ANALOG INPUT SECTION 10
Page 10-7 RPC-320
Voltage outputs from pins 6 and 10 are generated by the
RS-232 chip U8. Both of these voltages go through a
100 ohm resistor to H1-10 and H1-6. Pin 10 goes to 0
volts when operating the board in IDLE modes 1 or 2.
Pin 6 goes to about + 5 volts. These voltages may be
used to supply power to very low power amplifiers.
CALIBRATION
The A/D comes factory calibrated for a 0 to 5V input.
This range is changed by adjusting R17. You can adjust
the range to 5.12V. This is useful when the input is 0 -
5V and you want to know when the input is over-range.
To calibrate or adjust the voltage reference:
1. Connect the voltmeter ground to a GND point
on the Analog IN terminal strip. Make sure
there are no other connections to the analog
ground.
2. Connect the voltmeter ' + ' lead to U14, pin 6.
3. Adjust R5 for 5.00 VDC or other voltage as
desired. Do not exceed 5.2 or go below 4. 8
volts.
COMMANDS
The following RPBASIC-52 commands are used for
analog I/O. More information is found in the appendix
of this manual.
Command Function
AIN(n) Returns analog value.
CONFIG AIN (n) Configures analog input
channels
