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4.3.11
Process Time
The data transfer rate is dependent
on the speed of the
controller,
and the process
time of the instrument
is
slower when making measurements.
Table 4-7 provides
the process time for standard program codes during non-
measurement
phases of operation.
The process time is
slightly different from parameter to parameter.
Table
4-7.
Process
Time of Program
Codes
(Reference
Data)
Setting Message
Inquky Message
Processing
Processing
Time
Time
Header
(Approx.)
Header
(Approx.)
DA
6ms
?DA
4ms
DB
5ms
?DB
4ms
CK
5ms
?CK
4ms
-
?DT
12ms
FR
7ms
?FR
5ms
LV
5ms
?LV
4ms
BO
5ms
?BO
4ms
TG
3ms
-
OP
3ms
-
SH
3ms
-
HD
4ms
?HD
4ms
RQ
4ms
?RQ
4ms
-
?ST
5ms
SECTION 4
GPIB Interface
+
The process times shown in Table 4-7 includes the fol-
lowing data transfer time:
Receive (to the instrument):
approx. 250ps/byte
Transmit (from the instrument):
approx. 120ys/byte
The process time for inquiry messages
is the time from
the start of program code reception to the completion
of
response message transmission.
When sending a header
for an inquiry,
add the following
value to the process
time:
0.5ms approx.
4.4
SETTING GPIB ADDRESS AND
DELIMITER
The GPIB address and delimiter can be checked and/or
changed from the front panel and summarized
as fol-
4-12
+
lows. For the detailed procedure, refer to paragraph 3.12
in Section 3.
GPIB Key -
By pressing and holding in this key for ap-
proximately three seconds, the current GPIB address and
delimiter will be displayed on them
DISPLAY.
The address and delimiter
values are separated
by the
decimal point. Valid address values are 0 to 30. Delimiter
values can be 0 (for <CR><LF>) or 1 (for <CR> only). Use
the I Z I - 8 key and ESR key to change the address value,
and use the G key to toggle the delimiter.
The displayed
address and delimiter
values can be en-
tered by again pressing
the GPIB key. The instrument
will return to the normal measurement
display state.
The entered
address
and delimiter
are retained
when
power is turned off. However, when they are lost due to a
memory error when power is turned on, they become de-
fault values (address = 2, delimiter = 0; <CR><LF>).
4.5
GPIB PROGRAMMING
Program codes which are used to control the instrument
or read the setting or measured data over GPIB are stored
in the 256-byte receive buffer, and interpreted
and exe-
cuted when the end of the program code is displayed.
The syntax of a program code is as follows.
<Header> < Parameter>
< Delimiter>
l
Header: Assigns a classification,
including
functions
and operation objectives.
l
Parameter : Indicates setting values and selection val-
ues. There are three types; NRl (integer representa-
tion), NR2 (floating-point
representation)
and NR3
(exponent representation)
l
Delimiter : <CR>, <LF>, etc. which indicates the end of
a program code.
For details on syntax, see paragraph 4.3.6.
When the instrument
is placed in the remote mode dur-
ing measurement,
and a setting or inquiry is performed,
the measurement
is interrupted.
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