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ANALOG OUTPUT SECTION 14

Page 14-1 RPC-330

Figure 14-1 Analog Output

DESCRIPTION

Two optional analog output channels are available. They

can be configured to operate in one of three voltage

ranges. Voltage ranges are jumpered in hardw are using

W13 and W15. Outputs are located at P3 and are

designated as VO 0 and VO 1.

Voltage Vo 0 Vo 1

Range W13 W15

0 - 5V [4-5] [4-5]

0 - 10V [1-2] [1-2]

±5V [2-3] [2-3]

Installing a Channel

A MAX508 or AD7248 converter (P/N 1354) is used as

the D/ A. Channel 0 goes in socket U20 and channel 1

goes in socket U21.

Before installing a chip, ground yourself and make sure

power is removed. Align pin 1 on the chip to pin 1 on

the socket. Pin 1 on both the socket and IC is marked

with either a "1", dot, or notch.

Output a Voltage

The AOT command is used to send data to an analog

output. The syntax is:

AOT channel, value

channel specifies the analog channel to write data to and

is either a 0 or 1.

value is a number from 0 to 4095. The higher the

number, the more positive the output voltage.

The follow ing exam ples conver t a voltage to a num ber to

produce an output.

AOT c,409.5 * v 0-10V range

AOT c,819 * v 0-5V range

AOT c,v*819 + 2047.5 ±5V range

Noise Reduction

Analog outputs may be too noisy for some applications.

To reduce noise, simply add a 1 µF capacitor between

the output and ground.

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Remote-processing RPC-330 Manual de usuario Pagina 46