Campbell Scientific CR23X Micrologger - Manual (Page 150)

SECTION 9. INPUT/OUTPUT INSTRUCTIONS
9-16
3 - CS I/O port
76,800 baud to
SM192/716
5 - CS I/O port
38.4 K
6 - RS-232 port
38.4 K
D Measurement
0 - Differential
measurement
1 - Single-ended
measurement
05: FP Scan interval (ms,
minimum 0.6666 x
reps, limited to 25 ms)
06: FP Number of scans (units
of 1000)
07: 4 Number of samples
saved before trigger (not
used with serial output)
08: FP Trigger limit (mV,
unscaled measurement)
09: 4 Excitation voltage (mV)
10: 4 1st input location in
which to store data
11: FP Multiplier (not used with
serial output)
12: FP Offset (not used with
serial output)
Input locations altered: number of scans plus
number of samples saved before trigger
*** 24 CALIBRATION ***
Calibrate and put calibration values into input
locations if desired. Calibration takes place only
when Instruction 24 is executed. Automatic
calibration is disabled if Instruction 24 is in a
program table. See Section 13.7 for help on
when to use Instruction 24.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 2 Option (0 for most
applications)
02: 4 Beginning input
location (Option 0 does
not alter any input
locations)
Input Locations Used: 0 to 31 depending on
option and what is being used in the program.
TABLE 9-7
Option Description
0 Calibrate only the active components;
do not store the results
1 Calibrate only the active components;
store the active components
2 Calibrate all components; store the
results
3 Do not calibrate; store active
components
*** 25 READ PORTS ***
FUNCTION
The status of a group of ports selected by a
mask is read and placed in an input location.
The status is a base 2 representation of the
ports converted to base 10. Port 1 is the least
significant bit. For example, if all ports are read,
and the port status is as follows:
PORT C8 C7 C6 C5 C4 C3 C2 C1
VALUE 128 64 32 16 8 4 2 1
STATUS 0 0 1 1 0 0 1 0
(0=low,
1=high)
Base 10 equivalent: 32 + 16 + 2 = 50
50 will be stored in the input location.
The mask is also base 2 representation; 1
indicates the port is to be read, 0 results in a 0
for the port regardless of the status of the port
(AND operation). For example, if 50 (see above
example) is entered for the mask, ports 2, 5,
and 6 are read. If only ports 4 and 5 are high,
the status will be 16 (port 4 is not read).
NOTE: Voltages in excess of 16 volts
applied to a control port can cause the
CR23X to malfunction.
PARAM. DATA
NUM. TYPE DESCRIPTION
01: 4 MASK (0-255)
02: 4 INPUT LOCATION TO
STORE RESULT
Input locations altered: 1