Tektronix FG 5010 User Manual

Programming
- FG
5010
MESSAGES AND COMMUNICATION
PROTOCOL
Command
Separator
A
message
consists
of
one command
or
a series
of
com
mands , followed by a message terminator . Commands in
multiple command messages must be separated by
semicolons
. A
semicolon at the end of
a
message is option
al . For example , each line below is a message .
INIT
TEST ; INIT ; RQS ON ; USER OFF ; ID ?; SET ?
TEST ;
Message
Terminator
Messages
may be
terminated
with EOI
or the
ASCII line
feed ( LF ) character . Some controllers assert EOI concur
rently with the last data byte ; others use only the LF charac
ter as a terminator . The instrument can be set to accept
either terminator . With EOI only selected as the terminator ,
the instrument interprets a data byte received with EOI as
serted as the end of the input message ; it also asserts EOI
concurrently with the last byte of the output message . With
the LF / EOI setting , the instrument interprets the LF charac
ter without EOI asserted ( or any data byte received with EOI
asserted ) as the end of an input message ; it transmits car
riage return ( CR ) followed by line feed ( the LF with EOI as
serted ) to
terminate
output
messages .
A set of six address and message terminator switches is
located on the
CPU board
and is
accessible through a
cutout in the rear panel of the FG 5010. ( Simply remove the
instrument from Power Module for access . ) Five of the
switches are user set to select the primary address of the
FG 5010. One switch is user set for the instrument to re
spond to one of two possible message delimiters ( LF / EOI ,
or
EOI ) that may
be sent over
the bus by various
controllers
.
Selection of the primary address bits and message termina
tor is accomplished as shown in Fig . 3-3 . ( Switches 1
through 5 can
be set to any
address between and 31. All
FG 5010 instruments are shipped with EOI only selected . ) .
Formatting A Message
Commands sent to TM 5000 instruments must have the
proper
format
( syntx ) to be
understood ;
however , this for
mat is flexible in that many variations are acceptable . The
following describes the format and the acceptable
variations
.
The instruments expect all commands to be encoded in
ASCII , with either upper or lower case ASCII characters
acceptable . All data output is in upper case ( see Fig . 3-4 ) .
3-26
EOI ONLY =
PRIMARY
ADDRESS
Push to left for
logic .
Push to right
for logic 1 .
SP
IEEE - 488
ADDRESS
SELECTION
A5
A4
A3
A2
A1
¸RQSON ;
SP
SPUSEROFF
IÁÁÁ
SP SP
LF / EOI
CR
LF
16
8
4
2
1
=
1
Fig . 3-3 . Address and message terminator switches .
As
previously
discussed
, a
command
consists of a
head
er
,
followed
, if
necessary , by
arguments . A
command with
arguments must have a header delimiter , which is the space
character ( SP ) between the header and the argument . The
space
character ( SP ) ,
carriage return
( CR ) , and
line feed
( LF ) are shown as subscript in the following examples .
RQS SPON
BINARY
WEIGHT
If
extra
formatting charcters SP
, CR , and LF
( the LF cannot
be used for format in the LF / EOI terminator mode ) are add
ed between the header delimiter and the argument , those
characters are ignored by the instrument .
SP
Example
1 :
Example
2 :
Example 3
:
RQS
ON ;
RQS
ON
;
RQS
SP
SP
SP CR LF
ON
3467-06
In general , these formatting characters are ignored after any
delimiter and at the beginning and end of
message
In the command list , some headers and arguments are
listed
in two forms
, a full - length
version and an
abbreviated
version . The instrument accepts any header or argument
containing at
least the
characters listed
in the short
form ;
any
characters
added to
the abbreviated
version
must
be
those given in the full - length version . For documentation of
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Tektronix FG 5010 Specifications

General

Brand	Tektronix
Model	FG 5010
Category	Portable Generator
Language	English