User`s manual

BL4S100 User’s Manual 83
anaIn
int anaIn(int channel, int gaincode);
FUNCTION DESCRIPTION
Reads the state of an A/D converter input channel.
PARAMETERS
channel analog input channel number (0 to 7) corresponding to AIN0–AIN7
gaincode the gain code of 0 to 7 (use a gain code of 4 for 4–20 mA operation)
channel
Single-Ended Differential 4–20 mA
0 +AIN0 +AIN0 -AIN1 +AIN0
1 +AIN1 — +AIN1
2 +AIN2 +AIN2 -AIN3 +AIN2
3 +AIN3 — +AIN3
4 +AIN4 +AIN4 -AIN5
5+AIN5 —
6 +AIN6 +AIN6 -AIN7
7+AIN7 —
Gain Code Macro
Value Range
Voltage
Range
Single-Ended
Unipolar
Differential
Bipolar
0 GAIN_X1 0–20 V ± 20 V 0–20 V
1 GAIN_X2 0–10 V ± 10 V 0–10 V
2 GAIN_X4 0–5 V ± 5 V 0–5 V
3 GAIN_X5 0–4 V ± 4 V 0–4 V
4 GAIN_X8 0–2.5 V ± 2.5 V 0–2.5 V
5 GAIN_X10 0–2 V ± 2 V 0–2 V
6 GAIN_X16 0–1.25 V ± 1.25 V 0–1.25 V
7 GAIN_X20 0–1 V ± 1 V 0–1 V