Remote-processing RPC-330 Manuel d'utilisateur télécharger pdf (Page 22)

DIGITAL I/O SECTION 6

Page 6-1 RPC-330

Figure 6-1 Digital I/O

INTRODUCTION

Digital I/O lines ar e used to inter face with opto-module

racks, switches, low current LED's, and other TTL

devices. The RPC-330 has 34 of these lines. 8 TTL I/O

lines go to a terminal strip. 24 to an IDC connector.

Additionally, there is one high current output and an

opto-isolated input. Refer to the figure below for the

location of these lines.

Eight lines at P6 are intended for general purpose TTL

I/O such as switches, level sensors or to drive other

devices.

A 24 line connector, J3, is intended to interface to opto

racks or other TT L devices. 8 of these lines are high

current outputs, capable of sink ing 75 to 200 m a. O pto

modules sense presence of AC or DC voltages or switch

them.

L8 at P2 is a "zero" ohm FET switch. It is intended for

switching L ED back lighting on an LCD display. This

line may also be used to switch high current, high

voltage power. It can switch up to 2 amps.

INT 0 and INT 1 at P2 and P3 may be used as input

lines provided that they are not used as interrupt lines.

Hardware counters may not be configured to interrupt

when these lines are inputs.

ISOA/B at P2 may be used as an isolated input or an

interrupt for INT 0.

In addition to the 24 I/O lines from J3, the display port

can be used as digital I/O. Refer to Section 8 for more

information.

WARNING:

Apply power to the RPC-330 before applying a

voltage to the digital I/O lines to prevent current

from flowing in and damaging devices. If you

cannot apply power to the RPC-330 first, contact

technical support for suggestions appropriate to your

application. Power may be applied to ISOA/B at

any time.

Several softwar e comm ands support the digital I/O ports.

ON LINE br anches to a subroutine when a line changes.

ON COUNT counts the number of high to low

transitions at a digital line. Maxim um counting rate is

about 95 Hz. These commands simplify design and

greatly speed up execution. See Appendix A for more

information.

DIGITAL I/O PORTS

All ports use an 82C55 for I/O. Lines are accessed

using the LINE or LINEB comm ands. Lines at J3 and

P6 are configured for inputs or outputs using the

CONFIG LIN E command.

WARNING:

When configuring lines for outputs using CONFIG

LINE, lines go low momentarily (less than 10

micro-seconds) until they are set high again per the

data in the command line. Some other lines are

affected when CONFIG LINE 0 is executed. Refer

to CONF IG LINE command in Appendix A for

more information.

Digital Por t J3

This port is used to interface opto modules (using MPS

series racks), drive small relays, solenoids, m otors, or

lamps, and provide general purpose TTL I/O to other

logic devices or mechanical switches. J3 pin out is at the

end of this section.

The lines on J3 are divided into 3 eight bit groups from

an 82C55. Ports A and B are configured as all inputs or

outputs. Port C is programmed as one gr oup of 8 inputs

or outputs or as two groups of four lines (upper and

lower C). The four lines in upper and lower C can each

be programmed as all inputs or outp uts. R efer to T able

6-1 to determine the opto channel or J3 pin number for a

port. Use C ONF IG LIN E 100 (A ppendix A) to

configure ports A, B, and C for inputs or outputs.

When a line is configured as an output, it can sink a

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Remote-processing RPC-330 Manuel d'utilisateur Page 22

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