Multitech BL-Series Especificaciones descargar pdf (Pagina 33)

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.

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Multitech BL-Series Especificaciones Pagina 33