Receiving The Trigger Message; Receiving The Clear Message; Receiving The Remote Message; Receiving The Local Message - HP 11713A Operating And Service Manual

Operation
Model 11713A
Receiving the Trigger Message
The Driver does not respond to the Trigger message.
Receiving the Clear Message
The Driver does not respond to the Clear message.
Receiving the Remote Message
The Remote message causes the Driver to switch
to the remote mode. The Remote message has two
parts: the remote enable (REN) and address-to-
listen. The Driver's outputs do not change with the
local-to-remote transition. The REMOTE LED
turns on when the Driver is in remote mode.
Receiving the Local Message
The Driver does not respond to the Local message.
When the Driver is in remote mode, it can be
returned to local mode with a Clear Lockout/Set
Local message.
'TheTron't parLel'LOCAL'kgy can alsoTetarn the ' '
D ri .
LOCAL key might interrupt a data message to the
Driver. This would leave the Driver in a state
unknown to the controller. This situation would be
undesirable arid is avoided by seRihg tHe Local .
Lockout condition which disables the LOCAL key.
Receiving the Local Lockout Message
The LOCAL pushbutton switch is disabled with
Local Lockout in effect. The Driver is returned to
local through program control by the controller.
NOTE
The Driver may also be returned to local
by turning the Driver LINE switch OFF
then ON, but this defeats the purpose of
the Local Lockout and the system con¬
troller loses control.
Receiving the Clear Lockout/Set Local
Message
The system controller sends a Clear Lockout/Set
Local message to clear the Local Lockout condi¬
tion and return all devices to local. No instrument
settings are changed when going from local lock¬
out (remote control) to local control.
Receiving the Pass Control Message
The Driver does not respond to the Pass Control
message because it cannot act as a controller.
Sending the Require Service Message
The Driver cannot send a Require Service Message.
Sending the Status Byte Message
The Driver does not respond to a serial poll and as a
result does not send the Status Byte message.
Sending the Status Bit Message
The Driver does not respond to a parallel poll and
as a result does not send the Status Bit message.
Receiving the Abort Message
The Driver stops listening when it receives the
Abort message. The Abort message is the means
by which the controller sets the Interface Clear
(IFC) bus line true.
OPERATOR MAINTENANCE
Operator maintenance is limited to replacement of
the rear panel fuse. The main ac line fuse isbcated
on the rear panel in the Line Power Module (see
.:.:..F4^u.^e^3-S.)..^^Q.-_i>eHaove--'th#4u-se74trs-t-i?e-m-ov€^he.
line power cable from its jack. Slide the fuse com¬
partment cover to the left, then pull the handle
. . marked.FUSE .PULL, and.,remove the. fuse.
\ warning"|
jBe
sure to select the correct fuse rating
for the selected line voltage. Do not use
repaired fuses or short circuited fuse-
holders. To do so could cause a shock or
fire hazard. Fuse ratings are listed on the
label attached to the Line Power Module.
CONNECTIONS TO 11713A ATTENUATOR
DRIVERS
Genera!
In the 11713A circuitry, each front panel ATTEN¬
UATOR X or ATTENUATOR Y pushbutton con¬
trols a pair of transistor drivers (see Figures 3-6
and 8-13). (The front panel pushbuttons are also
separately programmable.) While one transistor is
saturated and its output is grounded, the other
transistor is cutoff and floats at a high impedance.
A common 24V line provides the driving power for
the external devices. The devices controlled may
total up to ten if the total load current is equal to or
less than 650 mA. No one device may sink more
than 650 mA.
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