Remote-technologies RPC-320 Bedienungsanleitung PDF herunterladen (Seite 23)

DIGITAL AND OPTO PORTS SECTION 6

Page 6-1 RPC-320

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-320 has 34 of these lines. 8 TTL I/O

lines go to a terminal strip. Additionally, there is one

high curr ent 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 on an opto rack 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.

ISOA/B is used as an isolated input as well as an

interrupt.

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

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

information.

WARNING:

Apply power to the RPC -320 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-320 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 LINE or LINEB commands. Lines at J3 and P6

are configured for inputs or outputs using the CONFIG

LINE comm and. See Appendix A for information.

WARNING:

When using CONFIG LIN E, output lines go low

momentarily (less than 10 micro-seconds) until they

are set high again as per the data in the command

line. Some other lines are affected when CONF IG

LINE 0 is executed. Refer to CONFIG LINE

command in Appendix A for more inform ation.

Digital Por t J3

This port is used to interface opto modules (using the

MPS series racks), drive small relays, solenoids,

motors, or lamps, and provide general purpose TTL I/O

to other logic devices or mechanical switches. The

LINE command is used to access and control this port.

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 outputs. Refer to Table

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

port. Use CONFIG LIN E 100 (Appendix A) to

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

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

maximum of 2. 5 ma at 0.4V and can source over 2. 5

ma. Outputs sink 15 ma at 1. 0V. This will dr ive opto

modules. Port B is connected to a high current sink

through U12. See "High current output" later.

Digital I/O lines at J3 m ay be pulled up to + 5 volts or to

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 50 51

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