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To return the CL3001 to the local with lockout state, send
the RS-232 LOCAL command or the IEEE-488 GTL (Go To
Local) message.
Table 4 summarizes the possible operating state transitions. For
more information on IEEE-488 GPIB messages, see section 9.5.
Table 4 - Operating State Transitions
From
To
Front Panel
GPIB Message
Serial Command
Local
Remote
MLA (REN True)
REMOTE
Local with Lockout
LLO
LOCKOUT
Remote
Local
Local 0 key
GTL or REN False
LOCAL
Remote with Lockout
LLO
LOCKOUT
Local with
Local
REN False
LOCAL
Lockout
Remote with Lockout
MLA (REN True)
REMOTE
Remote with Local
REN False
LOCAL
Lockout
Local with Lockout
GTL
9.5 IEEE-488 Interface Overview
The IEEE-488 parallel interface sends commands as data and
receives measurements and messages as data. The maximum data
exchange rate is 1 Mbyte per second, with a maximum distance of
20 meters for the total length of the connecting cables. A single
cable should not exceed 4 meters in length.
Several commands are used only for RS-232 serial operation
because these functions must be implemented as IEEE uniline
(single control line) bus management messages per the IEEE
Standards. For example, the command REMOTE could be sent as
data over the IEEE-488 interface to place the CL3001 into remote
operating mode, but it is not because the IEEE Standards call for the
remote function to be sent to the device as the uniline message
REN. This is also true for several other commands and functions, as
shown in table 5 below with their RS-232 equivalents.
Table 5 - RS-232 Emulation of IEEE-488 Messages
IEEE-488 Message
RS-232 Equivalent
GTL
LOCAL command
GTR
REMOTE command
LLO
LOCKOUT command
SDC, DCL
(not emulated on RS-232)
GET
(not emulated on RS-232)
SPE, SPD
(not emulated on RS-232)
UNL, UNT
(not emulated on RS-232)
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