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DCN Next Generation Open Interface Release 2.4 General

en | 15

Bosch Communications Systems | 2007 February | SRS_INF | Du010933

the range 0-1000. The value 0 (zero) implies that the heartbeat

check will be turned off. Note that heartbeat message is still

allowed (for synchronisation purposes).

wNrRetries The number of retries to be done before the packet will be

discarded. Valid values are in the range 0-10.

Note that this count includes the retransmission upon the

reception of a NAK-packet.

wRetryTime The time between the retries in seconds when no responses

are received. Valid values are in the range 1-100.

Note that this message will only be accepted if the message is transmitted over the serial line.

As a response upon the reception of this message the CCU will return the same message to

the remote controller with the newly set values of the parameters (if accepted). The ‘wFnId’

value is set to the value RSMC_RSP_COMMUNICATION_PARAMS. If any of the parameters

is rejected, the original value (before the call) is returned to the remote controller.

3.3 Ethernet message layout

Each message must have this layout:

MessageType Length Data

Defined in (c-style) structure format:

struct {

DWORD dwMessageType; // Message Type

DWPRD dwLength; // Message Length

BYTE byData[]; // Message Data (length – 8 bytesError!

Reference source not found.)

};

Where:

dwMessageType The “message-type”, which describes the content of the actual

data passed.

dwLength The total length of the message in number of bytes, including

the sizes of the message-type and length. The length must

match the actual transmitted size of bytes.

Since the MessageType and the length are always present, the

minimum size of the message is 8 bytes. The maximum size of

a message is 8000 bytes.

byData Data corresponding to the description of the message-type. The

data represents a structure which format is explained hereafter

together with the message-type.

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Bosch DCN Next Generation Manuale Utente Pagina 15