AR 10013164, Operating And Service Manual

Page: 37 / 54

FL7006/FL7030/FL7218/FL7040/FL7060Kit
Rev J 25
If a command is of a type that does not require the probe kit to return any data, the probe responds as above,
but with no data field.
If a recognizable error occurs, the probe kit responds with an error code, as detailed in 3.7.1.2.
Commands to the probe kit must be sent one command at a time. Before sending another command, the host
must wait for receipt of a complete response string (including the termination character(s)) from a prior
command. Sending a command before receiving a response string will typically result in the new command
being totally ignored. However, it may result in Error Code Responses.
To accommodate unrecognized errors, the host should have a timeout provision and an application program to
take appropriate action in the event that there is no response within a certain time period after sending the
command. It is recommended that the time period be on the order of one second.
Command To Probe Kit Response From Probe Kit
Read Probe Data
D<CR> Probe kit response structure: <start character><command letter><x
axis field value ><y axis field value>< z axis field value><composite
field value><status flag><termination>
:D<x><y><z><c><s><termination>
Where x, y, z, are 4 digit axis values, plus one floating decimal point
after the 2
nd
or 3
rd
digit (in implied units of Volts/meter), c is the
composite field value plus one floating decimal point after the 2
nd
or
3
rd
digit (in implied units of Volts/meter), and s is a status flag (S or
X), where S indicates status is OK, X indicates status is not OK. (See
NOTE 1.)
Described in more detail:
: = Start character ASCII colon (1 character)
D = Command identifier (1 character)
x = X axis field 4 digit value with ASCII decimal point (5 characters)
y = Y axis field 4 digit value with ASCII decimal point (5 characters)
z = Z axis field 4 digit value with ASCII decimal point (5 characters)
c = Composite field 4 digit value with ASCII decimal point (5
characters)
s = Status flag (S or X) (1 character)
termination = Depends on the selected response termination
characters (see TERM command for details) (1 or 2 characters)
Character field separators are not used.
NOTE 1: The returned status flag of S or X is determined by sampling
the raw voltage on the output of the device used to convert the laser
light into electrical power. An S is returned when this voltage is at or
above a predetermined threshold level. An X is returned when this
voltage is below the same predetermined threshold level. This
threshold level has been selected based on statistical analysis of data
collected during the design phase of the product series. An X indicates
that the voltage has dropped to a level where there is the possibility of
inaccurate data being generated. Monitoring of the status flag is
recommended to ensure accurate data collection. The most common
cause of a drop in this voltage level is dirt on the ends of the fiber-
optic cable carrying the laser light.