Remote Technologies RPC-320 - Manual (Page 42)

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 m odes 1 or 2.
Pin 6 goes to about + 5 volts. These voltages may be
used to supply power to very low pow er amplifier s.
CALIBRATION
The A /D comes fa ctory ca librated for a 0 to 5V inpu t.
This range is chan ged 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 GN D 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. D o not exceed 5.2 or go below 4. 8
volts.
COMMANDS
The following RPBASIC-52 com mands are used for
analog I/ O. Mor e inform ation is found in the appendix
of this manu al.
Comm and Function
AIN(n) Returns analog value.
CON FIG AIN (n) Configures analog input
channels