mDT001 HazMon System Tester Technical Manual /12
CMC INDUSTRIAL ELECTRONICS LTD
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The Industry Leader in HazMon Technology
3.3 Bus Test
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 EZTester is able to measure
insulation resistance between data line and ground wires. 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 4.00 VDC
Data Volts Low
The network data line DC level is below 3.90 VDC
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:
Key
Function
Description
Down 1
No. of Sensors
The number of sensors being polled by the bus
converter is displayed
Bus Test
Power Volts Low
