SECTION 9. INPUT/OUTPUT INSTRUCTIONS

of the measurement. An AVW1 or AVW4 Vibrating Wire Interface is usually required for these sensors.

PARAM.

DATA

 

 

NUMBER

TYPE

DESCRIPTION

01:

2

Repetitions Hit C (--) to

 

 

skip repeat of

 

 

excitation

02:

2

Single-ended channel

 

 

for first measurement

03:

2

Excitation Channel

04:

2

Start frequency of

 

 

sweep (100'S of Hz)

05:

2

End frequency of

 

 

sweep (100'S of Hz)

06:

4

# Cycles to measure (0

 

 

means none)

07:

4

Delay before excitation

 

 

applied (0.01 sec units)

08:

4

Input location (1/T2), T

 

 

in ms

 

09:

 

FP

Multiplier

10:

 

FP

Offset

*** 101 SDM-INT8 ***

FUNCTION

The 8 channel Interval Timer (INT8) is a measurement module which provides processed timing information to the datalogger. Each of the 8 input channels may be independently configured to detect either rising or falling edges of either a low level AC signal of a 5 V logic signal. Each channel may be independently programmed. See the SDM-INT8 manual for detailed instructions and examples.

PARAM.

DATA

 

NUMBER

TYPE

DESCRIPTION

01:

2

Address of INT8

02:

4

*Input config; channels

 

 

8,7,6,5

03:

4

*Input config; channels

 

 

4,3,2,1

04:

4

**Function; channels

 

 

8,7,6,5

05:

4

**Function; channels

 

 

4,3,2,1

06:

4

***Averaging option

07:

4

Loc

08:

FP

Mult

09:

FP

Offset

Execution Time:

2.3 ms + 1.65 ms/value +

 

 

averaging interval if used

9-16

 

 

(See Appendix C for possible extra processing time for higher frequency signals.)

Intermediate Storage: 1 location

* Input configurations (Sect. 4.2):

0 = 5V logic level, rising edge

1 = 5V logic level, falling edge

2 = low level ac, rising edge

3 = low level ac, falling edge

** Function (Sect. 4.3):

0 =

none

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

*** Averaging option (Sect. 4.4):

0Average over execution interval

0- Continuous averaging XXXX Averaging interval in ms,

XXXX>0

XXXX- Capture all events until XXXX edges of channel 1 (0<XXXX, 9999)

9999- Test memory

*** 102 SDM-SW8A ***

FUNCTION

The 8 channel SDM-SW8A Switch Closure Input 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, single-pole single-throw (SPST) switch closure, or voltage pulse. Output options include counts, duty cycle, or state.

The SW8A is addressed by the datalogger, allowing multiple SW8A's to be connected to one datalogger. 16 addresses are available, but for most applications Campbell Scientific recommends no more than 4 SW8A's be connected to one datalogger.