PROFIBUS DP-Master

The Application Interface 245/315
6.3.5 PROFIBUS_DL_CMD_DATA_ACK_IND - Receive SDA Service
This indication is transferred from the remote FDL controller to the local host, when an SDA (Send
Data with Acknowledge) frame has been received from an initiator on the Profibus network. The
reception of the indication message needs no acknowledgment message to the local FDL.
The data of the message is contained in the Service Data Unit, represented by the field abSDU[]. The
length of the Service Data Unit is limited to at most 246 bytes
Packet Structure Reference
typedef struct PROFIBUS_DL_DATA_ACK_IND_Ttag {
TLR_UINT8 bSrvCls; /* Service Class */
TLR_UINT8 bDstAddr; /* Destination address */
TLR_UINT8 bDstSAPIdx; /* Destination Service Access Point */
TLR_UINT8 bSrcAddr; /* Source address */
TLR_UINT8 bSrcSAPIdx; /* Source Service Access Point */
TLR_UINT8 abPad[3]; /* Padding needed to bring SDU to a DWORD boundary and to
right position */
TLR_UINT8 abSDU[PROFIBUS_DL_MAX_DLPDU_SIZE]; /* Service Data Unit */
} PROFIBUS_DL_DATA_ACK_IND_T;
#define PROFIBUS_DL_DATA_ACK_IND_SIZE (sizeof(PROFIBUS_DL_DATA_ACK_IND_T)-
PROFIBUS_DL_MAX_DLPDU_SIZE)
/* Indication Packet for acknowledged connectionless data transfer */
typedef struct PROFIBUS_DL_PACKET_DATA_ACK_IND_Ttag {
TLR_PACKET_HEADER_T tHead;
PROFIBUS_DL_DATA_ACK_IND_T tData;
} PROFIBUS_DL_PACKET_DATA_ACK_IND_T;
PROFIBUS DP-Master |
DOC061001API12EN | Revision 12 | English | 2010-12 | Released | Public © Hilscher, 2006-2010