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SECTION 4
GPIB Interface
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Table 4-5.
Response to Interface Messages
IFC
(Interface Clear)
DCL
(Device Clear)
or
Initializes the GPIB Interface.
(Cancels Listener or Talker)
Resets an error.
Clears the transmit and receive buffers of the GPIB.
SDC
Holds the issue of SRQ.
(Status byte is reset.)
(Selective Device Clear)
Inhibits the issue of SRQ.
(Equivalent
to "RQ 0")
Inhibits the header output. (Equivalent
"HD 0")
Resets the wait state for end of measurement
in manual trigger mode.
GTL
(Go To Local)
Establishes
the local mode.
GET
(Group Execute Trig)
Starts measurement
(Same as trigger by program code)
Once trigger is applied by the GET command, the next GET command
is ignored until the end of measurement.
4.3.7
Response to Interface Messages
4.3.8
Remote/Local
Operation
Remote
The response to the interface messages of the instrument
are provided by Table 4-5.
Notes:
1. Display parameter
and frequency do not change by
the IFC command. The IDC command is valid for all
the devices connected to the bus.
2. Though
the GET command
is invalid in the local
mode, the DCL and SDC commands are valid in the
local mode.
3. The SDC, GTL and GET commands
are in the ad-
dress command group (see Table 4-l). Thus, they are
valid only when the instrument is programmed
as a
listener. On the other hand, the DCL command is in
the universal
command group, and is always valid
for all devices provided with the device clear func-
tion.
When the instrument
is assigned as a listener when the
REN message is true (REN line = Low: l), the remote
mode is established,
and the REMOTE light on the front
panel turns on. In the remote mode, operation over the
GPIB is possible, and the key entry from the front panel
(except for error reset) is invalid. Although
a measure-
ment is not interrupted when the transition from local to
remote is made, the auxiliary setting mode (SET UP) is re-
set (EXIT).
Local
When the REN message becomes false (REN line = High:
0) or when the instrument
receives the GTL command,
the local mode is established,
and the REMOTE
light
turns off. In the local mode, the settings from the front
panel are enabled, and the GPIB program codes are ig-
nored. The GET command is also invalid. Measurement
cannot be interrupted when the remote mode is changed
to the local mode.
4-10
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