Instructions

Troubleshooting 31

Anybus M-Bus to Modbus-TCP Gateway User Manual Doc: HMSI-27-300, Rev: 1.10

6.3 Meter reading errors

6.3.1 No meters are detected

A scan has been completed but none of the connected meters appear in the meter list.

1. Check the cable between the gateway and the meter and replace faulty cables.

2. Check that the M-Bus connection voltage is approximately 36 VDC measured between terminals

“MBUS+” and “MBUS-”.

3. Check that the M-Bus interface (M-Bus mode) is enabled in the

Configuration tab

(see 3.1.3

Configuration tab).

4. Check that the connected meters support configured search mode (primary or secondary).

5. Try searching for meters gradually by limiting the address space (

Primary start address) or by

using a search mask (

Secondary address mask).

6. Try different settings of

M-Bus request mode and M-Bus reset mode.

7. Try a different

M-Bus baud rate (300, 2400 or 9600), or a higher M-Bus timeout value.

8. If possible, disconnect the meters one by one to eliminate a possible source of error.

9. Connect another M-Bus meter (if available) and repeat the communication test with this meter

in order to locate the source of error.

10. Increase the system parameter MBUS_MAXRETRY from the default value.

Meters that do not respond to every request will be found easier by increasing the number of

retries the gateway makes. See 7.4.1

System configuration file.

6.3.2 Some meters are not detected

A scan has been completed but some of the connected meters do not appear in the meter list.

1. Perform the scan both as a primary scan and a secondary scan, as not every meter supports both

methods. See 3.1.3

Configuration tab.

2. Try search masks or limiting the address space to perform a gradual scan of the M-Bus.