Remote-processing RPC-52 Instrukcja Użytkownika Pobierz pdf (Strona 25)

CHAPTER 8 DISPLAY PORT

Page 23

Figure 8-1 Display interface

INTRODUCTION

RPBASIC-52 and the RP C-52 ca n interface to a variety

of displays:

VF (vacuum florescent) character

LCD (liquid crystal) character

LCD graphics

Character display sizes range from four lines by 20

characters to four lines by 40 characters. The graphics

display supports 160 x 128 pixels. Remote Processing

supplies these displays with appropr iate cables.

A contrast adjustment for LCD character displays is built

into the card. All displays connect to J6. An

appropriate cable connects a display to the RPC-52.

If a display is not used, J6 may be used for general

purpose digital I/O. Port A and part of port B from an

82C55 are available.

The cable length to a display depends upon the amount

of current it requires. A significant amount of voltage

drop occurs with a long cable. VF and LC D graphics

cables should be less than 2 feet. A character LCD

display cable should be less than 5 feet.

CONNECTING DISPLAYS

The display port is designed to supply all the lines

necessary for VF and L CD displays. A custom cable

connects the RPC-52 to the display.

Displays purchased from Remote Processing include a

cable. You simply connect the 20 pin connector to the

RPC-52 LCD display port and the other end into the

display.

Additional w iring is usually r equired for LC D graphic

and VF character displays. This information is included

with the display. Information content is display

dependent. Below is general information on both.

Graphic displays require additional voltages not

generated on the RPC-52. These must be supplied

externally. An external contrast adjustment may be

necessary. You may be able to connect these through

screw terminal block P6.

VF character displays require + 5 volts and ground to be

brought to connector P6. This may in the form of

external wires from the main power connector on the

board. Power is not supplied from the board due to the

danger of ground loops.

Additional information for commands mentioned in the

following text may be found in the RPBASIC-52

Software Supplem ent in this manual.

WRITING TO THE DISPLAY

The display type must first be set using the CONFIG

DISPLAY command. T he DISPLAY com mand is used

to print information. The display type is stored in the on

card serial EEPROM. CONF IG DISPL AY needs to be

done only once.

PROGRAMMING EXAMPLE

The example below is for a four line by 40 character

LCD display. Even though DISPL AY statements do not

end with a comma (, ), a < cr> < lf> sequence is not

sent. Use CR to force a retur n. A CR does not scroll

characters on a display. You must position the cur sor to

the next line.

CONFIG DISPLAY X

10 STRING 200,30

20 $(0) = "Remote Processing display"

30 DISPLAY (1,2),$(0)

DISPLAY TYPES

RPBASIC-52' s software driver is based upon the

characteristics of the display family. Compatible VF and

LCD displays are shown below:

Manufact. Model Type

Optrex DMC 40457 LCD 4 x 40

Optrex DMC 40202 LCD 2 x 40

IEEE 3601-90-080 VF 4 x 20

Optrex DMF 682N LCD 160W x 128D

DISPLAY CONNECTOR PIN OUT - J6

The display port uses an 82C5 5 for data and contr ol.

The table below lists a pin number and its intended

function. A display may not use all lines even though

they are available.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 35 36

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