Troubleshooting

All LEDs are permanently off

Cause

There is a problem with the supply voltage.

Solution

Verify 100-240 VAC.

If the problem persists, the product may be malfunctioning.

Red LED is permanently on

Cause

Error on the M-Bus 2-wire bus.

Solution

Verify no short-circuit of the M-Bus bus. The voltage of the bus should be between 21 VDC and 42 VDC.

Cannot read connected M-Bus slaves

Cause

Fault in M-Bus status

Solution

Verify M-Bus status:

Voltage over M-Bus slave device should be between 21 VDC and 42 VDC.
All M-Bus slave devices must have unique secondary or primary M-Bus addresses depending on addressing mode.
M-Bus slave device baud rates.

TX LED is permanently on

Cause

CMeX10 Series is stacked with other CMeX10 Series products and there is a short circuit on a product which is mounted on the left side of the issued product.

Solution

Verify left side mounted products for no short circuit.

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