Profichip VPC3+S - Page 61

PROFIBUS DP Extensions 7
VPC3+S User Manual
Revision 1.04
61
Copyright © profichip GmbH, 2012
Byte
Bit Position
Designation
7
6
5
4
3
2
1
0
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+S 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+S 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.