6-2
Section
Outline of Communications
248
In the format, parentheses are used to indicate parts that can under some cir-
cumstances be omitted, and ** is used to indicate the ASCII code (two hexadeci-
mal digits) of the specified character.
In the explanations of commands, expressions such as “4 BCD digits” and “2
hexadecimal digits” are used to mean (respectively) “the ASCII character string
for a numerical value expressed as four BCD digits” and “the ASCII character
string for a numerical value expressed as two hexadecimal digits”, etc. Do not
specify BCD and hexadecimal data without alteration: always convert it into an
ASCII character string before transmission.
[Example]
The format for the numeral value memory table read command is shown below.
4E
* *
* *
* *
* *
1B
52
* *
N
m
t
1
t
2
t
3
[ESC]
R
t
4
(l
2
)
(s
1
)
(s
2
)
[CR]
(l
1
)
* *
* *
* *
0D
* *
The following parameters are specified in this format.
m
: 1 (1 BCD digit)
t
1
t
2
t
3
t
4
: 0123 (4 BCD digits)
l
1
l
2
: 99 (2 BCD digits)
s
1
s
2
: 24 (2 hexadecimal digits)
The character string actually transmitted is as shown below.
4E
31
30
31
32
1B
52
33
N
1
0
1
2
[ESC]
R
3
9
2
4
[CR]
9
39
32
34
0D
39
Reference
In the “Format” sections in the explanations for commands/responses, paren-
theses are used to indicate parts that can under some circumstances be
omitted, and ** is used to indicate the ASCII code (two hexadecimal digits) of the
specified character.
Processing differences according to command length
S
If a command is too long because it has been incorrectly specified, an error
response for a command length error is returned.
S
If a command is too short because it has been incorrectly specified, a commu-
nication error (time out) occurs.
Command transmission intervals
S
If commands are sent too frequently, processing at the NT620S/NT620C will
not be able to keep pace with them and a communication error (buffer overflow)
will occur.
S
Use the flow control to prevent a buffer overflow.
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...
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