User guide
SAA CR Logger Integration Guide
May 2012 8
Figure 5.1: SAACR_FileGen utility.
Reading Interval: The frequency at which SAA observations are made within the program (also
known as ‘scan interval’). An SAAF can perform measurements at 400Hz (see above), thus taking
an average of 1000 samples (typical value) in less than 10 seconds. However, sufficient time
must be included to account for other commands and functions within the CR1000. The number
of SAAFs connected to a CR1000 also affects the collection time. Based on past experience, the
logger also needs time to process all of its commands and has been known to crash when the
reading interval was less than 10 minutes. For this reason, the minimum reading interval is 10
minutes.
SAA Table: For each SAA, the following information must be included, (as seen in Figure 5.1):
1. SAA232 or SAA232-5 Channel that the SAA is connected to (See Figure 5.2);
2. COM port to which the SAA232 or SAA232-5 is connected on the CR1000; and
3. Serial Number (physically marked on the ‘cable-end’ of the SAA)
Generate CR1/CR8 File: The main difference between the CR800 and CR1000 is the number of
COM ports available, and thus the number of SAAs that be connected to each. For a CR1000, up
to 20 SAAs can be connected at one time, but for a CR800 only 10 SAAs. (Please contact
Measurand or Campbell Scientific for more information on the differences between the two). To
choose the data logger, click the “Generate CR1/CR8 File” button, and select the desired file
type in the save screen (Figure 5.3). An SAA_Include file will also be generated at this time.
The SAACR_FileGen utility can be used to create programs for SAAs and SAAPs (Measurand vibrating
wire piezometers). Once the program is completed, it is possible to add coding for other instruments
into the program.