Remote-processing RPC-210 Manuel d'utilisateur télécharger pdf (Page 49)

DISPLAY & KEYPAD PORTS BASIC SECTION 11

Page 11-1

Figure 11-1 Keypad and Display Connectors

INTRODUCTION

DISPLAY PORT SECTION 11

Port J4 supports 4 x 20 and 4 x 40 character LC

displays. Eight lines from digital I/ O por t J3 are used to

write to the display. Angle/ contrast adjustment via R7 is

provided as are + 5V and ground. Figure 13-1 on the

next page shows the location of the connector and R7.

Eight I/O lines for the display are shared between J3 and

J4. All port A lines are used for the display.

A number of character displays may be used. Program

examples assume a HD44780 contr oller is used. This

controller is used on Optrex, AND , Stanley, and other

displays. IEEE LC displays have been successfully used.

Some VF displays from Noritake are LCD interface

compatible.

The keypad port at J5 is for a 4 x 4 matrix, 16 position

keypad. The RPBASIC-52 oper ating systems scans and

debounces the keypad e very 100 mSec. A key is

recognized when a row and column connect.

RPBASIC-52 scans and debounces the keypad every 100

mSec. Keypad presses are returned as a number from 1

to 16 using the KEYPAD(0) function. Keypad scanning

is always active and cannot be turned off. Up to 8 key

presses are buffered.

Keypad presses are multi-tasked using ON KEYPAD.

When a key is pressed, the program br anches to the

subroutine.

Keypads from Remote Processing simply plug into J5.

Limit keypad cable length to less than 2 meters (6 feet).

CONNECTING DISPLAYS

The display port supplies all control lines for character

LC displays. Displays purchased from Remote

Processing include a cable. Simply connect the 16 pin

connector to J4 and the other end into the display.

WRITING TO THE DISPLAY

The display port m ust be initialized using 2 command s.

First, port A must be configured as an output using

CONF IG LINE 100. Port B and C may be configured

as inputs or outputs as necessary. When setting the

output status, port A should be set to 255. The

following example sets ports A and B to output and port

C to input.

CONFIG LINE 100,5,255,255,255

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 59 60

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Remote-processing RPC-210 Manuel d'utilisateur Page 49

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