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5-1
Section
Outline of Host Link/NT Link Operation
189
The range of each memory area differs according to the PC type. See Appen-
dix L “PC Memory Map” (page 327).
Note
Make the allocations so that there is no duplication between the PT status con-
trol area and the PT status notify area.
Notifying the Display Elements by Using Allocated Bits and Words
The NT620S/620C will operate as follows in the display element notification op-
eration.
[NT620S/620C operation]
The NT620S/620C will write any changes in the contents of the numeral or char-
acter-string memory table being displayed or pressing of a touch switch to the
bits and words area in the PC.
[NT620S/620C operation example]
Touch switch #12
Bit 009012
Numeral memory table 100
Copy
Bit 009012: ON
Numeral memory table 0
Number of saved words
: 1
First word
: DM0110
DM0110: 0432
NT620S/620C
PC
0
4
3
2
009012
DM0110
009012
DM0110
Notifying the NT620S/620C Status by Using Allocated Bits and Words ..... PT Status Notify Area (PT to PC)
The PT status notify area (PT to PC) is provided to notify the NT620S/620C sta-
tus changes to the PC. When any NT620S/620C status has changed, such
change is written to this area in the PC, and the PC will read the data from this
area to check the NT620S/620C status.
The PT status notify area is configured as three consecutive words as shown be-
low.
0
0
0
0
0
0
0
0
The first word (word m) of the PT status notify area must be set with the support
tool.
S
Currently displayed screen (refer to page 195)
The screen number displayed on the NT620S/620C is written to this word.
Simultaneously, the PT status screen switch strobe flag is set to ON (1). After
this is notified to the PC, this flag reverts to OFF (0). Checking the status of this
flag will provide a simple method of checking if the NT620S/620C display has
switched.
S
Content upgrade memory table (refer to page 220)
The number of the numeral or character-string table is written to the word when
the numeral or character-string memory table contents change due to the
touch switch operation on the NT620S/620C. (The contents of the word to
which the numeral or character-string table has been allocated also change.)
Word 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0 Bit
Screen No. (4-digit BCD)
Screen being displayed
Content upgrade
memory table
Numeral memory table No. (3-digit BCD)
PT status
PT status
m
m+1
m+2
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
Page 3: ...iv...
Page 5: ...vi...
Page 328: ......
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