Denso Power Net Terminal BHT-7500 Specifikace Strana 495

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486
*8
The BHT-4000 returns the re-read prevention enabled time length in units of 100 ms. If the
returned value is zero (0), it means that the re-read prevention is permanently enabled so
that the BHT-4000 does not read same bar codes in succession.
*9
An 8-bit binary pattern (bits 7 to 0) on the input ports 10h to 64Fh (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.
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.
*1
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.
*2
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.
*3
The RS (RTS) signal is controllable when the communications device file is opened. If the
file is closed, this signal specification will be ignored.
*4
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
*5
The sleep time feature automatically interrupts program execution if no event takes place
within the specified length of time preset by bit 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
*6
Available on the direct-connect interface. If the communications device file is closed, this
specification will be ignored.
Port No. Bit assignment
*1
Controls the following:
10
1
Reading confirmation LED (red)
*2
Reading confirmation LED (green)
*2
0: OFF
0: OFF
1: ON
1: ON
2 0 RS (RTS) signal
*3
0: OFF (Low) 1: ON (High)
3 2-0 LCD contrast level
*4
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
*5
0 to 255
Dh 0 ER signal
*6
0: OFF 1: ON
Eh 0 System status indication
*7
0: OFF 1: ON
Fh 7-0 Re-read prevention enabled time
*8
0 to 255
10h-64Fh 7-0 VRAM
*9
0: OFF 1: ON
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