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Sending Explicit Messages Section 9-1
CIP UCMM MESSAGE SEND (28 10)
This command sends an explicit message for CIP routing to another node’s
specified class and receives a response. There are two command formats:
one with a specified route path (path to the target device), and the other with-
out the route path.
Command Block
• Relay Hop Format
The following format includes the route path (routing service data). Specify
the entire routing path in the command’s request path.
• Last Hop Format
The following format does not include the route path.
28 10
52
Command
code
Transport
ID
Message
monitoring
time
02 20 06 24 01
Service code
Unconnected Send service: 52 Hex
Request path size = 2 words: 02 Hex
Class ID Connection Manager: 06 Hex
8-bit class ID: 20 Hex
8-bit instance ID: 24 Hex
Instance ID: 01 Hex
Priority/Time Tick
Request path
(variable length)
Time Out Ticks
Request path size
Service code
Routing service data
Routing
service data
Route path size
Request data
(variable length)
Route path
(variable length)
Message
request size
Last hop
data
Routing
service data
00
Padding data
(when necessary)
Request path
502 bytes max.
502 bytes max.
Service code
Request path size
(variable length)
Request data
(variable length)
Request path size
2810 Hex
Command
code
Transport
ID
Message
monitoring time
502 bytes max.