ICP DAS USA I-7080 User Manual page 19

1.8.8 Frequency Input Applications
Type=51
$AAB0 input mode 0
$AA1H(data) &
$AA1L(data)
$AAB1 input mode 1
$AA1H(data) &
$AA1L(data)
$AAB2 input mode 2
$AA1H(data) &
$AA1L(data)
$AAB3 input mode 3
$AA1H(data) &
$AA1L(data)
The steps to measure frequency are given as following:
1. Use $AA1H(data) & $AA1L(data) to set the threshld value if
the frequency is non-isolated input.
2. Use $AAB? to select the mode (this command will clear the
current frequency first)
3. Use #AA? to perform frequency measurement
Note: Only four commands are important in frequency
measurement mode. These commands are given as following:
• $AAB?
• $AA1H(data)
• $AA1L(data)
• #AA?
The status-read-back commands are given as following:
• $AAB
• $AA1H
• $AA1L(data)
I-7080, I-7080D, I-7080B, I7080BD User Manual (V 2.2) ------------------ 19
Frequency 0
Non-isolated channel
0 & threshold value
active
Isolated channel 0
Non-isolated channel
0 & threshold value
active
Isolated channel 0
select mode
set high-level threshold value
set low_level threshold value
perform frequency measurement
mode read back
high_level threshold value read back
low_level threshold value read back
Frequency 1
Non-isolated channel
1 & threshold value
active
Isolated channel 1
Isolated channel 1
Non-isolated channel
1 & threshold value
active