Advantech Carbon Monoxide Alarm PCI-1718 Series User Manual
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Appendix C
C.5 A/D Range Control — BASE+01H
Each A/D channel has its own individual input range, controlled by a
range code stored in onboard RAM. If you want to change the range code
for a given channel, select the channel as the start channel in register
BASE+02H, MUX scan (described in the next section), then write the
range code to bits 0 to 3 of BASE+01H.
range code stored in onboard RAM. If you want to change the range code
for a given channel, select the channel as the start channel in register
BASE+02H, MUX scan (described in the next section), then write the
range code to bits 0 to 3 of BASE+01H.
G3 ~ G0
A/D range control
G0
The least significant bit (LSB) of the A/D range
G3
The most significant bit (MSB)
Range codes appear below:
Table C.6: Register for A/D Range Control
Write
A/D range control
Bit #
7
6
5
4
3
2
1
0
BASE + 01H
X
X
X
X
G3*
G2*
G1
G0
PCI-1718HDU
Input Range (V)
Unipolar/Bipolar
Gain Code
G3
G2
G1
G0
-5 to +5
B
0
0
0
0
-2.5 to +2.5
B
0
0
0
1
-1.25 to +1.25
B
0
0
1
0
-0.625 to +0.625
B
0
0
1
1
0 to 10V
U
0
1
0
0
0 to 5V
U
0
1
0
1
0 to 2.5V
U
0
1
1
0
0 to 1.25V
U
0
1
1
1
-10V to +10V
B
1
0
0
0
N/A
1
0
0
1
N/A
1
0
1
0
N/A
1
0
1
1
N/A
1
1
0
0
N/A
1
1
0
1
N/A
1
1
1
0
N/A
1
1
1
1