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281, 282, 284
Users Manual
Introduction
The instrument can be remotely controlled via its RS232 or GPIB interfaces. When using
RS232 it can either be the only instrument connected to the controller or it can be part of
an addressable RS232 system which permits up to 32 instruments to be addressed from
one RS232 port.
Some of the following sections are general and apply to all 3 modes (single instrument
RS232, addressable RS232 and GPIB); others are clearly only relevant to a particular
interface or mode. It is only necessary to read the general sections plus those specific to
the intended remote control mode.
Address and Baud Rate Selection
For successful operation, each instrument connected to the GPIB or addressable RS232
system must be assigned a unique address and, in the case of addressable RS232, all must
be set to the same Baud rate.
The instrument’s remote address for operation on both the RS232 and GPIB interfaces is
set via the remote menu on the UTILITY screen.
REMOTE:
interface: RS232
address: 05
baud rate: 9600
With interface selected with the interface soft-key, the selection can be
toggled between RS232 and GPIB with alternate presses of the soft-key, the cursor
keys or by using the rotary control.
With address selected, the soft-key, cursor keys or rotary control can be used to set
the address.
With baud rate selected, the soft-key, cursor keys or rotary control can be used to
set the baud rate for the RS232 interface.
When operating on the GPIB all device operations are performed through a single
primary address; no secondary addressing is used. Note also that GPIB address 31 is not
allowed by the IEEE 488 standards but it is possible to select it as an RS232 address.
Remote/Local Operation
At power-on the instrument will be in the local state with the REMOTE lamp off. In this
state all keyboard operations are possible. When the instrument is addressed to listen and
a command is received the remote state will be entered and the REMOTE lamp will
illuminate. In this state the keyboard is locked out and remote commands only will be
processed. The instrument may be returned to the local state by pressing the LOCAL
key; however, the effect of this action will remain only until the instrument is addressed
again or receives another character from the interface, when the remote state will once
again be entered.
16-2
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