Westermo FD-80 - Manual (Page 20)

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Word 15 High byte 8 7 Low byte 0
1 EN SDO – CNF RES – – – Transfer slave address, in range 1–64
2 Out word 1, high byte Out word 1, low byte
– – –
– – –
64 Out word 63, high byte Out word 63, low byte
7.2.2.1 Output data word
Data transmitted from Profibus DP master to FD-80. The first word is the added com-
mand word and the remaining 1 to 63 words are ordinary output data sent to the
addressed remote Fieldbus Adapter.
Output word 1 high byte (bit 15..8) is the serial transfer command byte, with following
content:
EN ENable the FD-80 (bit15).
This bit must always be set high (1) for normal operation.
When it is set FD-80 indicates data set ready by the EN
bit being set in the Input status word. The EN bit is only
set to low (0) to disable the FD-80.
SDO Send actual Data Once, toggle bit (bit 14).
When this toggle bit is changed, the data words are
taken from the DP data words and transmitted directly
over the serial transfer interface of the FD-80.
CNF CoNFiguration mode (bit 12).
For testing purpose only.
This bit is set low (0) during the normal operating mode
of the FD-80. This bit is set high (1) in order to switch
the FD-80 over from normal operating mode to configu-
ration mode.
RES RESet read back status, toggle bit (bit 11).
When this toggle bit is changed, it will reset read back
status ACK and TO also in all data words.
Output word 1 low byte (bit 7..0) is the serial transfer address, with the following con-
tent:
Transfer slave address of the Fieldbus Adapter to which this frame will be sent. Serial
transfer slave address, range is 1 to 64.
Output word 2 to 64 is the output data, with following content:
Word 1 High: Output byte 1 Low: Output byte 2
Word 2 High: Output byte 3 Low: Output byte 4
......... ......... ........
Word 63 High: Output byte 125 Low: Output byte 126.