Campbell SAT ARGOS Manual de usuario Pagina 229

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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 221
The time that is required by each sensor to make a measurement must be
taken into account for the ZENO
®
-3200 to measure each sensor properly
when the sensors share a common resource.
The following is a list of the single resources on the ZENO
®
-3200 that will be shared when more than one
Sensor Record uses it.
256
Potentially Shared Resource Details Time Critical
12-bit ADC
There is a single 12-bit ADC multiplexed
between several channels. Each 12-bit ADC
measurement requires only 0.1 milliseconds, so
sharing this resource is not that critical.
No
18-bit ADC
There is a single 18-bit ADC multiplexed
between several channels. Each 18-bit ADC
measurement requires 100 milliseconds. When
more than one 18-bit ADC sensor is specified,
the time for each 18-bit ADC MUST be taken
into account in the configuration.
Yes
COM1
COM1 is not multiplexed, nor does it support
multi-drop serial communication. This resource
cannot be shared by more than one Sensor
Record.
N/A
COM2
COM2 is fully multiplexed to provide four
separate links. One link is RS485, which
supports multi-drop serial communication. More
than one Sensor Record can share this resource.
Yes
COM3
COM3 is not multiplexed, but it does support
RS485 for multi-drop serial communications.
More than one Sensor Record can share this
resource if the port type is always RS485.
Yes
If all Sensor Records are to be read equally, use the following steps when you configure more than one
Sensor Record that uses the same resource:
Make a list of all the Sensor Records that use a commonly shared resource.
Add the time required for measurement (t
i
) required by each of the listed Sensor Records to calculate
the total time required to read each sensor at least once (T
Once
). If a Sensor Record defines an analog
sensor or a digital sensor, the time required for measurement must include any extra readings if the
Sample Count is greater than one. The Sample Count is defined by Line Item #10 in the Sensor
Menu (refer to Section 10.3.9).
256
Refer to Section 2.5 for the functional block-diagram of the ZENO
®
-3200 that illustrates these resources.
n
n
i
iOnce
ttttT
1
21
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