isHRT FDT

isHRT CommDTM
The Device Type Manager isHRT CommDTM is compatible to all FDT 1.2 compliant frame applications (Pactware, Fieldcare etc.). It requires the isHRT USB communication interface as its hardware base. The CommDTM takes care of the management and configuration of the communication interface. It replaces the vendor specific configuration software with a standard FDT approach. The CommDTM can be compared to a device driver which facilitates the communication between the field devices at the HART bus and their device DTMs. It therefore supports the commissioning of the field devices from one central workstation. The communication interface can be employed as a primary as well as a secondary master. The configuration window of the CommDTM enables the user to switch between the two options. The retry limit and the number of preambles may also be set through the configuration window.

Bus Scan. The function "Device List" allows the scan for devices attached to the HART bus. All devices, which can be reached through a polling address, are listed. Additional information is available for every device found, including the tag, the vendor identification, the device type and the device ID.

Change of Poll Address. In order to change the poll address of a device, it can be selected from the device list. A new window opens which permits the setting of the new poll address. The CommDTM secures that the device is not currently in use by any DeviceDTM. The device state is indicated in the device list. The CommDTM also checks whether the new poll address was already taken by another device, preventing an address overlay between different field devices.

General Functions. DeviceDTMs can be connected to a field device using the poll address as well as the long address of the device. The CommDTM supports both addressing options.