Remote-processing RPC-2350 Bedienungsanleitung PDF herunterladen (Seite 34)

CHAPTER 6 DIGITAL LINES

6-1

Figure 6-1 Digital I/O connectors

CHAPTER SYNOPSIS

 Overview of the digital lines

 How to program

 Using high current port

 Interfacing to opto racks

DESCRIPTION

DIGITAL LINES CHAPTER 6

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

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

devices. The RP C-2350 has 48 of these lines available

through J2 and J3.

J3 is shared with other connectors and functions. Eight

lines are high current outputs, capable of sinking 75 to

200 ma. Another 8 lines on J3 are shared by the keypad

connector, J5. Still another 8 lines are used by the LCD

character port J6. A table at the end of this chapter lists

line use at J3.

Eight, 16, or 24 position opto racks are connected to J2

or J3. These opto racks accept G4 ser ies opto modules.

G4 series opto modules are used to sense the presence of

AC or D C voltages or switch them. Maximum

switching current is 3 amperes.

WARNING:

Apply power to the RPC -2350 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-2350 first, contact

technical support for suggestions appropriate to your

application.

A high voltage (±15 volts) input is available at J10-10.

This input is intended for the counter. However, it can

be used as a digital input. Connect jumper block W9-2

to a digital input at J2 or J3.

On power-up or software reset ( or CAMBASIC CALL

0), all digital ports are reset to inputs.

DIGITAL I/O PORT

Digital I/O lines on the RPC-2350 are supplied by an

82C55 chip. The chip's lines primarily go to connectors

J2 and J3. Lines to J3 also go to J5 and J6. This part

assumes you will be using all lines at J3 for digital I/O.

The lines on J2 and J3 are divided into 3 eight bit

groups. Ports A and B can be configured as all inputs or

outputs. Port C can be programm ed as one group 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 progr ammed as all inputs or outputs.

Configuration is done in CAMBASIC using CONFIG

PIO comm and.

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

maximum of 2. 5 mA. at 0.4V and can sourc e over 2.5

mA.at 2.4V. Outputs sink 15 mA.at 1.0V.

J2 and J3 are accessed using CAMBASIC LINE, OPTO,

INP, and OUT statements. LINE r eads or writes to a

port based on the connector num ber. LINE is generally

used with the STB-26 boa rd. OPT O rea ds or writes to

an opto module based o n its position in an M PS opto

rack. INP and OU T access a byte of data at a port.

Refer to the tables at the end of this chapter for pin outs,

OPTO, and LINE references.

The base I/O address for J2 is 0 and J3 is 64 when using

INP, OUT, and CONFIG PIO statements. CONFIG

PIO statement is used to configure the 8255 lines for

inputs and outputs. Upon reset, watchdog time out, or a

CAM BASIC C ALL 0, lines are configured for inputs.

J2 and J3 are accessed using LIN E or O PTO statements

according to the table below.

Connector

designation

LINE #

terminal

OPTO rack

position

J2 1-25 0-23

J3 101 - 125 100 - 123

LINE #' s access the corresponding pin number on J2 or

J3. L INE # 2 or 102 are not va lid. T his is a + 5 volt

supply.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 82 83

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