5502A
Operators Manual
5-32
Commands for RS-232 Only
The RS-232 checkbox shows RS-232 interface commands.
The IEEE-488 and RS-232 interfaces send commands to the Calibrator as data, but not
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
put the 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 with the IEEE-488 Standards. The relationship between these IEEE-488
messages and the equivalent RS-232 emulation is shown in Table 5-6.
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” in this chapter.
With the commands and special characters that emulate the IEEE-488 functions shown
above, there are more commands that are related to operation and control of the actual
RS-232 Host port and these are unrelated to IEEE-488 operations. These include the
subsequent six commands.
SP_SET SPLSTR SRQSTR
SP_SET? SPLSTR? SRQSTR?
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