HP 3478A Technical Manual page 29

3478A 3478A
Table 3-4. Status By Table 3-4. Status Byte Definitions te Definitions
O O c c t t a a l l D D e e c c i i m m a a l l B B i i t t
C C o o d d e e C C o o d d e e
0 0 0 0 1 1 1 1 0 0
0 0 0 0 2 2 2 2 1 1
0 0 0 0 4 4 4 4 2 2
0 0 1 1 0 0 8 8 3 3
0 0 2 2 0 0 1 1 6 6 4 4
0 0 4 4 0 0 3 3 2 2 5 5
1 1 0 0 0 0 6 6 4 4 6 6
2 2 0 0 0 0 1 1 2 2 8 8 7 7
Note: More than one bit in the Status Byte can be true Note: More than one bit in the Status Byte can be true
(see paragraph 3-87) (see paragraph 3-87). . is out
Data Ready bit is true). The only way the SRQ Message Data Ready bit is true). The only way the SRQ Message
is output is if the Front Panel SRQ condition is true. is output is if the Front Panel SRQ
3-87. More than one 3-87. More than one bit in the Status By bit in the Status Byte Message can
be true. be tr ue. For example, bit For e xample, bit 0, 2
(remember, bit 6 is true for any SRQ condition, if the (remember, bit 6 is true for any SRQ condition, if the
SRQ Mask is set for the condition) making the resultant SRQ Mask is set for the condition) making the resultant
Status Byte look like the following: Status Byte look like the following:
A "1" in this example shows a true condition. A "1" in this example shows a
D D e e f f i i n n i i t t i i o o n n s s
D D a a t t a a R R e e a a d d y y - - I I n n d d i i c c a a t t e e s s t t o o t t h h e e c c o o n n t t r r o o l l l l e e r r
that measurement data is ready to be that measurement data is ready to be
output. The Requir output. The Require Service e Service Message
and bit is cleared when the controller and bit is cleared when the controller
begins to accept the data or when the begins to accept the data or when the
reading is is no reading no longer longer available. available.
paragraph 114. paragraph 114.
T T h h i i s s b b i i t t i i s s a a l l w w a a y y s s a a t t 0 0 ( ( 0 0 = = h h i i g g h h ) ) . .
S S y y n n t t a a x x E E r r r r o o r r - - T T h h i i s s s s h h o o w w s s t t h h a a t t a a n n
invalid Program Code(s) has been sent invalid Program Code(s) has been sent
to the to the 3478A (e.g. 3478A (e.g. F9). F9).
I I n n t t e e r r n n a a l l E E r r r r o o r r - - S S h h o o w w s s t t h h a a t t a a f f a a i i l l u u r r e e i i n n
the 3478A the 3478A is detected. is detected. This may be a This may be a
failure in the Self-Test Routine (see failure in the Self-Test Routine (see
paragraph 3-60 paragraph 3-60), the A/D Converter, or ), the A/D Converter, or
a checksum error in the Calibration a checksum error in the Calibration
RAM (checked every time a reading is RAM (checked every time a reading is
taken). taken). More More information information can
obtained by reading the 3478A's error obtained by reading the 3478A's error
register. See paragraph 3-120. register. Se e paragraph 3-120.
F F r r o o n n t t P P a a n n e e l l S S R R Q Q - - T T h h i i s s b b i i t t i i s s s s e e t t w w h h e e n n
the 3478A's Front Panel SRQ button is the 3478A's Front Panel SRQ button is
pressed. See paragraph 3-115. pressed. Se e paragraph 3-115.
I I n n v v a a l l i i d d C C a a l l i i b b r r a a t t i i o o n n - - W W h h e e n n t t h h i i s s b b i i t t i i s s
set, an attempt to calibrate the 3478A set, an attempt to calibrate the 3478A
has failed. has failed.
T T h h i i s s i i s s t t h h e e S S R R Q Q b b i i t t . . T T h h i i s s b b i i t t i i s s t t r r u u e e
only if a Require Service Message is only if a Require Service Message is
output. output.
P P o o w w e e r r - - O O n n S SR R Q Q - - S S h h o o w w s s
power-on power-on reset reset has has occurred. occurred.
paragraph 3-106. paragraph 3-106.
is output put (the (the Status Status Register's Register's
condition is true.
te Message can
0, 2, an , and 4 d 4 are t
NOTE NOTE
true condition.
3-88. 3-88. The byte The byte is output a
with the corresponding octal number of the example at 125 with the corresponding octal number of the example at 125
shown as follows: shown as follows:
Message
See See
3-89. 3-89. Status Status Bit.
Poll. The Status Bit Poll. The Status Bit is used only
not be confused with the bits in the Status Byte Message. not be confused with the bits in the Status Byte Message.
3-90. Pass 3-90. Pass Control.
capabilities. capabilities.
3-91. 3-91. Abort Abort (Interface
terminated (including the 3478A's Bus communication). terminated (including the 3478A's Bus communication).
Control is returned to the con Control is ret
not remove the 3478A from remote control. not remove the 3478A from remote control.
3-92. 3-92. 3478A 3478A Addressing
can be be
3-93. HP-IB requires that each dev 3-93. HP-IB requires that each device on the Bus needs to be
identified as a Listener or a Talker, in order to execute the identified as a Listener or a Talker, in order to execute the
Bus Messages and commands. Bus Messages
has its own unique "listen" has its own
the 3478A is set by the Address Switch on its rear panel. the 3478A is set by the Address Switch on its rear panel.
Setting the 3478A's Listen Address also sets its Talk Address. Setting the 3478A's Listen Address also sets its Talk Address.
3-94. 3-94. The address switch is an The address switch is an eight section "DIP" sw
five sections five sections used for
Table 3-5. The allowable ad Table 3-5.
Table 3-5. Table 3-5.
decimal 23 (refer to Section II of this manual for the switch decimal 23 (refer to Section II of this manual for the switch
t th h a a t t a a
setting). setting).
See See
3-95. Instrument addr 3-95. Instrument address commands (sent by
are usually in this form: universal unlisten, device talk, device are usually in this form: universal unlisten, device talk, device
listen. The universal listen. The universal unlisten command re
from the Bus to allow only the addressed listener(s) to receive from the Bus to allow only the addressed listener(s) to receive
data. data. The data is sent by The data is sent by a talker which is designated
device talk command. device talk command.
are true rue
3-96. Talk- Only 3-96. Talk- Only Mode (No
3-97. The 3478A's 3-97. The 3478A's Talk-Only Mode allow
send measurement data to an external device (like a printer) send measurement data to an external device (like a printer)
without without a Bus controlle a Bus controller. r. The multimeter is p
Talk-Only Mode by setting the five address switches (on the Talk-Only Mode by setting the five address switches (on the
rear panel "DIP" switch) to 1 (set only the five address rear panel "DIP" switch) to 1 (set only the five address
switches switches to the to the up position
output a output after each fter each trigger.
selected from the front panel. selected from the front panel.
3-10 3-10
is output as shown in the s shown in the previous example
Bit. The 3478A does The 3478A does not respond
is used only for Parallel Poll and should for Parallel Poll and should
Control. The 3478 The 3478A does A does not h
(Interface Clear). Clear). All All HP-IB
urned to the controller. troller. The Abort Message does
Addressing
ice on the Bus needs to be
and commands. Because of this, Because of this, each device
unique "listen" and "talk" address. and "talk" address. The address of
eight section "DIP" switch with
used for addressing. addressing. The switch
The allowable address settings a dress settings are also listed
The factory address set The factory address setting o
ess commands (sent by the controller)
unlisten command removes all listeners
a talker which is designated by the
Mode (No Controller) Controller)
Talk-Only Mode allows the multimeter to
The multimeter is placed into t
up position). ). Measurement data is Measurement
trigger. Function an Function and range set
TM 11-6625-3071-14 TM 11-6625-3071-14
previous example
not respond to a Parallel to a Parallel
not have cont ave controller roller
HP-IB communication communication is is
The Abort Message does
each device
The address of
itch with
The switch is shown in is shown in
re also listed in in
ting of the f the 3478A is 3478A is
the controller)
moves all listeners
by the
s the multimeter to
laced into the he
data is then then
d range settings are tings are