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DM240XR High-Speed Digital Modulator User Interfaces

MN-DM240XR– Revision 13 4–32

All nodes on a given control bus have a unique address that must be defined.

<DESTINATION ID> - The Destination Identifier specifies the multidrop address of the

device(s) to which the message is sent.

<FRAME SEQUENCE NUMBER> - The FSN is a tag with a value from 0 through 255 that is

sent with each message. It assures sequential information framing and correct equipment

acknowledgment and data transfers.

<OPCODE> - The Operation Code field contains a number that identifies the message type

associated with the data that follows it. Acknowledgment and error codes are returned in this

field. This field is 2 Bytes for the DM240 protocol.

<...DATA...> - The Data field contains the binary, data bytes associated with the

<OPCODE>. The number of data bytes in this field is indicated by the <BYTE COUNT> value.

<CHECKSUM> - The checksum is the modulo 256 sum of all preceding message bytes,

excluding the <SYN> character. The checksum determines the presence or absence of errors

within the message. In a message block with the following parameters, the checksum is

computed as shown below in Table 4-4.

IMPORTANT

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Radyne DM240XR Especificações Página 54