Remote-processing RPC-210 Bedienungsanleitung PDF herunterladen (Seite 50)

DISPLAY & KEYPAD PORTS BASIC SECTION 11

Page 11-2

Next, display type is set using the CONFIG DISPLAY

command. Functional display types are 0 for the 4 x 40

character display and 1 for the 4 x 20.

CONFIG DISPLAY 0

initializes the display and software for a 4 x 40 character

display.

CONFIG LIN E must be executed before CO NFIG

DISPLAY.

The DISPL AY comm and is used to position and print

information.

DISPLAY (0,2),”Hello”

Starts writing at the first line, 3rd column.

Row and colum n positions begin with number 0. T hus,

(0,0) is the upper left corner. (1, 3) is the second line,

4th column position.

DISPLAY may be used without row and column

positioning information. In that case, printing picks up

where the cursor is at.

CLEAR DISPLAY is used to clear the entire display.

CLE AR D ISPL AY L INE clears the line the cursor is

currently at and positions the cursor at the beginning of

that line.

Hiding the cursor

The cursor cannot be hidden. It can be placed out of the

way, usually in the lower right corner For the 4 x 40

display, execute

DISPLAY(3,39)

and for the 4 x 20 display, execute

DISPLAY(3,19)

USING “UNSUPPORTED” DISPLAYS

Other LC display sizes, such as 1 x 16 or 2 x 20, will

work. Display pin outs, described below, are different

for differ ent displays. However, you should be able to

use the DISPLA Y CO NNECT OR P IN OU T table to

make a custom cable.

Displays with one “E” line should be initialized for the 4

x 20 display. The next real issue becomes positioning

the cursor. Position (0,0) and the top row is universal

and you can use the positioning part of the DISPLAY

statement without problem (usually). Accessing other

lines may be tricky. This will depend upon the size of

the display used. The fastest way to determine cursor

position is to try using different DISPLAY (X,Y)

commands.

DISPLAY PIN OUTS

Pin outs for a size and type of LC D are generally

standard. However, pin outs for different display sizes

are not. The mechanical pin out for a 4 x 40 display is

different from a 4 x 20, which is different from a 2 x 20.

Some are dual 16 pin, others are dual 14 pin, and some

are single line 14 pin. To further complicate matters,

the numbering scheme changes whether you take the

signals from the top or bottom of the display.

Electrically, all of these displays are the same or very

similar.

The following tables are pin outs for J4 on the RPC-210

and the two most popu lar display types. Table 13- 2 is

for a 4 line by 40 character display. Table 13-3 is for

most other displays. This table is usually valid for 14

pin displays.

J4 pin out was optimized for a Optrex 4 x 40 display. A

simple 16 pin IDC connector from J4 to the display is all

that is needed. T he connector fr om this display must

mount on the bottom o f it.

Other 14 pin, dual in line displays m ay also directly

connect using a simple IDC connector. The display

connector mounts on the top side and the ribbon cable is

reversed (display pin 1 goes to pin 14 on J5 side).

Connector Orientation

J4 is an open header connector. Pins 1 and 2 are marked

on the board. As a further aid, a " key" outline is also on

J5.

CONTRAST/ANGLE ADJUSTMENT

Pot R7 is used to adjust display contrast and viewing

angle. The pot is ad justed to 0V at the factory. Its

range is approximately + 5V to -2V, depending upon

display current draw. Adjust R7 for best contrast after

initialization.

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