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IEEE-488 PROGRAMMING
Table 4-26. Typical NRFD Hold-off
Times
4.9.19 Terminator
(Y)
Conditions
X TO X
Fl TO F5
F7 TO FO
R4 TO RO
SO,1 TO SO,1000
Sl,l TO Sl,lOOO
NO,1 TO NO,1000
Nl,.l
TO N1,.5
Gl TO G2
Hl TO HZ
DNRFD TO D
PO TO P2
T20,lOO TO T23, -100
02,O TO 02,l
BO TO Bl,lB2,50
QO TO Ql
ZO TO 23,100
IO TO I2
UO TO Ul
MO TO M4
A0 TO Al
Ll TO Ll
Cl To c2
KO TO Kl
Jl TO Jl
Hold-off
(msec)
132.8
132.8
163.2
146.2
210
143.4
159.7
85.8
92.9
77.8
212.7
184.4
459.7
182.6
120.7
202.4
145.4
92.0
92.0
641.2
1760
135.6
128
13920
HP-85
Programming
Example-Enter
the
following
statements to program the instrument
for the K2 mode:
The Model 194 will be placed in the K2 mode when the
second statement above is executed. The EOI mode will
be enabled, but the bus hold-off
will be disabled.
Model 8573 Programming
Example-To
place the instru-
ment in the K2 mode, enter the following
lines into the
IBM computer:
After the above statements are executed, the instrument
will be in the K2 mode. EOI will be enabled, but the bus
hold-off
mode will be disabled.
The terminator that marks the end of the instrument's
data
string or status words can be programmed
by sending the
Y command followed by sending the ASCII value or values
of the desired terminator or terminators (Table 4-V). ASCII
values may be found in Appendix
A. The default ter-
minator sequence is the commonly-used
carriage return.
line feed (CR LF) sequence (CR = ASCII 13; I.F=ASCll
10). The terminator
will assume this default value upon
power up, or after the instrument
receives a DCI. or SI)C
command.
Table 4-27. Terminator
Commands
*n and m art ASCll values of dcsircd characters.
The terminator
sequence can bc changed by sending the
Y command followed by the ASCIl values of desirrd unc
or two characters. However, the capital letters (A-Z) caw
not be used since they are used as crmmand
letters.
Typical commonly-used
sequences include:
1. M0,13X=(LF
CR)
2. Yl3,10X=(CR
LF)
3. M3X=(CR)
4. YlOX=(LF)
5. YX=(no
terminator)
NOTES:
1. Many controllers
use the default terminator
sequcnw
to end their input sequences. Modifying
the terminator
may cause the input sequence to hang unless ', diffwcnt
terminating
method (such as EOI) is used.
2. The terminator
sequence is sent only at the end of the
complete
transmission
scqucnce
regardless
of the
selected data format (67 does not ~st! the terminator,
however).
3. The programmed
terminator
affects both channels
simultaneously.
4. If EOI is enabled (paragraph 4.9.1X), it will be asserted
with the last terminator
byte, or with the last byte ot
data if the terminator
is disabled.
4-45
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