Remote-processing RPC-2350 Manuel d'utilisateur télécharger pdf (Page 52)

CHAPTER 10 DISPLAY PORT

10-1

Figure 10-1 LCD character connector and contrast adjust

CHAPTER SYNOPSIS

 Differences between RPC-2350 and RPC -2350G

 Programming for a display

 Multiple use note

DESCRIPTION

DISPLA Y POR TS CHA PTER 10

A display, in conjunction with a keypad, can give an

operator feedback on operation status and some level of

control over the process.

There are two display ports on the RPC-2350G: J6 is for

LCD character displays and J9 or J13 are for graphics

displays. The RPC -2350 has only J6, used for LCD and

VF character displays. This chapter discusses J6. See

Chapter 15 for graphics display port.

The LCD character and gr aphic por ts operate

independently of each other. The LCD character port

uses port A from an 82C 55 PIO chip. These lines at J6

are shared with some on J3 also. The graphics port has

its own driver and memory.

CAM BASIC comm ands are provided to position and

write characters to each display. Additional commands

are provided to draw lines, turn pixels on and off, and

print large characters on the graphics display.

LCD CHARACTER PORT J6

You can use Liquid Crystal Displays (LCD) or vacuum

fluorescent displays at J6. Display sizes range from 1

line by 8 characters to 4 lines by 40 characters.

The pin out at J6 is designed to plug directly into Remote

Processing L CD 4 x 40 and LC D 4 x 20 displays.

Simply plug these displays into J6. A contrast

adjustment pot, R 13, controls the viewing angle. This

pot is adjusted after J6 is properly configured.

Any number of other LCD displays may be used. See

the table at the end of this sub-section for cable pin out.

Configuring J6 for a display

Two lines of CAM BASIC code must be executed in the

proper order befo re J6 is ready for displays.

First, you must configure the digital I/O port using the

CONF IG PIO command. Port A must be configured as

an output. If you are using a keypad, then set port C as

shown in the example below. Port B is usually set to an

output to drive the high current sinks. Refer to Chapter

6, DIGITAL I/O, for m ore information on port B and

general programming information.

Put the following line of code in your program:

CONFIG PIO 1,0,x,x,x,64

‘X’ parameter is 0 or 1 as needed in your application.

Refer to the CAMBA SIC Programming Manual for more

information about CONFIG PIO. The address for the

display PIO chip is 64.

Next, determine the type of display you will be using.

Refer to the CAMBA SIC Programming Manual for a list

of types under CONFIG DISPLAY.

The following example configures J6 for a LCD 4 x 20

display:

CONFIG DISPLAY 64,4,1

The cursor was selected as blinking.

There are two LCD character display demonstration

programs that show how to position and write to the

display:

LCD440.BAS Writes to LCD 4 x 40

LCD420.BAS Writes to LCD 4 x 20

USING TWO DISPLAYS

The RPC-2350G is not intended to use both character

and graphics displays simultaneously. There is no

provision for switching the software between two

displays.

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