User Manual

Table Of Contents
Appendix 161
Mailbox Command References
WAGO-I/O-SYSTEM 750
I/O Modules
6.3.5.32 Set the QoS Settings (SetConnectionQoS, 0x89)
This command assigns the settings of the Quality-of-Service (QoS) for a con-
nection. The settings do not take effect until the module is switched over to
master mode.
Note
The master can connect to a maximum of 3 slaves with activated QoS. QoS
can only be set for WAGO devices. It improves latency by reducing devia-
tions (outliers).
Since the Bluetooth
®
subsystem of the Bluetooth
®
module has already been
optimized for maximum performance, the influence on time behavior in the
real-time profile is marginal. Therefore, it is recommended that you keep the
factory setting MBX_BQM_NONE.
Conditions
Mailbox size Operating mode/profile Device role
6 12 18 Config.
Real-
time
Ad hoc Master Slave
Save
config.
Restart
- - - -
Request
Byte 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
0 MBX_SETCONNECTIONQOS
1 T -
2 MBX_TARGET_TABLE_AND_INDEX
3 MBX_QOS_SETTINGS
Arguments
Parameter Value Description
Bit 0…3 Table index
Index 0...6 for WAGO devices of slots 1...7
MBX_TARGET_
TABLE_AND_
INDEX
Bit 4…7 Target table
"2" for WAGO_DEVICE (slots 1...7)
MBX_BQM_NONE
(0x01)
No QoS activated (standard)
MBX_BQM_BEST_
EFFORT (0x02)
QoS is active in the "Best Effort" mode
MBX_QOS_
SETTINGS
MBX_BQM_
GUARANTEED (0x03)
QoS is active in the "Guaranteed" mode