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291, 292, 294
Users Manual
Power-On Settings
The following instrument status values are set at power-on:
Status Byte Register = 0
Service Request Enable Register † = 0
Standard Event Status Register = 128 (pon bit set)
Standard Event Status Enable Register † = 0
Execution Error Register = 0
Query Error Register = 0
Parallel Poll Enable Register † = 0
† Registers marked thus are specific to the GPIB section of the instrument and are of
limited use in an RS232 environment.
The instrument will be in local state with the keyboard active.
The instrument parameters at power on are determined on the POWER ON SETTING
screen accessed from the UTILITY menu. If restore last setup or
recall store no. nn has been set and a defined state is required by the controller
at start up then the command
*
RST should be used to load the system defaults.
If for any reason an error is detected at power up in the nonvolatile ram a warning will be
issued and all settings will be returned to their default states as for a
*
RST command.
Remote commands
RS232 Remote Command Formats
Serial input to the instrument is buffered in a 256 byte input queue which is filled, under
interrupt, in a manner transparent to all other instrument operations. The instrument will
send XOFF when approximately 200 characters are in the queue. XON will be sent
when approximately 100 free spaces become available in the queue after XOFF was sent.
This queue contains raw (un-parsed) data which is parsed as it is required. Commands
and queries are executed in order and the parser will not start a new command until any
previous command or query is complete.
In non–addressable RS232 mode responses to commands or queries are sent
immediately; there is no output queue. In addressable mode the response formatter will
wait, indefinitely if necessary, until the instrument is addressed to talk and the complete
response message has been sent, before allowing the parser to start the next command in
the input queue.
Commands must be sent as specified in the commands list and must be terminated with
the command terminator code 0AH (Line Feed, LF). Commands may be sent in groups
with individual commands separated from each other by the code 3BH (semicolon). The
group must be terminated with command terminator 0AH (Line Feed, LF).
Responses from the instrument to the controller are sent as specified in the commands
list. Each response is terminated by 0DH (Carriage Return, CR) followed by 0AH (Line
Feed, LF).
<WHITE SPACE> is defined as character codes 00H to 20H inclusive with the
exception of those which are specified as addressable RS232 control codes.
<WHITE SPACE> is ignored except in command identifiers (thus, for example,
*
C LS
is not equivalent to
*
CLS.
The high bit of all characters is ignored.
17-10
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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