HP 3478A Technical Manual page 121

3478A 3478A
h. h. Require Service Require Service: A device can send this
message at any time to signify the device needs some message at any time to signify the device needs some
type of interaction type of interaction with the controller. with the controller. This message is
cleared by the device's STATUS BYTE message if the cleared by the device's STATUS BYTE message if the
device no longer requires service. device no longer requires service.
i. i. Status Byte Status Byte: A byte that : A byte that represents the current
status of a single d status of a single device on the HP-IB. evice on the HP-IB. One bit indicates
whether the device sent the whether the device sent the require sevice message and
the remaining seven bits indicate optional conditions the remaining seven bits indicate optional conditions
defined by the device. defined by the device. This byte is sent f This byte is sent from the talking
device in response to a "Serial Poll" device in response to a "Serial Poll" operation performed
by the controller. by the controller.
j. j. Status Bit Status Bit: A byte that : A byte that represents the
operational conditions of a group of devices on the HP- operational conditions of a group of devices on the HP-
IB. IB. Each device responds Each device responds on a particular bit of
thus identifying a device dependent thus identifying a device dependent condition.
typically sent by devices in response to a parallel poll typically sent by devices in response to a parallel
operation. operation.
k. k. Pass Control: The bus management Pass Control
responsibility is transferred from the active controller to responsibility is transferred from the active controller to
another controller by this message. another controller by this message.
I. I. Abort: The system controller sends this Abort : The system controller sends this
message to unconditionally assume control of the HP-IB message to unconditionally assume control of
from the active controller. from the active controller. The message will term
bus communication but does not implement the CLEAR bus communication but does not implement the CLEAR
message. message.
A-16. A-16. 3478A 3478A Bus Bus Capabilities Capabilities
A-17 A- 17. . Th The 3 e 347 478A 8A in inte terf rfac
: A device can send this
This message is
represents the current
One bit indicates
require sevice message and
rom the talking
operation performed
represents the
on a particular bit of the byte
condition. This bit is This bit is
: The bus management
the HP-IB
The message will terminate all
aces es to to th the H e HP- P-IB IB as as de
by the IEEE Standard 488-1978. by the IEEE Standa
subset which the 3478A implements is specified in Table subset which the 3478A implements is specified in Table
A-1 . A-1 .
SH1 1 SH
AH AH1 1
T5 T5
T T E E O O
L L 4 4
L L E E O O
SR SR1 1
RL RL1 1
PP PPO O
the byte
DC1 1 DC
DT1 1 DT
poll
C C O O
A A - - 1 1 8 8 . .
The HP-IB worksheet (Table A-2) can be used to The HP-IB worksheet (Table A-2) can be used to
determine the HP-IB capabilities of the other HP-IB determine the HP-IB capabilities of the
compatible instruments in a system. compatible instrume
filled in with the bus message applicability for your filled in with the bus message applicability for your
inate all
controller and for controller and for each HP-IB device.
for the 3478A ha for the 3478A has already b, en filled in.
controller manual and the manual(s) of controller manual and the manual(s) of your other
device(s) for t device(s) for their Bus Message cap
sheet is filled out, you should then have the HP-IB sheet is filled out, you should then have the HP-IB
capabilities of your device(s). capabilities of your device(s).
defi fine ned d
A-3 A-3
rd 488-1978. The interface funct
Table A-1. 1. 3476A Device Table A- 3476A Device Capability
Sour urce So ce Ha Hand ndsh shak ake e co comp
Acce Ac cept ptor or Ha Hand ndsh shak ake c e com
Ba Bas s ic ic t t al alke ker r , w , wit ith s h ser eria ial p
mode, and unaddress with MLA. mode, and unaddress with MLA.
N N o o e e x x t t e e n n d d e e d d t t a a l l k k e e r r
B B a a s s i i c l c li i s s t t e e n n e e r r , u , un n a a d d d d r r e e s s s w
N N o e o ex x t t e e n n d d e e d l d li i s s t t e e n n e e r r
Se Serv rvic ice e re requ ques est t co comp mplet
Re Remo mote te-L -Loc ocal c al com ompl plet ete c
No pa No para rall llel el po poll ll ca capa pabi bili lity ty
De Devi vice ce Cl Clea ear co r comp mple lete te ca
Devi vice De ce Tr Trig igge ger co r comp mple lete te ca
N N o c o co o n n t t r r o o l l l l e e r c r ca a p p a a b b i i l l i i t t y y
H H P P - - I I B W B Wo o r r k k s s h h e e e e t t
nts in a system. The sheet may be
each HP-IB device. The bus capability
s already b, en filled in. Refer to your
heir Bus Message capabilities.
TM 11-6625-3071-14 TM 11-6625-3071-14
The interface functional ional
Capability
mple lete te ca capa pabi bili lity ty
ompl plet ete c e cap apab abil ilit ity y
l pol oll, l, t t al alk o k onl nly y
s wh h e e n M n MT T A A
lete e ca capa pabi bilit lity y
e cap apab abil ilit ity y
capa pabi bili lity ty
capa pabi bili lity ty
other HP-IB
The sheet may be
The bus capability
Refer to your
your other
abilities. Once the Once the