REMOTE OPERATION
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Preparing the instrument for remote operation
Introduction
The 2026 MultiSource Generator can be controlled remotely using either the RS
-
232 interface or
the GPIB (General Purpose Interface Bus) interface. The command set used is designed to comply
with IEEE 488.2. In RS
-
232 mode some IEEE 488.2 features are not implemented due to the
restrictions of the interface.
Programs to control the instrument remotely over the two interfaces have much in common, the
main difference being the way in which characters are transmitted.
Local lockout
In the remote mode the controller can set the instrument into Local Lockout state. When Local
Lockout is set the front panel is disabled and the [LOCAL] key is made ineffective. This state is
often used when the instrument is part of an automatic test system and left unattended. In this
state the instrument cannot be affected by operation of the front panel. The keyboard can only be
re
-
enabled by releasing Local Lockout over the remote interface or by switching the supply off
and on again.
Remote/local operation
When the instrument is addressed by the GPIB controller it will enter its remote mode and the
screen will display the [REM] annunciator at the lower right corner. Only one key, [Go To
Local], will have any effect. Pressing this key returns the instrument to normal manual operation,
unless Local Lockout (LLO) has been asserted by the controller.
When the instrument is addressed by the RS
-
232 controller, the remote mode is normally not
entered (and thus no [REM] annunciator appears on the screen), although RS
-
232 operation is
taking place.
In order to go to remote mode via the RS
-
232 it is necessary to transmit a control character (^A or
01H
−
connect or go to remote) following which the [REM] annunciator appears. Subsequently
pressing [Go To Local] or transmitting a control character (^D or 04H
−
disconnect or go to local)
will return the instrument to normal manual operation (unless Local Lockout has been asserted).
Remote operation selection
Remote operation can be selected between RS
-
232 and GPIB as follows:
(1) Press [UTIL] to display the Utilities Selection Menu 1 (if necessary, additionally press [Utils
Menu 1]).
(2) Press [Remote Control] to display the Remote Control Utility shown in Fig. 5
-
1 below.
B3475
Fig. 5-1 Remote control utility
(3) Select between GPIB and RS-232 operation by pressing the [GPIB/RS232] key which
toggles between the two selections as shown by the screen.
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General