Remote-processing RPC-210 Instrukcja Użytkownika Pobierz pdf (Strona 47)

ANALOG I/O BASIC SECTION 10

Page 10-5

Figure 10-2 5V Analog IO calibration

you should use the 2.5V range instead.

To calibrate or otherwise adjust the reference, connect

volt meter ground a t J10-2. Connec t voltmeter (+ ) to

W11, pin 1, side closer to end of card. Adjust R16 for

5.000 volts or other desired voltage.

Make sure jumper W11 is installed.

2.500V Reference

Jumper W11 must be removed. When removed, A/D

and D/A ranges are 0 - 2.5V.

There is no adjustment for this reference. The voltage,

measured at W11, pin 2, normally is 2.50 V but can

range from 2.45 to 2.55 VDC.

ANALOG OUTPUT

Two analog outputs are available at J10, pins 17 and 19.

Output voltage range depends upon the setting of jumper

W11. When W 11 is installed, output range is about 0 to

5 volts. Removed, range is about 0 to 2.5 volts. There

is a small am ount of offset at the 0 volt output.

Output Command

The AOT command is used to set an a nalog output.

AOT channel, value

channel specifies the analog channe l to write to and is

either a 0 or 1. Channel 0 is at J10-17, channel 1 is at

J10-19.

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

number, the mor e positive the output.

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

produce an output.

AOT C,819 * V 0-5V range

AOT C,1638 * V 0-2.5V range

A 1 bit, or count, change in value produces a 0.001221

volt change in the 0-5V range and changes 0.00061035

volts in the 0-2.5V range.

Maximum current output should be limited to 1 mA. for

each channel.

ANALOG POWER SUPPLY OUTPUT

Some power is available at J10 for external analog

amplifiers, buffers, and sensors. J10-18 provides about

+ 8V and J10-20 is about -8V.

The amount of current available depends upon several

factors. This power is generated from the RS-232

converter chip U 12. If there is a lot of transm it activity

on both serial ports current is reduced. T he amount

depends upon load impedance. Analog outputs (D/ A’s)

can also use power if they are driving a load. When the

analog I/O range is 5V more current is consumed.

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