GE VersaPoint IC220PBI002 User Manual page 148

8
Example 7, Example Read on VersaPoint RS-232 Communications
Module, Slot 3, Object 5FFF, Subindex 0 (additional example)
Read request (master -> slave) – start fragment
Data (4 Words VC1)
01 03 5F FF 00 I 00 00 00
Read response (slave -> master)
Data (4 Words VC1)
91 00 14 00 07 02 00 00
Read request (master -> slave) – acknowledgement of start fragment
Data (4 Words VC1)
91 xx xx xx xx xx xx xx
Read response (slave -> master)
Data (4 Words VC1)
A1 24 0D 0A 00 00 00 00
Read request (master -> slave) – acknowledgement of 1
Data (4 Words VC1)
A1 xx xx xx xx xx xx xx
Read response (slave -> master)
Data (4 Words VC1)
A2 11 13 00 00 00 00 00
Read request (master -> slave) – acknowledgement of 2nd continue fragment
Data (4 Words VC1)
A2 xx xx xx xx xx xx xx
Read response (slave -> master)
Data (4 Words VC1)
C0 00 I 00 00 00 00 00 00
Read request (master -> slave) – acknowledgement of end fragment
Data (4 Words VC1)
C0 xx xx xx xx xx xx xx
Clear request (master -> slave)
Data (4 Words VC1)
00 xx xx xx xx xx xx xx
Clear response (slave -> master)
Data (4 Words VC1)
00 00 00 00 00 00 00 00
8-28 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005
Data Structure
Read PCP/Slot/Index high/Index low/Subindex I 3 bytes
unused
Data Structure
Read response/Status/Actual length/5 bytes of object data
Data Structure
Read/7 bytes unused
Data Structure
Read response/7 bytes of object data
Data Structure
Read/7 bytes unused
Data Structure
Read response/7 bytes of object data
Data Structure
Read/7 bytes unused
Data Structure
Read/1 byte of object data I 6 bytes unused
Data Structure
Read/7 bytes unused
Data Structure
Clear
Data Structure
Clear response
st
continue fragment
GFK-1911B