Profichip VPC3+C - Page 55

PROFIBUS DP Extensions 7
Bit Position
Byte
7 6 5 4 3 2 1 0
Designation
0
Response _Sent
SAP_Number SAP_Number
1 Request_SA
2 Request_SSAP
3 Service_Supported
4 Ind_Buf_Ptr[0]
5 Ind_Buf_Ptr[1]
6 Resp_Buf_Ptr
SAP-List entry:
Byte 0
Response_Sent: Response-Buffer sent
0 = no Response sent
1 = Response sent
SAP_Number: 0 – 51
Byte 1
Request_SA: The source address of a request is compared with this value. At
differences, the VPC3+C response with “no service activated” (RS). The default
value for this entry is 7FH.
Byte 2
Request_SSAP: The source SAP of a request is compared with this value. At
differences, the VPC3+C response with “no service activated” (RS). The default
value for this entry is 7FH.
Byte 3
Service_Supported: Indicates the permitted FDL service.
00 = all FDL services allowed
Byte 4
Ind_Buf_Ptr[0]: pointer to Indication-Buffer 0
Byte 5
Ind_Buf_Ptr[1]: pointer to Indication-Buffer 1
Byte 6
Resp_Buf_Ptr: pointer to Response-Buffer
Figure 7-3: SAP-List entry
In addition an Indication- and Response-Buffer are needed. Each buffer
consists of a 4-byte header for the buffer management and a data block of
configurable length.
VPC3+C User Manual
Revision 1.03 55
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