Det-Tronics OPECL Infrared Hydrocarbon Gas Detector - Manual (Page 39)

10.1 F-1 95-8556
Appendix F
HART CommuniCATion
Digital communication with the Open Path Eclipse is necessary to monitor internal status and to modify the factory
settings. This appendix provides guidance on establishing HART communication, and describes the communi-
cation menu structure when using the Open Path Eclipse with the HART Handheld Communicator.
inTeRConneCTing THe HART CommuniCAToR wiTH THe open pATH eClipse
Unscrew the protective cap from the HART communication port on the side of the Open Path Eclipse receiver.
Connect the HART Communicator to the two terminals inside the port. Press the "on" key to switch on the HART
Communicator. The Online menu is the first menu to appear when the Communicator is properly connected to
the Open Path Eclipse. This menu is structured to provide important information about the connected device
immediately on powering up the Communicator. This menu displays up-to-date device information including pri-
mary variable, analog output, lower range value, and upper range value.
Note
the HARt protocol incorporates a concept called the "Device Description Language" that enables all sup-
pliers of HARt instruments to define and document their products in a single consistent format. this format
is readable by handheld communicators, PC's and other process interface devices that support DDL. DDL
enables full interoperability of devices, regardless of manufacturer, allowing full functionality from any HARt
device.
In the event that your Communicator does not establish communications with the Open Path Eclipse, you may
need to ensure that the appropriate DDL’s for the OPECL are included within your Communicator. To review the
device descriptions programmed into your HART Communicator:
1. From the Main menu, press to access Offline menu.
2. From the Offline menu, press New Configurations to access the list of device descriptions programmed into
your HART Communicator. The Manufacturer menu displays a list of each manufacturer with device descrip-
tions currently installed in your Communicator’s Memory Module. The standard 12 MB Memory Module is
recommended, as it allows for more device descriptions.
3. Select a manufacturer, and the Model menu displays, containing a list of currently installed device models
provided by the selected manufacturer.
4. Review the different manufacturers and models to determine the installed HART-compatible devices in your
Communicator.
If you cannot find the OPECL device on your Communicator, the device revision you are looking for is not pro-
grammed into the Memory Module. In this instance, you are limited to what is available using the generic interface
built into your HART Communicator.
The HART Communication Foundation (www.ccsi.com/hart) manages a library of Manufacturer Device
Descriptions, which are distributed to programming sites for inclusion in master devices. A complete listing of
the HCF DD Library is available for download in manufacturer and device type sequence.
Note
If a device is found, the HARt Communicator displays the online menu. If no device is found, the
Communicator displays the Main menu. If no device is found, check the connections, verify the presence of
a minimum of 250 ohms load resistance in series in the loop, and retry by selecting ‘online.’ to poll multiple
devices in the loop, refer to the HARt Communicator manual.