User Manual

Table Of Contents
28 I/O Modules
Special Modules
WAGO-I/O-SYSTEM 750
I/O Modules
Table 9: Configuration of the Bluetooth
®
Packet
Channel name Length
in bytes
Value Description
CHANNEL_SELECT 1 0000 0001
(0x01)
Virtual channel selection, always 0x01
STATUS_FLAGS 1 0000 0000
(0x00)
Status bits, always 0x00 for external devices
STATUS_DATA_SIZE 1 xxxx xxxx Data length in bytes, according to "cutoff"
(see Section
2.1.1.8.1.2)
DATA[1] 1 xxxx xxxx 1st byte of process data
... ... xxxx xxxx ...
DATA[n] (=cutoff) 1 xxxx xxxx nth (last) byte of process data
This header is automatically added in WAGO (see Figure 7).
Bluetooth
®
Bluetooth
®
WAGO Device
Header is added and removed automatically
Data
External Device
Radio transmission
Radio transmission
01 00 Data
Cutoff
length
01 00 Data
Local data
Header must be
created from the device
01 00 Data
Cutoff
length
Data
Data
C/S int Data
01 00 Data
Control/status byte
are not transmitted
Header is added
automatically
Control/status byte
are added
Header is removed
automatically
Header is removed
from the device
Local data
Header must be added and removed from the device
Cutoff
length
Cutoff
length
Figure 7: Adding the header in data packets of external devices g064406e
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.