E2054 Hardware

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  1. Contents

     

    1. Normal_PPEViewer_Buffer_operaton
    2. E2054_PPEViewer_Enhanced_Operation
    3. E2054_Protocol

     

  2. Normal PPEViewer Buffer operaton

    E2050 and Satellite Data Streams

    The PPE Monitor frame has TCP, File or Serial input. For File input, however the Reload function and the Connect are integrated. Only one type of input be selected and the other is disabled as the option selection is clicked.

    The normal operation of the Viewer is to decode a data stream from a TCP or serial connection out Port A on the PPE Encoder. It is state driven display device so it can handle propagation delays and packeting when channelled through TCP terminal servers. This stream is also automatically sent to a text based log during processing.

    The data streams are buffered and switched to the displays as shown in the diagram below

     

    The serial data is buffered under interrupt control. Timers are used to periodically check the buffers and then strip the data.

    The satellite display has a separate timer.

     

     

  3. E2054 PPEViewer Enhanced Operation

    E2054 Paging System

    The PPEViewer can also interface to the E2054 which uses a protocol to switch multiple data streams via a single port. This mode is selected on the Viewer configuration tab. see E2054 Control 

    Port B on the E2054 provides all the functionality to monitor;

    1. All the standard E2050 functions and commands.

    2. Separate data channels to monitor and control the following;

      1. E2054 system CPU and its command set.

      2. Ability to send paging messages to normal and priority ports.

      3. A system relay to monitor a second E2054 system connected to port A.

      4. Alternatively run a raw device such as an Off Air Decoder connected to Port A.

    The functionality is created with packetising all the data transfers between the Viewer and the E2054 as shown below.

     

     

     

  4. E2054 Protocol

    E2054 Packet Control

    The PPEViewer uses the E2054 packet control to perform  a variety of commands and logging tasks. Each packet contains header information to identify where the packet is to go in the E2054 as well as the type of packet it is. All packets are variable format thought the length limit is 500 bytes.

    From the main flow diagram sending a pager message via the wireless broadband input uses the following components.

     

    An example of the handshake of the protocol to perform the simple task of sending a paging message is shown below.

     

    Port B is the input physical port on the E2054.

    VC is the virtual channel state machine in the E2054.

    Port E is the output physical port on the E2054 which is hardwired to Port B of the E2050.

     

 

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Last modified: 01-Jun-2022