HP 5335A - Page 48

Operation and Programming
Table 3-4. 5335A Bus Message Usage
pi
Description
5335A Use
Sample 9825 Statements
{5335A Set to Address 83}
Sample 9835/45 Statements
(5335A Set to Address S3)
Data
Transfers device-dependent
information from one device
to one or more devices on
the bus.
Sends measurement data. See
paragraph 3-191 for output
format. Accepts program
codes. See Table 3-6 for
code set.
red 703, A
wrt 703, "FN9”
ENTER 703, A !
OUTPUT 703, “FN9"
Trigger
Causes a group of selected
devices to simultaneously
initiate a set of device¬
dependent actions.
Starts a new measurement. trg 7 or
trg 703
TRIGGER 7 or
TRIGGER 703
Clear
Causes an instrument to be
set to a predefined state (a
certain range, function, etc.)
Sames as front panel RESET.
Clears internal count and
starts new measurement.
Clears any Error condition.
clr 7 or
clr 703
CLEAR 7 or
CLEAR 703
Remote Permits selected devices to
be set to remote operation,
allowing parameters and
device characteristics to be
controlled by Bus Messages.
Causes counter to go to
remote operation if REN is
true and counter is addressed
to listen. In absence of pro¬
gram data, remote operation
is according to state of front
panel settings just prior to
going to remote. Locks out all
pushbuttons except Local
rem 7 or
rem 703
REMOTE 7 or
REMOTE 703
Local
Causes selected devices to
return to local (front panel)
operation.
Goes to local front panel
control. In absence of front
panel data, local operation is
according to the state of the
remote data just prior to
going to local. The following
states are invoked; WA0,
DR0, and SR0.
Icl 7 or
Icl 703
LOCAL 7 or
LOCAL 703
Local
Lockout
Disables local (front panel)
controls fo selected devices
Disables front panel RESET.
5335A remains in remote
Ho 7
LOCAL LOCKOUT 7 or
LOCAL LOCKOUT 703
Clear
Lockout
and Local
Returns all devices to local
(front panel) control and
simultaneously clears the
Local Lockout Message.
Local Lockout cleared and re¬
turns to local front panel
control.
Icl 7 or
Icl 703
LOCAL 7 or
LOCAL 703
Require
Service
Indicates a device’s need for
interaction with the con¬
troller.
Used to flag an error or fail
condition or indicate one of
several instrument specific
messages coded in status byte
rds(7)—A
if bit (7, A)
(bit 7=1 if SRQ true!
STATUS 703; A
Status
Byte
Presents status information of
a particular device; one bit
indicates whether or not the
device currently requires
service, the other 7 bits
(optional) are used to indi¬
cate the type of service
required.
Bit 7 is set if service is re¬
requested. Additionally, Bit 1,
2, 3, 4, 6, 7, or 8 may be set,
indicating a specific instru¬
ment condition or status, see
Table 3-7.
rds(7)—A
or
rds(703)—A
STATUS 703; A
FOR 1=7 TO 0 STEP - 1
PRINT I: BIT (A, 1}
NEXT 1
END
(sample program prints
status of Bits 1 through 8)
Status
Bit
A single bit of device
dependent status information
which may be logically com¬
bined with status bit infor¬
mation from other devices by
the controller.
Does not use
Pass
Control
Passes bus controller re¬
sponsibilities from the cur¬
rent controller to a device
which car assume the Bus
supervisory role.
Does not use
Abort
Unconditionally terminates
Bus communications and re¬
turns control to the system
controller.
Clears Talk, Listen, Serial Poll
Enable registers on 5335A HP-
1B Interface. Front panel set¬
up does not change.
cli 7 or
cli 703
ABORTIO 7
SWITCHES SHOWN WITH
ADDRESS = 03.
3-32
Modpf M.1«SA