HP 5355A - Page 42

Model 5355A
Operation and Programming
Table 3-7, 5355A Bus Message Usage
Message
Description 5355A Use
Sample 9825 State¬
ments (5355A Set to
Address §2)
Data
Transfers device-dependent infor¬
mation from one device to one or
more devices on the bus.
5345A sends measurement data via
its talk output. 5355A is controlled
by program codes. See Table 3~9
for code set.
red 702, A
wrt 702, "PRHD1T”
Trigger Causes a group of selected devices
to simultaneously initiate a set of
device-dependent actions.
Starts a new measurement. trg 7 or
trg 702
Clear
Causes an instrument to be set to a
predefined state (a certain range,
function, etc.).
Preset code PR presets 5355A to
power-up condition and triggers
one measurement.
wrt 702 "PR”
Remote
Permits selected devices to be set to
remote operation, allowing para¬
meters and device characteristics to
be controlled by Bus Messages.
5355A: goes to remote if REN is true
and addressed to listen. In absence .
of program data, remote operation
is according to the state of the front
panel settings just prior to going to
remote
rem 702
Local
Causes selected devices to return to
local (front panel) operation.
5355A goes to local front panei con¬
trol. In absence of front panel data.,
local operation is according to the
state of the remote data just prior to
going to local.
Id 702
Local
Lockout
Disables local (front panel) controls
of selected devices.
Disables front panel control. 5355A
remains in remote. ||||i||
llo 7
Clear ■
lockout
and Local
Returns ail devices to focal (front
panel) control and simultaneously
clears the Local Lockout Message,
Local lockout cleared and returns
to local front panei control.
Id 7
Require
Service
Indicates a device’s need for inter¬
action with the controller.
None
.,—
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 indicate the
type of service required.
None (refer, to Table 3-10 for status
display).
Status Bit
A single bit of device-dependent
status information which may be
logically combined with status bit
information from other devices by
the controller.
None
Pass Control
Passes bus controller responsi¬
bilities from the current controller
to a device which can assume the
Bus supervisory role. ;
None
Abort
Unconditionally terminates Bus
communications and returns con¬
trol to the system, controller.
5355A unlistens. .
cli 7
3-20