Burkert Type 8644 - Manual (Page 60)

56 - 8644/phoenix
S
YSTEM
D
ESCRIPTION
Byte 1 - Service in the start fragment:
Bit 7 Request/Response
0=Request
1=Response
Bit 6:5 fragment type
00= Start fragment
Bit 4 fragmentation
0= not fragmented
1= fragmented
Bit 3:0 Service
Hex Value: 0x00: no action
0x01: Read-PCP
0x02: Write-PCP
0x03: Read
0x04: Write
0x05: Read PDU length
0x06-0x0F: Reserved
• Continuation fragment
Byte 1: Service
Byte 2: Data block, if required
…
Byte n: Data block, if required
Byte 1 - Service in the continuation fragment:
Bit 7 Request/Response
0 = Request
1 = Response
Bit 6:5 fragment type
01= continuation fragment
Bit 4:0 counter
=1–0x1F Fragment number;
if more fragments are required, 0 can be continued with after 1F
• Conclusion fragment
Byte 1: Service
Byte 2: Data block, if required
…
Byte n: Data block, if required
Byte 1 - Service in the conclusion fragment:
Bit 7 Request/Response
0 = Request
1 = Response
Bit 6:5 fragment type
10= Last fragment
Bit 4:0 reserved