Remote-processing RPC-330 Manuel d'utilisateur télécharger pdf (Page 39)

ANALOG INPUT SECTION 10

Page 10-5 RPC-330

Figure 10-2 Amplifier Circuit

AMPLIFIERS

Two operational amplifiers are available to signal

condition inputs.

Amplifiers are accessed through header connector H1.

Pin out is as follows:

H1 pin Function

1 Temperature output from U14

2 To channel 0 analog input

3 Non-inverting input, amplifier A

4 Output from amplifier A

5 Inverting input, amplifier A

6 Appr oximately + 12V supply

7 Ground

8 Ground

9 Non-inverting input, amplifier B

10 Approximately -12V supply

11 Inverting input, amplifier A

12 Output from amplifier A

13 5.000 V r eference output

14 Ground

Voltage outputs from pins 6 and 10 are generated by the

RS-232 chip U8. These voltages go to 0 volts when

operating the board in IDLE m odes 1 or 2.

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 com mands are used for

analog input. More inform ation is found in the appendix

of this manual.

Command Function

AIN(n) Returns analog value.

CONFIG AIN (n) Configures analog input

channels

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 47 48

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Remote-processing RPC-330 Manuel d'utilisateur Page 39

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