WAGO-I/O-SYSTEM 750
Appendix
77
750-657 IO-Link Master
Manual
Version 1.0.2, valid from FW/HW-Version 02/01
11.1.1.2.1 The Handshake Byte
In general, a distinction is made between Control (C) and Toggle (T) mode (bit 7).
The Control mode is used to synchronize the subscribers. The Toggle mode is
used to exchange data.
Structure of the handshake byte:
Table 36: Structure of the handshake byte
Handshake byte
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Status
Control
Response
Command
C/T
T
0x0
C/T
T
0x0
The following figure shows the basic use of the handshake byte.
Up
s
tr
e
a
m
Do
w
n
s
tr
e
a
m
Status
Control
Status
Control
Status
Control
Status
Control
Handshake
Handshake
Sender
Handshake
Handshake
Sender
Control
IO-Link master
Create
response
Create
response
Create
request
Receiver
Receiver
Create
request
Figure 29: Use of the handshake byte