Campbell Scientific CR10X Measurement and Control System - Manual (Page 243)

APPENDIX B. CONTROL PORT SERIAL I/O INSTRUCTION 15
B-11
07: 13 Input termination character is
Carriage Return
08: 9 Max characters to receive + 1
09: 100 Delay for input is 1.0 second
10: ? First input location, User's choice
11: 1 Multiplier
12: 0.0000 Offset
The following paragraphs contain more detailed
information on some of the parameters.
Parameter 2 - Set to 00 to select the TTL
logic levels.
Parameter 4 - The “A” control port is
connected to the "shut down"
line (green); the “B” to the TTL
dataline (black).
Parameter 7 - The input termination
character is carriage return (13).
Parameter 8 - Total number of characters to
expect per input for 1 barometric
reading is 9. One value from the
AIR barometer typically consists
of an occasional garbage
character, a sign, 5 data
characters, 1 decimal point, and
a carriage return.
When reading a serial input, Instruction 15 uses
intermediate and input locations. One input
location is required per data point. The number
of intermediate locations consumed is
dependent on the value of Parameter 8. To
minimize the number of intermediate locations
used, Parameter 8 should be equal or one
greater than the number of characters per
barometer output.
Table 3 provides information on the number of
characters to expect from various barometer
modes.
If the barometer output contains multiple data
points, the input location specified in Parameter
10 is sequentially incremented for each data
point.
Parameter 9 - The time out parameter limits
the amount of time that
Instruction 15 waits to receive a
input. The execution time of
Instruction 15 is dependent on
both the hook-up configuration
and the barometer jumper
configuration. Exact execution
time must be verified, but an
initial estimate may be
calculated as follows:
HOOK-UP CONFIGURATION #1:
ET = 0.1 x MA + 0.9
HOOK-UP CONFIGURATION #2:
ET = 0.1 x MA + 0.6
WHERE: ET = Execution time in seconds
MA = Number of measurements averaged by
the sensor
Parameter 9 Time out = ET/0.01