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9.2 Communication Structure
When a connected device sends a message to an E71 in the MC protocol message format, the E71 performs the
process according to the message. During communications, a CPU module including the E71 operates as a server,
and the connected device (a personal computer or other terminals) operates as a client. Based on the command
message received from the client, the server (the E71) automatically sends an appropriate response message.
The frames that can be used with an E71 are as follows.
•4E frame
• QnA-compatible 3E frame
• A-compatible 1E frame
Connected device
Ethernet
E71
Server
Client
Header
Text (command)
Command message
Application data
Subheader
Header
Text (command)
Response message
Application data
Subheader
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