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Rotating Prism Sign Details
Port Number
Defines which output/input port on the OTU the current sign control bits are
designated to.
Port No 0 designates the "Bits for Sign" to reference output port 0 and input
port 0 of the controlling OTU
Port No 1 designates the "Bits for Sign" to reference output port 1 and input
port 1 of the controlling OTU.
See
OTU Equipment Description
Bits for the sign
A rotating plank sign is controlled by opening and closing a set of contacts
connected to the drive electronics. The OTU provides a means of operating
the contacts. Each address and port number designates a set of 8 bits which
can be used. The number of bits actually required for each type of sign is
dependent upon the number of faces being driven. Typically the sign only
requires 4 of the 8 bits defined by that address and port number. The bits not
designated to this sign will not be used and are available for use by another
sign
See
OTU Equipment Description
Legend to Define/Defined Legend
A rotating plank sign can support up to 10 legends.
For each legend a bit pattern is required. The bit pattern is translated by the
OTU hardware into a combination of open and closed contacts which will
cause the required sign face to be moved into the visible position. For
information regarding the required bit patterns and sign faces available refer
to the sign manufacturers interface data.
The system uses the bits returned on the associated input port to confirm that
the sign has set the correct aspect. The sense of the inputs must be identical
to that sent out (i.e. if a 1 is used as a demand then the returned bit must also
be a 1).
The translation between the
zone state and the legend number selected is
defined within the message definition menu.
file:///A|/html/sign_prism_details.htm (2 of 2) [27/06/2001 20:45:39]
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