Mailbox 2.0 Transmission Method; Message; Figure 24: Communication Via Mailbox 2.0 - WAGO SPEEDWAY 767 Series Manual

84 Appendix
Pos : 61 /All e Seri en (Allgemei ne Module)/M ailboxkommuni kation/Ü bertragungs verfahren M ailbox 2.0 @ 12\mod_1332927950573_21.doc x @ 92512 @ 233434555545 @ 1
12.2

Mailbox 2.0 Transmission Method

Mailbox 2.0 defines a service to transfer data full-duplex via a defined channel.
Sender
Transmit data
Application A
Receive data

Figure 24: 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.
12.2.1

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"
Message with extended header:
xx xx
Communication
(via Mailbox 2.0)
"I" "o"
xx "H" "a" "I"
767-5203 Serial Interface (RS-232, RS-422/-485)
Channel
Transparent
" " "W" "a" "g" "o"
"I" "o" " " "W" "a" "g" "o"
WAGO-SPEEDWAY 767
Receiver
Receive data
Application B
Transmit data
Manual
Version 1.1.0