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Format of TopWare user-defined packet

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Offset Size Description

00h

BYTE

FFh

01h

WORD

(call) length of data field plus 3
(ret)  length of received message (0000h if none received)

03h

BYTE

destination ID (FFh for broadcast message)

04h

BYTE

sending station ID

05h

BYTE

type code (11h; all other codes reserved for TopWare)

06h

N BYTEs

received message