Baseline Spec Template - NEXRAD Radar Operations Center

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Document Number 2620002GCode Identification 0WY55WSR-88D ROCTBDDUAL POL - DRAFT3.1.3.4 Data Acknowledgement Message3.1.3.4.1 Data Acknowledgement Message HeaderThe data acknowledgment message has the following header:TCM DATA ACK Message HeaderMessage Code = 3 Sequence Field Message Length = 0 4 octets 4 octets 4 octetsWhere Message Code is for the DATA ACKNOWLEDGMENT message type which is 3. This messageshould be sent by the receiving user application when a data message with non-zero sequencenumber is received. It is sent on the same PVC the data message was received. The "sequence" fieldcontains the same number as the data message to be acknowledged. There is no data following theheader so the message length is 0.3.1.3.5 Keep Alive Message3.1.3.5.1 Keep Alive Message HeaderThe keep-alive message has the following header:TCM KEEP ALIVE Message HeaderMessage Code = 4 Initializing Loopback Message Length = 0 4 octets 4 octets 4 octetsWhere Message Code is for the KEEP ALIVE message which is 4. When a user application on oneside of the PVC needs determine whether the line is still OK, it sends this message with a non-zero"init" field. A user application on either side, upon receiving this message, should respond by thesame message with "init" reset to 0. There is no data following the header so the message length is 0.3.1.4 Error HandlingEither side of a session link will close and disconnect TCP connections for all PVCs on the detectionof an error on any PVC. A disconnected client may attempt to reconnect at any time.3.1.5 DisconnectTo disconnect the RPG session, simply close TCP connections for all PVCs. The session layer is notestablished unless all PVCs for the link have valid TCP connections.3-4
Document Number 2620002GCode Identification 0WY55WSR-88D ROCTBDDUAL POL - DRAFT3.2 Application <strong>Spec</strong>ific3.2.1 Data FormatsThe following data formats are referenced in this document:Code*1One byte (8 bits) of integer data representing a bit field.Code*2Integer*1Integer*2Two bytes (16 bits) of integer data representing a bit field.One byte (8 bits) of unsigned integer data.Two bytes (16 bits) of unsigned integer data.Integer*4Four bytes (32 bits) of unsigned integer data.Real*4 Four bytes (32 bits) of single precision floating point data in IEEE 754format.Real*8 Eight bytes (64 bits) of double precision floating point data in IEEE 754format.Scaled Integer*1Floating point data represented by a 1-byte unsigned integer with anassumed decimal point whose position is defined by the precision of theitem.Scaled Integer*2Floating point data represented by a 2-byte unsigned integer with anassumed decimal point whose position is defined by the precision of theitem.Scaled Integer*4Floating point data represented by a 4-byte unsigned integer with anassumed decimal point whose position is defined by the precision of theitem.Scaled SInteger*2Floating point data represented by a 2-byte signed integer with anassumed decimal point whose position is defined by the precision of theitem.Scaled SInteger*4Floating point data represented by a 4-byte signed integer with anassumed decimal point whose position is defined by the precision of theitem.SInteger*1One byte (8 bits) of integer data in standard 2's complement format.SInteger*2SInteger*4StringTwo bytes (16 bits) of integer data in standard 2's complement format.Four bytes (32 bits) of integer data in standard 2's complement format.One or more 8-bit data items, each representing one ASCII character.Values that do not take up the entire field size will be padded with NULLcharacters.3-5
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