84 Appendix
WAGO-I/O-SYSTEM 750
750-658 CAN Gateway
Manual
Version 1.2.1, valid from FW/HW-Version 01/01
12
Appendix
12.1 Mailbox 2.0 Transmission Method
Mailbox 2.0 defines a service to transfer data full-duplex via a defined channel.
Figure 47: Communication via Mailbox 2.0
Example:
A sender wants to transfer 10 bytes (the character string "Hello Wago") to a
receiver via a 4-byte wide channel.
12.1.1 Message
The Mailbox 2.0 method packages the data in messages. A message contains a
header and user data.
There are two message types.
Message with simple header:
xx "H" "a" "I" "I" "o" " " "W" "a" "g" "o"
Message with extended header:
xx
xx
xx "H" "a" "I" "I" "o" " " "W" "a" "g" "o"
Transparent
Communication
(via Mailbox
2.0)
Transmit data
Application A
Receive data
Receive data
Application B
Transmit data
Sender Channel Receiver
