Multitech BL-Series Spezifikationen PDF herunterladen (Seite 32)

Rotating Prism Sign Details

The Outstation Transmission Unit (OTU) is the device used to enable the Instation to communicate with Rotating

Plank Signs. A Radio Base Station and Radio Out Station are also part of this system as shown in the

diagram of the

OTU Communications System.

The Radio Outstation is allocated an Address and RF channel which is set up using DIP switches within the unit.

When communicating with The Outstation, the Instation will send a command to the Radio Base Station to select the

required address and channel.

The OTU has 2 write ports (0 and 1) and 4 read ports (0 to 3), both write ports and read ports 0 and 1 are used to

communicate with signs, the other read ports (2 and 3) are reserved for use with Count Sites.

The number of bits required to drive a sign depends on the number of faces that are to be displayed. So it is not

always necessary to use a complete port to control a sign, in the diagram the two OTU write ports are shown

connected to four signs, each using four bits. Read ports 0 and 1 are also connected to the signs and are polled by

the system software to check that the appropriate bits have been set.

To enable the system to select the required legends (or faces) in response to message requests from the associated

zone the following details need to be configured:

Address

This field defines the

radio address on which the OTU is operating.

RF Channel

This field defines the radio channel number on which the OTU is operating.

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Multitech BL-Series Spezifikationen Seite 32