Goblin – Operational Manual
TRINITY
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Communication
In addition to the industry standard RS-485 communication port, other communication
options: USB 2.0 and pen drive for downloading of logged data are also available in
Goblin. These options make it possible for a user to select Goblin to provide power
and energy information into a variety of existing or new control systems. Each
communication option supports data transfer with external devices or applications.
Metering measurement, logged data, configuration and status data may be accessed
via communication.
Modbus RTU on RS485 Port
For connection to a SCADA software, Goblin supports an RS485 port with MODBUS-
RTU protocol. The station id for every meter is site selectable, and so is the baud
rate. The data which can be read using MODBUS query # 3 (Read Holding Registers)
is provided in an address map, with the applicable multiplication factors, vide
Appendix A.
Communication line parameters: 9600 or 19200/8/N/1.
The register map is described in Appendix A. All addresses are in decimal whose
parameters are unsigned long. If illegal address is sent in query or the host, tries to
read more than 64 bytes of data in one query exception message is generated.
Reserved values are for future use, which are transmitted as zeroes.
Data Logging using USB Port and Pen drive
Goblin has a 2 MB non-volatile memory. This memory is used to store the minimum
and maximum values of important parameters, events as defined by the user and the
snapshot of the entire electrical system where all instantaneous and integrated
parameters along with Harmonic data are saved. Maximum numbers of such
electrical snapshots are 19691.
While the electrical snapshots as saved in the logs can give a good idea of the overall
behavior of the system, the Event Log feature captures time-stamped records of
important power system occurrences that can be aligned with corresponding
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