Denso Power Net Terminal BHT-7500 Specifikace stáhnout pdf (Strana 493)

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Lower three bits (bit 2 to bit 0) in this byte represent the contrast level of the LCD in 000 to

111 in binary notation or in 0 to 7 in decimal notation. 0 means the lowest contrast; 7

means the highest.

The LCD contrast, message version (English/Japanese), and VRAM should not be moni-

tored by using a

WAIT statement. These status may not change while a user program

monitors them by this statement. The

WAIT statement used for this purpose may cause

the program to enter an infinite loop.

In System Mode, the message version appears as Eng or Jpn on the LCD.

An 8-bit binary pattern (bits 7 to 0) on the input ports 10h to 18Fh (which read VRAM) rep-

resents a basic dot pattern column of the LCD. Bit value 1 means a black dot. The port

number gives the dot column address.

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Output Ports

A user program can control the hardware through the output ports by using the OUT statement.

BHT-BASIC defines each of these ports as a byte. The table below lists the output ports and

their controlling function in the BHT.

BHT-BASIC represents the bit order by the exponent of each binary digit in the byte. For

example, bit 0 means LSB; bit 7 means MSB.

The reading confirmation LED is controllable only when the bar code device file is closed.

If the file is opened, the

OUT statement will be ignored.

Lower three bits (bit 2 to bit 0) in this byte control the contrast level of the LCD in 000 to 111

in binary notation or in 0 to 7 in decimal notation. 0 means the lowest contrast; 7 means the

highest. Shown below are examples of OUT statements.

OUT 3,7 ’Contrast is highest

OUT 3,&h07 ’Contrast is highest

The sleep timer feature automatically interrupts program execution if the BHT-3000

receives no input within the specified length of time preset by bits 7 to 0. Shown below are

examples of OUT statements. Setting 0 to this byte disables the sleep timer feature. (Refer

to Chapter 10.)

OUT 6,30 ’3 seconds

OUT 6,0 ’No sleep operation

An 8-bit binary pattern (bits 7 to 0) on the output ports 10h to 18Fh (which are stored in the

VRAM) represents a basic dot pattern column of the LCD. Bit value 1 means a black dot.

The port number gives the dot column address.

Port No. Bit assignment

Controls the following:

Reading confirmation LED (red)

Reading confirmation LED (green)

0: OFF

1: ON

3 2-0 LCD contrast level

0 to 7 (0: Lowest, 7: Highest)

4 0 Message version 0: Japanese 1: English

5 0 Alphabet entry function 0: Disable 1: Enable

6 7-0 Sleep timer

0 to 255

10h-18Fh 7-0 VRAM

0: OFF 1: ON

1 2 ... 488 489 490 491 492 493 494 495 496 497 498 ... 559 560

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