mDT001 HazMon System Tester Technical Manual /10
CMC INDUSTRIAL ELECTRONICS LTD
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3.3 Bus Test
*********************************************** Warning *************************************************
Do not connect the tester to the network until the tester is turned on and
“Bus Test”
is selected. If the
tester is not powered, it will cause the network to fault.
************************************************************************************************************
The “
Bus Test
” reports the health of a CMC network. Common network faults such as a partially
shorted data bus or open data bus are detected. The tester also displays the number of sensors being
polled by the bus converter and the serial numbers of the sensors being polled.
************************************************ Caution *************************************************
The tester displays the sensors that are being polled by the bus converter. This display does not
indicate that those sensors are present on the network or responding to the poll request, only that
they are present in the bus converters polling list. Individual sensors should be verified using the
“
Sensor Test
”.
************************************************************************************************************
If “
Bus Test
” is selected and the tester is not connected to the network using the supplied patch
cable, the display will indicate:
When the tester is connected to a powered network, one of the following messages will be displayed:
Message
Description
Bus Good
No errors were detected on the bus
Please Wait
Wait while information is being collected
Power Volts Low
The network DC power is below 4.00VDC
Data Volts Low
The network data line DC level is below 3.90VDC
Data Stuck Low
The
network data line level is stuck in the low state
Data Stuck High
The network data line level is stuck in the high state
The “
UP
” and “
DOWN
” keys can be used to display further information about the network’s
performance. The following table describes the available display starting from the status display
described above:
Bus Test
Power Volts Low
