Remote/Local Control - Iwatsu VOAC760 Manual

2.6.4

Remote/local control

This instrument has all the remote and local functions defined in the IEEE Std. 488.1-1987 and JIS C
1901-1987. For details about transition of the remote and local modes, see the section, RL function, in
the specification.
a. Local mode
In the local mode, operation of the instrument is controlled through panel key operation.
The REMOTE LED is off.
This instrument enters the local mode when the power is turned on.
The following four kinds of methods are provided to return the mode from the remote mode to the
local mode (if the GP-IB interface is used).
 Turn off the power, and turn it on again.
 Set the REN line to "false" (electrically high level).
 Press the LOCAL ([SHIFT]) key.
 Set this instrument to listener and send the address command GTL.
b. Remote mode
In the remote mode, operation of the instrument is controlled by messages sent through the
interface. All panel key entries except for the LOCAL ([SHIFT]) key become invalid.
The REMOTE icon is lit during remote control.
To change the operation mode of the instrument from the local mode to the remote mode, it is
necessary to set this instrument to listener (MLA is received) with the REN line set at "true"
(electrically low level).
c. Local lock out mode
This instrument enters the local lock out mode in any of the following cases.
 The universal command LLO is received in the remote mode.
 The instrument enters the remote mode after the universal command LLO has been received.
In the local lock out mode, it is prevented that the mode is returned to the local mode even though
the operator presses the LOCAL ([SHIFT]) key.
The operation and response except for that the LOCAL ([SHIFT]) key input is ignored are the
same as those in the remote mode.
To return the instrument from the local lock out mode to the local mode, set the instrument to
listener and send the GTL message. However, when the mode is changed to the remote mode
again, the instrument enters the local lock out mode even though the LLO command is not
received newly.
To cancel the local lock out mode completely (to return to the remote mode), it is necessary to
temporarily change the mode to the local mode in any of the following manner.
 Turn off the power, and turn it on again.
 Set the REN line to "false" (electrically high level).
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