GE VersaPoint IC220PBI002, User Manual

Page: 148 / 202

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