EPAC300-M50 SERIES USER’S MANUAL
AUGUST 2005 PAGE 18 OF 46
3.9.1.1 Data Key Option
The optional Data Key is used by the EPAC M50 series software to hold the
intersection data. Once the intersection data is entered via the front panel key pad,
or via a download, the intersection data can then be transferred to the Data Key.
The Data Key may then remain inserted in the EPAC M50 series controller
indefinitely while the intersection is being controlled. If the controller cabinet is
knocked-down, the Data Key can then be removed from the damaged controller
and inserted into the replacement controller to transfer the intersection data. The
Data Key is used in lieu of another memory device (such as a memory stick) as the
Data Key has positive retention, and is designed for harsh environments, such as
chemical plants and military equipment. The Data Key is NOT used to hold the
EPAC intersection control software. Intersection control software may be reloaded
via a laptop PC or PDA, either via C50 RS-232 connector, or via Ethernet.
3.9.1.2 (2) RS-232 Ports Option
The optional (2) RS-232 Ports consists of a 25-pin RS-232 port, as well as a 9-pin
RS-232 port. Both of these two ports are logically connected to NEMA Port 3,
meaning that NEMA Port 3 is transmitted on both of these two RS-232 ports
simultaneously, as well as on the fiber optic port (if used). The data received on
these two ports is logically OR’ed together, and also logically OR’ed with the fiber
optic port (if used).
3.9.1.3 Fiber Optic Option
The optional Fiber Optic port consists of two fiber optic transmitters, plus two fiber
optic receivers, logically connected to NEMA Port 3. Data received on either fiber
optic receiver is sent to the controller, as well as the other fiber optic transmitter.
The Fiber Optic option acts as a repeater, receiving controller data, plus boosting
and retransmitting the signal to the next controller. If received message is
destined for this controller, the controller reply is transmitted simultaneously on
both fiber optic transmitters, as well as on the (2) RS-232 Ports (if used). The Fiber
Optic Option is available in either multi-mode or single-mode.
3.9.2 Standard Computer Boards (Future)
The EPAC300-M50 series includes seven ITU 3-U size (also known as “half-height)
expansion slots. The right-most slots behind the removable Front Panel may be
used for memory expansion, disk drive or other devices that have no cables. The
left-most slots are exposed to allow use of serial communications, parallel
input/output or other devices that require cable protrusion from the front. This
module size was chosen to house standard industrial-strength computer modules
from a number of third party vendors as a future option.
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