4.3811.00.000_US-Anemometer-DSP_eng.doc
13 - 26
021511/10/06
7.1.2 Return values of ULTRASONIC
After a valid command has been input, the ULTRASONIC sends acknowledgement, e.g.
acceptance of the parameter or output of a data telegram.
For a standard command the response starts with a '!', followed by the ID and the parameter value.
If the input command is TR or TT, the ULTRASONIC transmits a data telegram as the response.
If the command cannot be processed for a certain reason, the device transmits a telegram with the
error code 'CE' (Command Error). The meanings of the values for CE are summarised in Table 1:
Return values with incorrect interpretation of command:
Value output in CE telegram
Meaning
8
Incorrect access key
16
Parameter not in valid range
4 or 32
Violation regarding parameters of other commands
Table 1: Return values with incorrect interpretation of command
7.1.3 Access mode
For configuration the ULTRASONIC has a set of commands which determine behaviour in terms of
the propagation time. The commands are broken down into three levels:
•
interrogation mode
•
user mode
•
configuration mode
Interrogation mode:
This mode includes commands which do not influence the parameters of the ULTRASONIC. They
include for example output of the system status and interrogation of the data telegram TR.
User mode:
This mode includes commands which alter the behaviour of the ULTRASONIC. These parameters
can be changed by the user. The system behaviour of the device is altered with these commands.
This group of commands includes e.g. settings for data transmission and averaging.
Configuration mode:
This mode includes commands which were set when adjustment of the device was performed at
the factory. They can be equated with calibration. These parameters must not be changed.
To distinguish between commands of the three groups when parameterising the ULTRASONIC the
device is equipped with an access key KY. Inputting of this key accesses the individual levels.
Access to commands at a higher level includes access to commands at a lower level.
Access key
Response from ULTRASONIC
Command level
00KY00000 WRITE
PROTECTED
!00KY00000
Interrogation mode (preset)
00KY00001 USER
ACCESS
!00KY00001
User mode
00KY00234 CONFIG
ACCESS
!00KY00234
Configuration mode
Table 2: Access key for different command levels
