Fluke 6062A - Page 75

Table
2-13.
Interlace
Mode Commands
COMMAND DESCRIPTION
COMMAND STATUS
"EM" Error Mode
1
~
on, 0
=
off
"RM" Record Mode
1
=
on, 0
=
off
"TM" Select Terminator
1
=
CR,
0
=
LF
"UM"
Unbuffered Mode
1
=
on,
0
s
off
"VM" Valid
Mode
1
=
on, 0
-
off
The error mode selects when the IEEE-488
rejected entry status is cleared. If turned
on, the
error status is cleared
when a new message is processed. If turned off,
the status is cleared only
when interrogated with the “IR” (interrogate
rejected entry) command or when explicitly
cleared with the “CE” (clear
error command).
The record mode selects whether
the message unit is a record or
a
command.
When turned on,
the message unit
is a record. When turned off, the message
unit is a command.
The terminator mode selects
the character used as the record terminator.
The terminator
character is
not used for command processing unless
the record mode is enabled. When turned
on, the record terminator CR
(carriage return) is used. If turned off,
the
record
terminator LF
(line feed)
is used. The record terminator character is
the last character in all IEEE-488
messages sent from the Generator.
The unbuffered
mode selects when messages
from
the IEEE-488
interface are processed. When
turned on, messages are read
from the IEEE-488 interface only when
the microprocessor is
ready to process
them. In this mode, the input buffer will
contain a maximum of one message.
(A
message may be one command
or one record, depending on the setting of the
record mode.)
When turned off, messages
are read from the IEEE-488 Interface
to the input buffer of the
Generator
at the fastest rate. In this mode,
the input buffer may contain
up to 80
characters.
The valid
mode selects when messages are
processed by the Generator microprocessor. When
the valid
mode is turned on, processing
of a new message is begun only after the
RF output has
settled and become valid. When
the valid mode is turned off,
a new message is processed
immediately
after the completion of the previous
message.
The interface modes can
also
be programmed
using the command,
“(5)”
n (where n
is
an
integer).
The interface modes are
set to the value of n, where n is the
sum of the codes for the
desired modes. The integer
codes for the interface modes
that can be programmed using the
n commands
are as follows:
Terminator Mode=
I
Record
Mode
=
2
Valid
Mode
=
4
Unbuffered Mode=
8
Error
Mode
=
16
For
example, to select the
record mode and valid mode, the
command is 6.
Interface
Mode Example:
In this example,
the RF output of the Generator
is connected to a circuit that is being
measured
by a voltmeter. The
output of the Generator must
be settled before
the
voltmeter is given
the command to make a measurement.