Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL DS-TT RFL Electronics Inc.
January 31, 2008 12 (973) 334-3100
FUNCTIONAL DESCRIPTION
The following is a basic description of how the RFL DS-TT module operates. A simplified block
diagram of the module appears in Figure 6.
SYSTEM OVERVIEW
The transfer trip module is a channel card for use in the IMUX 2000 system. It transmits and receives
data via the T1/E1 serial link and generates and receives trip commands via an I/O adapter module. Up
to four trip inputs and four trip outputs can be supported. The module can be setup and interrogated
remotely via the SCB of the IMUX 2000. For local setup and interrogation, an RS-232 port is
available. Front panel LEDs indicate the status of the trip inputs and outputs. A real time clock with
sequence of events storage is also available.
The module consists of three major sections. The microcontroller section contains an 80C320
embedded microcontroller and associated support devices. The trip FPGA (field programmable gate
array) and its associated circuits handles all T1/E1 communication and trip I/O. The SCB FPGA
connects the processor with the SCB of the IMUX 2000. Miscellaneous other circuits are present to
handle other functions. A switch is provided to disable the card for removal and insertion, and a
jumper is provided to select between relay and solid state outputs.
MICROCONTROLLER CIRCUIT
The heart of the microcontroller circuit is an 80C320 8 bit embedded microcontroller. Its main
purpose is to control the setup and interrogation functions of the transfer trip module. It does not do
any processing of the T1/E1 data and trip signals. A PSD312 programmable device provides 2KB of
RAM, 64KB of ROM, and port reconstruction for the 80C320. It is connected to ports 0 and 2 of the
microcontroller. A DS1642 device provides non volatile RAM, a real time clock function, and
contains an embedded clock and battery. A MAX691 device provides a reset pulse on power turn on
and a watchdog timer function.
TRIP FPGA CIRCUIT
The trip FPGA interfaces directly with the T1/E1 bus of the IMUX chassis. It is also connected to the
trip inputs and outputs. Supporting the trip FPGA are two EPROMs which contain the transmit and
receive CRC codes.
SCB FPGA CIRCUIT
The SCB FPGA circuit is used to communicate with the CM3B via the SCB. The transfer trip module
type ID of 118 is encoded into the SCB FPGA device.
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