B-Readingsource - Keithley 486 Instruction Manual

SECTION 4
IEEE-488 Reference
4.2.2
B - Reading Source
Purpose
To select the source of data (A/D converter or data store) that is transmitted over the bus.
Format
Bn
Parameters BO Select A/D converter readings for output to bus
Bl Select single data store reading for output to bus
82 Select all data store readings for output to bus
83 Select miudmum value reading in data store for output to bus.
B4 Select minimum value reading in data store for output to bus.
Programming
Notes
Programming
Examples
Upon power-up or after receiving a DCL or SDC command, the instrument returns to the op-
tion of the B comman d that was saved as the default condition.
With this command, the user has a choice of data from the A/D converter or the buffer (data
store). When in BO, A/D readings will be sent. In a continuous trigger mode, readings will be
updated at the conversion rate. The Bl co mmand is used to access single readings from the
buffer. When the Bl co mmand is sent, subsequent readings will be taken from consecutive
buffer locations beginning with the first memory location @Ol). Once all readings have been
taken, the instrument will not send any more readings until another B command is received or
another data store operation is started.
The B2 command allows you to dump the entire data store contents to the computer in one op
eration. Individual ASCII readings will be separated by commas.
The 83 command allows you to send the madmum reading from the data store buffer to the
computer, while the B4 command is used to obtain the minimum reading.
1.
2.
3.
10
20
30
40
The programmed terminator and EOI will be asserted at the end of the complete dump-
not after each reading as is the case with Bl.
In Bl or BZ, nothing will be transmitted over the bus until data is stored in the data store.
The selected data format (see G command) will apply to each reading sent over the bus to
the controller.
REMOTE 722
OuTPLrl- 722; "Box"
E!NTER722;A$
FRINTAS
l7.m
50 OlYY
! Select A/D reading mode.
! Acquire reading from 4&36/487.
! Display reading on CRT.
47