Gateway should provide additional diagnostics for network performance. The Gateway can notify the host system if communication problems exist. Additionally, the Gateway is responsible for WirelessHART network management and network diagnostics.
Universal Commands: All devices using the HART protocol must recognize and support the universal commands. Universal commands provide access to information useful in normal operations.
Common Practice Commands: Common practice commands provide functions implemented by many, but not necessarily all, HART communication devices.
Device specific commands are developed and controlled by respective manufacturer, need to contact them for device specific commands related information.
All HART enabled products need to be registered to FieldComm Group earlier HART Communication Foundation (HCF). The FieldComm Group conducts the testing and provides a test reports for being the product complies with HART Conformance requirements, interoperability and ensures specific devices and systems conform to the same standard.
Registered HART products conformance adherence to the HART specification and increases its acceptance in the market.
From the below link you can download all Registered Wired/Wireless HART DDs
All certified DTMs are available from FDT group web site
Some manufacturers allow HART DDs or DTM to be downloaded from their web sites.
HART technology has been shown to significantly reduce the time required to fully commission a network (loop). For example. devices can be more quickly verified because the device specific and application information are loaded into instruments which can quickly be verified by the host control system. Commissioning is further streamlined by connecting a PC Configurator to each HART communication loop online either through the control system or a multiplexing I/O system. This eliminates the need to move the configuration device from one termination point to the next while commissioning devices on the network. Leading PC Configurator applications also include a loop-test feature which ensures proper connections, and as-installed record-keeping features for long-term documentation and maintenance.