Denso Power Net Terminal BHT-7500 Spécifications Page 494

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485
Appendices
D2. BHT-4000
Input Ports
A user program can monitor the hardware status through the input ports by using the WAIT
statement or INP function. BHT-BASIC defines each of these ports as a byte. The table
below lists the input ports and their monitoring 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
During the optical interface operation and direct-connect interface operation, a user pro-
gram can monitor CS (CTS) signal. If CS signal is received, bit 7 of this byte goes ON (1).
If the communications device file is closed, the BHT-4000 returns the value 0.
*3
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.
*4
The LCD contrast, message version (English/Japanese), ER signal, system status indica-
tion, and VRAM should not be monitored 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.
*5
In System Mode, the message version appears as English or Japanese on the LCD.
*6
The ER and CD signals are supported on the direct-connect interface only. If the communi-
cations device file is closed, the BHT-4000 returns the value 0.
*7
The BHT-4000 can display the system status on the bottom line of the LCD. If the system
status is displayed, the BHT-4000 returns the value 1; if not, it returns the value 0. For the
system status indication, refer to Chapter 7, Subsection 7.1.7.
Port No. Bit assignment
*1
Monitors the following:
00
1
2
3
4
5
6
7
Keyboard buffer
Barcode buffer
Trigger switch
Receive buffer
Value of
TIMEA function
Value of
TIMEB function
Value of TIMEC function
CS (CTS) signal
*2
0: No data
0: No data
0: OFF
0: No data
0: Nonzero
0: Nonzero
0: Nonzero
0: OFF or file closed
1: Data stored
1: Data stored
1: ON
1: Data stored
1: Zero
1: Zero
1: Zero
1: ON
3 2-0 LCD contrast level
*3 *4
0 to 7 (0: Lowest, 7: Highest)
4 0 Message version
*4 *5
0: Japanese 1: English
5 0 Alphabet entry function 0: Disabled 1: Enabled
Dh
Dh
0
4
ER signal
*4*6
CD signal
*6
0: OFF
0: OFF
1: ON
1: ON
Eh 0 System status indication
*4*7
0: OFF 1: ON
Fh 7-0 Re-read prevention enabled
time
*8
0 to 255
10h-64Fh 7-0 VRAM
*4 *9
0: OFF 1: ON
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