User Manual

Table Of Contents
Appendix 179
Mailbox Command References
WAGO-I/O-SYSTEM 750
I/O Modules
6.3.6.4 Read Connection Quality (GetLinkQuality, 0xD5)
Connection quality ("Link Quality" LQ) returns the bit error rate of the wire-
less connection. The conversion of an LQ value to the current bit error rate
can take place with the following characteristics:
Bit error rate
Connection quality
Figure 42: Connection between connection quality and bit error rate as well as LED signaling
g064468x
The connection quality (see bars over the table) is indicated by LEDs:
Green:. indicates a low bit error rate of < 10
-3
Yellow: indicates a bit error rate ranging from 10
-2
to 10
-3
Red:. .. indicates a bad transmission channel with a bit error rate of < 10
-2
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_GETLINKQUALITY
1 T -
2 MBX_TARGET_TABLE_AND_INDEX