Remote-processing RPC-330 Manual de usuario descargar pdf (Pagina 26)

DIGITAL I/O SECTION 6

Page 6-5 RPC-330

Maximum continuous current is 2 amper es at 60 volts @

25 C. ON resistance is 0.5 ohm s. Cur rent capability of

this FET is higher. However, if you draw more than 2

amperes, consider attaching a heat sink to Q2.

This port is accessed using the LINE #8 command. Line

100 turns on the FET while line 200 turns it off.

100 LINE#8,1

200 LINE#8,0

Use the circuit in figure 6-2 when switching inductive

loads.

Digital I/ O prog ramm ing exam ple

The follow ing exam ple read s a switch at po rt A, bit 3

(J3-25) (program line 200), reads L1 at P6 (program line

210) and turns on opto module at channel 5 (program

line 220). A LED is controlled through the high current

port at J3-10 (port B, bit 0) (program lines 230 and 240).

For testing, a 100 ohm resistor from J3-10 to + 5 volts

can be substituted.

100 CONFIG LIN E 100,13, 1,1, 1

200 D = LINE #(125)

210 F = LINE (1)

220 LINE 105, 1

230 LINE #110,1 :REM Turn on LED

240 LINE #110,0 :REM Turn off LED

300 G = LINE B(3,0) :RE M Re turns data a t port A

310 LIN EB 3, 1,5 :RE M w rites 5 to por t B

Line 100 configured the 82C55 so ports A and C are

inputs while B is the output.

Note that the LINE statement is used to control both opto

modules and individual lines.

Lines can also be read or controlled in the imme diate

mode.

PRINT LINE#(125)

returns the status at J3-25. Notice that even when a line

is configured as an output, its status can be read back.

Execute the following to control L7.

LINE 7,OFF

sets L7 low. Executing

LINE 7,ON

sets the line high.

LINEB is used to read and write a byte at a time.

LINEB 3,1,128

sets port B, bit 7 high and bits 0-6 are low.

Pulse Width Modulation (PWM)

A line accessible by the LIN E comm and may be pulse

width modulated. PW M comm and parameters determ ine

high and low time (to 5 ms resolution) and, optionally,

number of pulses.

Use PWM to control the brightness of a display (via line

8), control the speed of a motor, or output a number of

pulses to a stepper controller. Brightness control using

LED' s is best achieved when htime or ltime are less than

5 (25 ms). One of the parameters should be 1.

Noticeable flicker occurs when htime and ltime sum to

more than 6 (30 ms).

See the PWM command in the Software Supplement for

more information. Use Table 6-1 to use an output

directly from J3.

LINE MONITORING COMMANDS

ON LIN E and ON C OUNT are used to monitor any 8

lines while program execution continues. Use ON LINE

to monitor any change in state of a line. ON C OUN T is

used to count relatively slow (less than 95 H z) pulses.

ON COUNT can be used to generate an interrupt every

time a line goes low. Simply set the count param eter to

a 1.

Lines are m onitored by the oper ating system every 5 ms.

ON LINE generates an interrupt when a line changes

from the last monitored state. At the end of the current

BASIC statement a software interrupt is generated.

ON COUNT can generate a software interrupt when the

number of counts at a line reaches a preset number. It

can also count the number of pulses at a line.

Both of these interrupts are lower priority than ONTICK

or ONITR. Refer to Appendix A, INTERRUPTS

section under the ONITR com mand for operating and

priority information.

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Remote-processing RPC-330 Manual de usuario Pagina 26

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