Campbell Scientific CS475, CS476, and CS477 Radar Water Level Sensor - Manual (Page 30)

CS475, CS476, and CS477 Radar Water Level Sensor
• Stage—the water level as measured in meters or feet. This measurement is
calculated using the Water Stage Setting and the Units setting.
• Distance—the distance between the sensor and water surface. This value
will be reported in either meters or feet, depending on the Units setting.
• Diagnostic Values—an error code. For example, Code 0 = OK, Code 13 =
error E013 (see Section 8.2, Diagnostics and Repair).
TABLE 8-1. Example of Start Measurement Command
Initial Command Response
0M!
Where zero is the
sensor address. 00023<cr><If>
Where (from left to right),
0—sensor’s address;
002—the amount of time (in seconds) that you must
wait before sending the send data command;
3—the number of values that will be placed in the
buffer.
Subsequent
Command Response
0D0!
Where the first zero is
the sensor address. 0+100.050+25.000+0<cr><If>
Where (from left to right),
0—sensor’s address;
100.050—the stage in meters or feet;
25.000—the distance in meters or feet;
0—error code.
8.1.2 Check Unit Response
The Acknowledge Active command is used to check the presence of the sensor
on the bus (see TABLE 8-2).
TABLE 8-2. Acknowledge Active Command
Initial Command Response
a! a<cr><If!>
Only the address is sent back in response.
8.1.3 Check for Valid Data
The aI! command gets the following identification information in response to
sending aI! (see TABLE 8-3).
• Compatibility level: Version of SDI-12 protocol version; for example, 1.3.
• Manufacturer’s Name: VEGA
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