Troubleshooting
35 (46)
Meters are detected but have no data
Some meters may contain a wrong declaration of the secondary address. These meters will be
visible in the meter list but not addressable for meter readouts.
The system parameter
MBUS_SELECTMASK
makes it possible to mask parts of the secondary
address and replace them with a wildcard character. The version field especially is a frequent
cause of this problem (
MBUS_SELECTMASK=4
). See
Configuration Files, p. 39
.
Scanning takes too long
Under certain circumstances, scanning the M-Bus may take an extremely long time (an hour or
more).
1.
Try searching for meters gradually by limiting the address space (
Primary start address
)
or by using a search mask (
Secondary address mask
).
2.
Decrease the system parameter
MBUS_MAXRETRY
from the default value.
See
Configuration Files, p. 39
.
Meters that do not respond to a request will then not add excessively to the total scan time.
3.
Select a different scan mode, either on the Configuration tab or by setting the system
parameter
MBUS_SCANMODE
.
Reversed secondary scan (
SECONDARYSCANREVERSE
) is often particularly useful to
speed up scanning of the M-Bus.
Gateway restarts occasionally during scan
The gateway is equipped with an internal watchdog to prevent denial of service (DoS). If a scan
takes a very long time, the watchdog may reboot the gateway.
Under certain circumstances there can be lots of collisions on the M-Bus, for example if all
meters are responding at the same time. These collisions and the resulting high current draw of
the M-Bus slaves can in exceptional cases trigger a reboot of the gateway.
1.
If the scan usually takes a very long time (due to a large number of connected meters or a
slow connection) it may be necessary to increase the value of the system parameter
WATCHDOG_SCAN
to prevent the watchdog from rebooting the gateway unnecessarily.
See
Configuration Files, p. 39
.
2.
Try searching for meters gradually by limiting the address space (
Primary start address
)
or by using a search mask (
Secondary address mask
).
3.
If possible, try to split the bus and scan each bus segment separately.
M-Bus to Modbus-TCP Gateway User Manual
SCM-1202-0096-EN 2.1
