Terminator (Y); Execute (X) - Keithley 6512 Instruction Manual

IEEE-488 Programming

3.2.14 Terminator (Y)

Purpose
Format
Default
Description
Programming
Notes
Examples

3.2.15 Execute (X)

Purpose
Format
Description
Programming
Note
Examples
3-20
To program the terminator character(s) the Model 6512 adds to the end of its reading and status
strings.
Y<LF> <CR> <LF> <CR> (two terminator characters)
Y<CR> <LF> <CR> <LF> (two terminator characters)
Y<ASCII> ASCII character (except A-Z)
YX No terminator
Upon power-up, or after a DCL or SDC command, the terminator sequence is <CR> <LF>.
The terminator sequence that marks the end of the instrument's data string or status word can
be programmed by sending the Y command followed by an appropriate ASCII character. The
default terminator sequence is the commonly used carriage return, line feed (<CR> <LF>) se-
quence (<CR>=ASCII 13; <LF>=ASCII 10).
1. Capital letters A through Z cannot be used as terminator characters.
2. Programming non-standard terminators may cause the controller input sequence to hang up.
Y@X Program @ character as terminator.
YX Disable terminator.
To instruct the Model 6512 to execute device-dependent commands.
X
The execute command is implemented by sending an ASCII "X" over the bus. Its purpose is to
direct the Model 6512 to execute other device-dependent commands such as F (function) or R
(range). Usually, the execute character is the last byte in the command string (a number of com-
mands may be grouped together into one string); however, there may be certain circumstances
where it is desirable to send a command string at one time, and then send the execute character
later on.
Command strings sent without the execute character will be stored within an internal command
buffer for later execution. When the X character is finally transmitted, the stored commands will
be executed, assuming that all commands in the previous string were valid.
F0X Select DC volts function.
X Execute previous commands.