Chapter 6 Diagnostics
MAN_105G_1.5 Page 80
c) - Show Signal Strength
These options allow measurement of radio path between two locations. This is done by the
display of the received radio signal strength at one location (select “c”). With no transmitted
signal from the other site, the display will show the strength of the radio noise - normally this
is in the range between -100 and -130 dBm. At the other site, the transmitter may be turned
on (select “e” at the other 105G, or “Tone Reversals” if the other module is a 105U). The
display will now show the received radio signal from the other transmitter. For reliable
operation, the average signal strength should be better than –95dBm (that is, -90dBm, not –
100dBm) provided the average background noise is less than –105dBm (between –105 and –
130 dBm). If the average noise is greater than –105, the difference between the noise level
and the transmitter signal should be at least 10dB for reliable operation. For example, if the
average noise level is -101dBm, then a transmitter signal of better than -91dBm is required
for reliable operation.
Note the RSSI (received signal strength) of a received message is also stored in the database
registers - refer to section 2.5.1
e) Tone Reversals
If you select this option, the module will continuously transmit - you can use this feature for
radio tests. Note that if you are powering the module from a battery only, the battery will be
discharged quickly.
x) Exit
After you have finished doing the radio measurements, restart the module by selecting x).
The module will restart via its normal power-up and initialisation sequence. Select “Stop
Terminal” to shut down the terminal screen.
6.2.2 Online Diagnostics
To access the online diagnostics when connected to Terminal diagnostics display
First select “Diagnostics” to get the Terminal screen as per the previous section, and
select “Terminal”;
Then press “Enter” on your keyboard to access the menu.
A menu like the following will appear on the PC screen for the all models, however
Modbus/DF1 model will not have options h) through k).
If the module is in the Offline Diagnostics State then you may need to exit this menu by
pressing (x), wait for it to finish Initialising. then Press ‘Enter’
The on-line diagnostics menu is called the “Debug” menu.
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