WAGO I/O-SYSTEM 750 Manual page 28

28 • I/O Modules
Special Modules
Table 9: Configuration of the Bluetooth
Channel name
CHANNEL_SELECT
STATUS_FLAGS
STATUS_DATA_SIZE
DATA[1]
...
DATA[n] (=cutoff)
This header is automatically added in WAGO (see Figure 7).
WAGO
Header is added and removed automatically
Header is added
automatically
Control/status byte
are not transmitted
Local data
Control/status byte
are added
Header is removed
automatically
Figure 7: Adding the header in data packets of external devices
Note
Missing data in the protocol header may lead to termination of the connec-
tion. Therefore, prepend the 3-byte channel information (0x01 and 0x00 and
field length) to the data to be transferred if you would like to send from an
external device to a WAGO device.
WAGO devices add the header automatically.
Length
in bytes
1
1
1
1
...
1
®
Bluetooth
Device
Cutoff
01 00 Data
length
Data
C/S int Data
Data
Cutoff
01 00 Data
length
®
Packet
Value Description
0000 0001 Virtual channel selection, always 0x01
(0x01)
0000 0000 Status bits, always 0x00 for external devices
(0x00)
xxxx xxxx Data length in bytes, according to "cutoff"
(see Section 2.1.1.8.1.2)
xxxx xxxx 1st byte of process data
xxxx xxxx ...
xxxx xxxx nth (last) byte of process data
External
Header must be added and removed from the device
Radio transmission
Header is removed
from the device
Local data
Header must be
created from the device
Radio transmission
®
Bluetooth
Device
Cutoff
01 00 Data
length
Data
Cutoff
01 00 Data
length
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WAGO-I/O-SYSTEM 750
I/O Modules