Fluke 8840A User Manual

Remote Programming
INPUr SyNrAX
"F3 ? F4" Correct construction. The'8840A is con-
figured in F3, and the trigger is executed.
Then the 884OA is left in
F4.
3-40. OUTPUT DATA
The following paragraphs describe the data that can be
loaded into the 8840A output buffer and sent to the
IEEE-488 bus. The paragraphs describe how and when
data is loaded into the output buffer, the types of output
data, and their relative priority.
Note that the
8WA
can also send data to the IEEE-488
bus from the serial poll register. For a description of this
data, see paragraph 3-50.
3-41. Loading Output Data
The output buffer is loaded when the 8840A receives an
output command, or when an error occurs. Output com-
mands are those device-dependent commands which load
the output buffer with data:
Get commands (GO through G8)
Single-trigger command (?)
Group execute trigger (GET)
Continuous Trigger (TO)
Because the 8840A gives priority to input processing, it
completely processes all characters in the input buffer
before it loads the output buffer. When the output buffer is
loaded, the Data Available bit
in the serial poll register is
set true.
Data from the output buffer is not actually loaded onto the
IEEE-488 bus until the controller addresses the
8840A as a
talker. This is done by sending the interface message
MTA
(My Talk Address).
342. Types of Output Data
The types of data that can be loaded into the output buffer
are- shown in Figure 3-6. Each type has its own format.
Error messages, which are loaded into the output buffer if
an error occurs, are formatted as numeric data.
3-43. Numeric Data and Error Messages
Numeric data is loaded into the output buffer in response
to the
G2 command 01 an instrument trigger, and has the
1 RANEE
format shown in Table 3-2. The exponent is always a
multiple of
3, as in engineering notation. The positiidn of
the decimal point matches the front panel display.
Numeric data is of constant length, It is
11 characters @lus
terminators3 when the suffix is disabled, and 16 characters
(plus terminators) when the
suffi is enabled.
The suffix is enabled by the
Y1 command, and consists of
five ASCII characters
as shown in Figure 3-6. The $@fix
is appended only to numeric data, never to status data. The
terminators are determined by the Terminator commands.
The default is
CR LF EOI.
There are three types of numeric
data: measurement data,
overrange indication, and error messages.
3-44. MEASUREMENT DATA
Measurement data has the numeric data format showtl in
Table 3-2, and is always
in the units of volts, amps, or
ohms.
NOTE
In the fast (F) reading rate, the leart signifi-
cant digit
is always zero, and should be dis-
regarded when interpreting accuracy
specifications.
3-45. OVERRANGE INDICATION
If a reading is overrange (r200,OOO counts), the measure-
ment data
has the following format:
Overvoltage readings
(> lOOOV dc or 700V ac) do not
result
in this display.
3-46.
ERROR MESSAGES
If the 884OA detects an error, it loads an error message
into the output buffer in the following numeric format:
+1,00xxE+21 <terminatorY
The digits xx represent a two-digit error code. (Error ccrdes
are listed in Table 2-1, Section
2.) The suffix is always
suppressed for error messages.
Table 3-2. Numeric Output Data Format
MEASUREMENT DATA
-
OVERRANGE
INDICATION
&.99999E+9
ERROR
MESSAGES
+I .OOxxE+21
mA DC, mA AC
--
VDC, VAC 2-, 4-WIRE kR
tl xx.mE+O
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Fluke 8840A Specifications

General

Frequency Range	20 Hz to 100 kHz
Operating Temperature	0°C to 50°C
Display	Vacuum Fluorescent
DC Current Range	0 to 2 A
AC Current Range	0 to 2 A