CAN-8124/CAN-8224/CAN-8424 User Manual
CAN-8124/ CAN-8224/ CAN-8424 User Manual (Version 2.0, Aug/2007)
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7.2.2 How to apply the Poll IO connection
Poll Command and Response message move any amount of I/O data
between a Master and its Polled Slaves. This example is revealed how to
apply the Poll IO connection in the DeviceNet application.
Note: CAN-8x24: Node ID=0x09, Master node ID=0x0A
The figure below shows the Poll I/O connection Identifier Fields.
IDENTIFIER BITS
10 9 8 7 6 5 4 3 2 1
0
IDENTITY USAGE
HEX
RANGE
1 0
Destination MAC ID
1 0 1
Master’s I/O Poll Command/Change of State/Cyclic
Message
1 0
Source MAC ID
0 1 1
Slave’s Explicit/ Unconnected Response Messages
1 0
Destination MAC ID
1 1 0
Group 2 Only Unconnected Explicit Request
Messages
1 0
Destination MAC ID
1 0 0
Master’s Explicit Request Messages
0 1 1 1 1
Source MAC ID
Slave’s I/O Poll Response Message
1. Requests the use of the Predefined Master/Slave Connection set
Master
(MAC
ID
=0x0A)
Slave
(MAC
ID
=0x09)
_ Group 2 Message
| _ Destination MAC ID=0x09
| | _ Message ID =6
| | | _ Frag=0. Transaction ID=0. Souce MAC ID= 0x0A
| | | | _ Service=Allocate_Master/Slave_Connection_Set Request
| | | | | _ Class ID=3
| | | | | | _ Instance ID=1
| | | | | | | _ Allocation Choice=Explicit, Polled & Bit Strobed
| | | | | | | | _ Allocator’s MAC ID=0x0A
ID=10 001001 110. Data= 0A 4B 03 01 07 0A
_ Group 2 Message
| _ Source MAC ID=0x09
| | _ Message ID =3
| | | _ Frag=0. Transaction ID=0. Souce MAC ID= 0x0A
| | | | _ Service=Allocate_Master/Slave_Connection_Set Response
| | | | | _Connection Message Body Format = DeviceNet (8/8)
| | | | | |
| | | | | |
| | | | | |
ID=10 001001 011. Data= 0A CB 00