Campbell Scientific CR510 Basic Datalogger - Manual (Page 52)

SECTION 3. INSTRUCTION SET BASICS
3-4
TABLE 3.7-2. Example of the Use of Flag 9
1: If time is (P92)
1: 0 Minutes (Seconds --) into a
2: 10 Interval (same units as above)
3: 10 Set Ouptut Flag High (Flag 0)
2: If (X !F) (P89)
1: 14 X Loc [ Wind_spd ]
2: 4 <
3: 4.5 F
4: 19 Set Intermed. Proc. Disable Flag High (Flag 9)
3: Histogram (P75) ; See Section 11 for details of this intruction.
4: Do (P86) ; Required when additional output processing follows
1: 29 Set Intermed. Proc. Disable Flag Low (Flag 9)
5: Maximum (P73)
1: 1 Reps
2: 00 Time Option
3: 14 Loc [ Wind_spd ]
As an example, suppose it is desired to obtain a
wind speed rose incorporating only wind speeds
greater than or equal to 4.5 m/s. The wind
speed rose is computed using the Histogram
Instruction 75, and wind speed is stored in input
location 14, in m/s. Instruction 89 is placed just
before Instruction 75 and is used to set Flag 9
high if the wind speed is less than 4.5 m/s:
NOTE: Flag 9 is automatically reset the
same as Flag 0. If the intermediate
processing disable flag is already set high
and the test condition of a subsequent
Program Control Instruction acting on Flag
9 fails, the flag is set low. This feature
eliminates having to enter another
instruction to specifically reset Flag 9 low
before proceeding to another group of test
conditions.
3.7.3 USER FLAGS
Flags 1-8 are not dedicated to a specific
purpose and are available to the user for
general programming needs. The user flags
can be manually toggled from the keyboard in
the
∗
6 Mode (Section 1.3). By inserting the flag
test (Instruction 91) at appropriate points in the
program, the user can use the
∗
6 Mode to
manually direct program execution.
3.8 PROGRAM CONTROL LOGICAL
CONSTRUCTIONS
Most of the Program Control Instructions have a
command code parameter which is used to
specify the action to be taken if the condition
tested in the instruction is true. Table 3.8-1 lists
these codes.
TABLE 3.8-1. Command Codes
0 Go to end of program table 2
1-9, 79-99 Call Subroutine 1-9, 79-99 1
10-19 Set Flag 0-9 high
20-29 Set Flag 0-9 low
30 Then Do
31 Exit loop if true
32 Exit loop if false
41 Set Port 1 high
51 Set Port 1 low
61 Toggle Port 1
71 Pulse Port 1
1 98 is a special subroutine which can be
called by Control port 2 going high; see
Instruction 85 for details (Section 12).
2 If this command is executed while in a
subroutine, execution jumps directly to the
end of the table that called the subroutine.