I-7242D user manual
I-7242D DeviceNet/Modbus RTU Gateway User’s Manual, July 2006, Version 1.1 103/124
4. Apply the Master’s Explicit Request Messages to set the User-defined
Modbus command object instance attribute 0x04.
Set 0x04 attribute with a non-zero value.
Master
(MAC
ID
=0x0A)
Slave
(MAC
ID
=0x09)
After setting the 0x04 attribute with a non-zero value, this user-defined
message will be sent to the Modbus device.
_ Group 2 Message
| _ Destination MAC ID=0x09
| | _ Message ID =4
| | | _ Frag=0. Transaction ID=0. Destination MAC ID= 0x0A
| | | | _ Service=Set Attribute Request
| | | | | _ Class ID=0x65
| | | | | | _ Instance ID=0x01
| | | | | | | _ Attribute ID=0x04
| | | | | | | | _
Attribute Data= 0x01 – Non-zero value
ID=10 001001 100. Data= 0A 10
65
01
04
01
_ Group 2 Message
| _ Source MAC ID=0x09
| | _ Message ID =3
| | | _ Frag=0. Transaction ID=0. Destination MAC ID= 0x0A
| | | | _ Service= Set Attribute Response
| | | | |
| | | | |
ID=10 000011 011. Data= 0A 90