System Description ____________________________________________________________________
RF-MCGARDPRO
Hubbell Power Systems, Inc.
–
RFL™
Products
July 1, 2022
©2022 Hubbell Incorporated
2-11
When the GPS built-in receiver is included, it resides as a piggy-back module on the System I/O
Module. The GPS receiver must be connected to an externally mounted antenna, provided as an
accessory as shown below.
Figure 2-9. GPS Antenna
Also located on the System I/O Module is a six pin (RS-485) terminal block for use with the DNP
protocol. The six-pin connector is always installed, but only used when DNP is enabled over RS-
485. The Ethernet port is used for remote management purposes. An RS-232 port is also
available for management.
Power Supply I/O Module:
The Powers Supply I/O Module has the following three functions:
•
Connects the internal power supplies to the external power source(s)
•
Provides major and minor alarm relay contacts
•
Provides access to the digital interface (RS-449/X.21/V.35) or G.703