5500A
Operator Manual
5-30
The IEEE-488 and RS-232 interfaces both send commands to the 5500A Calibrator as
data, except for those IEEE-488 functions that must be implemented as a message as
specified in the IEEE-488 standards. For example, the RS-232 interface uses the
command REMOTE to place the 5500A Calibrator in the remote mode. Although the
IEEE-488 interface could also send a command REMOTE as data, it does not because
this is one of the functions that must be implemented per IEEE-488 Standards.
The relationship between these IEEE-488 messages and the equivalent RS-232
emulation is shown in Table .
Table 5-6. Commands for RS-232 Only
IEEE-488 Message [1] RS-232 Equivalent
GTL LOCAL command
GTR REMOTE command
LLO LOCKOUT command
SRQ SRQSTR command
SDC, DCL ^C (<Cntl> C) character [clear the device]
GET ^T (<Cntl> T) character [execute a group trigger]
SPE, SPD ^P (<Cntl> P) character [print the serial poll string]
[1] See “How IEEE-488 Operates” later in this chapter.
In addition to the commands and special characters that emulate the IEEE-488 functions
shown above, there are several more commands that are related to operation and control
of the actual RS-232 Host port and are therefore completely unrelated to IEEE-488
operations. These include the following six commands.
SP_SET SPLSTR SRQSTR
SP_SET? SPLSTR? SRQSTR?
5-35. Commands for IEEE-488 Only
Commands that are used for the IEEE-488 interface are identified in the command
graphic by checking the
IEEE-488
x
check box. This is all the commands, except for
those used for RS-232 operations. (See “Commands for RS-232 Only.”) All commands
are transferred over the IEEE-488 as data, except for the commands LOCAL, REMOTE,
and LOCKOUT, which are implemented per IEEE Standards as messages
(see Table 5-7).
Table 5-7. Commands for IEEE-488 Only
IEEE-488 Message [1] Command Representation
GTL LOCAL command
GTR REMOTE command
LLO LOCKOUT command
SDC, DCL Clear the device
GET Execute a group trigger
SPE, SPD Print the serial poll string
[1] See “How IEEE-488 Operates” later in this chapter.
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