A: There a several potential causes for this:

• Check that the cable distance and type between the monitor and gate is within spec.
• Check that the gate/door station and monitor are powered separately for cable distances of more than 10 metres.
• Check that the gate/door station microphone sensitivity is at minimum, and the speaker in the gate/door station is turned below 1/3rd volume, and that the monitor speaker volume is at 1/3rd and try again.
• Check cable cores are not mixed up.
• Try trimming and re-stripping the cable end in case of a break. Use a multi-meter on Bell mode to check breaks.
• If using additional monitors, try it with only one monitor connected first.
• Test the gate/door station and the monitor on a test bench or workshop, or inside the house on shorter cable run (note feedback may prevent sound in one for both directions unless devices are in separate rooms).

A: The cable type is not ideal, or too long. Try doubling up the cores on the audio wires to see if that helps. If not you may need to consider upgrading the cable.

A: Check that the first connected monitor is setup as a MASTER monitor, and that subsequent monitors are configured as SLAVE devices in the onscreen menu.

A: Check that the cable is proper twisted pair cable, and that it is within spec of this manual. If in doubt, remove either the monitor or gate/door station, and bring to the other side, and test on a few metres of CAT5. If it works then it is likely the cable is the problem. If it does not work, check the wiring connections again and contact technical support.

A: This is usually caused by improper cable being used.

• Check that the monitor and the gate/door station have power supplies connected with proper power cable and within the specified distance. Poor power cable can cause transmission problems.
• Upgrade the cable to a shielded CAT5 and connect the shield as shown in the wiring diagram.

A: Check the relay is closing with a multi - meter on bell mode. If the relay changes state, then check wiring and ensure the keypad is connected to the gate system or lock as well as the communication part of the gate/door station (connect in parallel for gates or strike lock, series for magnetic door lock). If the relay does not change state when a code is entered, then the problem is most commonly cause by the keypad not getting enough current draw on the power cable being used. Check the power cable is within spec.