Remote-processing RPC-2350 Bedienungsanleitung PDF herunterladen (Seite 47)

CHAPTER 8 ANALOG I/O

8-5

Figure 8-2 Calibration

Figure 8-3 Analog output IC’s, jumper, and connector

Figure 8-4 Jumper W12 detail

ANALOG OUTPUT

Two optional analog output channels are independently

configured for three voltage ranges. These ranges are

jumpered in hardwar e. Refer to the following table for

jumper settings. See Figure 8-4 for W12 detail.

Range

(Volts)

J7-17

(AOT 0)

J7-19

(AOT 1)

0 to + 5 W12[2-4] W12[1-3]

0 to + 10 W12[8-10] W12[7-9]

-5 to + 5 W12[6-8] W12[5-7]

Channel 0 output is J7, pin 17 and cha nnel 1 is J7, pin

19.

Analog output 1 may optionally be used for software

contrast adjustment for the LCD graphics display. When

it is used for this purpose, analog output 1 may not be

used for other pur poses, including 4-20 M a output.

IC Installation

The figure below shows where D/A IC’s are installed.

Analog output IC’s are Analog Devices AD7248 type.

This part may be ordered under Remote Processing Part

number 1454.

Follow these steps to install analog output IC’s.

1. Turn off power to the board.

2. Orient board as shown above. Orient IC so pin

1 (notch on IC) is towards the top of the board.

3. Install IC into appropriate socket. U11 for

channel 0, U12 for channel 1.

4. Set jumper W12 for desired output voltage.

You are now ready to power up the board.

Programming voltage output

The AOT command is used to send data to an analog

output. The syntax is:

AOT channel, value

Where:

channel specifies the analog channe l to write da ta to

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 82 83

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