Campbell Scientific CR7 Measurement and Control System User Manual
Page 100
SECTION 9. INPUT/OUTPUT INSTRUCTIONS
9-10
instructions and examples. This instruction is
not in all PROM options.
PARAM.
DATA
NUMBER
TYPE
DESCRIPTION
01:
2
SDM address (base
4:00..33)
02:
4
*Input configuration;
channels 8,7,6,5
03:
4
*Input configuration;
channels 4,3,2,1
04:
4
**Function; channels 8,7,6,5
05:
4
**Function; channels 4,3,2,1
06:
4
***Output option
07:
4
Starting input location
number
08:
FP
Mult
09:
FP
Offset
*
Input configurations:
0 = high level, rising edge
1 = high level, falling edge
2 = low level, rising edge
3 = low level, falling edge
** Functions:
0 = no value returned
1 = period in ms
2 = frequency in kHz
3 = time since previous channel's edge
in ms
4 = time since channel 1 in ms
5 = counts on channel 2 since channel
1, linear interpolation
6 = frequency in kHz (low resolution)
7 = counts
8 = counts on Channel 2 since Channel
1, no interpolation
*** Output option:
0
Average over execution interval
0--
Continuous averaging
XXXX
Averaging interval in msec,
XXXX>0
XXXX-- Capture all events until
XXXX edges of channel 1 9999-- Test memory Input locations altered: 1 per function *** 102 SDM-SW8A *** The 8 channel SDM-SW8A Switch Closure Input The SW8A is addressed by the datalogger, If more channels are requested than exist in one Only one Function Option (Parameter 3) may be Function Option 0 provides the state of the Function Option 1 provides signal duty Function Option 2 provides a count of the Function Option 3 provides the signature of Parameter 4 specifies the first SW8A channel to
(0
Module is a peripheral for measuring up to 8
channels of switch closure or voltage pulse
inputs. Each channel may be configured to read
single-pole double-throw (SPDT) switch closure,
or single-pole single-throw (SPST) switch
closure, or voltage pulse. Output options
include counts, duty cycle, and state. This
instruction is not in all PROM options.
allowing multiple SW8A's to be connected to one
datalogger. 16 addresses are available.
module, the datalogger automatically increments
the address and continues to the next SW8A.
The address settings for multiple SW8A's must
sequentially increase. For example, assume 2
SW8A's addressed as 22 and 23 are connected,
and 12 Reps are requested. 8 channels from
the first SW8A and the first 4 channels from the
next will be read.
specified per Instruction 102. If all 4 functions are
desired, the instruction must be entered 4 times.
signal at the time P102 is executed. A 1 or
0 corresponds to high or low states,
respectively.
cycle. The result is the percentage of time
the signal is high during the sample interval.
number of positive transitions of the signal.
the SW8A PROM. A positive number
(signature) indicates the PROM and RAM
are good, a zero (0) indicates bad PROM,
and a negative number indicates bad RAM.
Function Option 3 is not used routinely, but
is helpful in "debugging". Only one Rep is
required for Option 3.
be read (1..8). One or more sequential channels
are read depending on the Reps. To optimize
program efficiency, the sensors should be wired
sequentially.