Detecting and removing errors
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9 Detecting and removing errors
If your wireless system does not function properly, proceed as follows:
• First, make sure that a good wireless signal is available (1 green bar graph LED or RSSI
voltage ≥1.5 V).
• Check the status of the individual stations:
– If the PSI-CONF software is installed, check the device status of all network devic-
es via online diagnostics.
– If the PSI-CONF software has not been installed, check the bar graph LEDs on the
front of each device.
• Find the error using the tables from page 152 onwards.
Strength of the receive signal
You can determine the strength of the receive signal by means of the RSSI voltage. The sig-
nal strength is displayed on the LED bar graph on the wireless module.
– In a point-to-point connection, the LED bar graph is active on the master and on the
repeater/slave.
– In a wireless network with more than one repeater/slave, only the yellow LED on the
master is permanently on. The signal strength in the master direction is indicated on the
repeaters/slaves. The signal strength always relates to the directly connected, overlap-
ping wireless module.
The RSSI indicator is a voltage output in the range from 0 V DC ... 3 V DC. The higher the
voltage, the better the wireless connection. The measured voltage is directly related to the
receive signal in -dB. However, please observe the small voltage fluctuation due to mul-
tipath propagation.
The recommended minimum signal strength is 1.5 V DC. This results in a power reserve of
around 10 dB, which ensures communication even in unfavorable transmission conditions.
You can measure the RSSI voltage at the RSSI test socket or read it using the PSI-CONF
software. When connecting the master wireless module to a PC, you can read the RSSI volt-
ages on the entire wireless network. On a slave or repeater, it is only possible to read the
RSSI voltage of the connected wireless module.
– Avoid contact between the antennas of two wireless modules, otherwise the receiver
might become overloaded.
– Ground loops are caused by grounding of the antenna via the antenna fixing unit,
grounding of the power supply, or grounding of the serial interface. To avoid ground
loops, connect these components to a single ground point.
For more information on the RSSI voltage, please refer to Table 4-7 and Table 4-8.
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