Fluke 5522A - Remote with Lockout State; RS-232 Interface Overview

Remote Operations
RS-232 Interface Overview 5
5-21
The left side of the Control Display shows information regarding the present output
function. However, front panel operation is restricted to use of the power switch and the
"Go To Local" softkeys. Pressing either of these softkeys, using RS-232 to send the
command LOCAL, or IEEE-488 to send the GTL (Go To Local) message returns the
Calibrator to the local state.
Remote with Lockout State
When the Calibrator is placed in lockout, either via RS-232 LOCKOUT command, or via
the IEEE-488 message LLO, the Calibrator front panel controls are totally locked out. In
remote with lockout, the Control Display changes to:
nn325f.eps
The left side of the Control Display shows information regarding the present output
function. However, front panel operation is restricted to use of the power switch. To
return the Calibrator to the local with lockout state, send the RS-232 LOCAL command
or the IEEE-488 GTL (Go To Local) message.
Table 5-1 summarizes the possible Remote/Local state transitions. (For more information
on IEEE-488 GPIB messages, see “IEEE-488 Overview.”
Table 5-1. Operating State Transitions
From To Front Panel GPIB Message Serial Command
Remote MLA (REN True) REMOTE
Local
Local with Lockout LLO LOCKOUT
Local Go to Local Softkey GTL or REN False LOCAL
Remote
Remote with
Lockout
LLO LOCKOUT
Local REN False LOCAL
Local with Lockout
Remote with
Lockout
MLA (REN True) REMOTE
Local REN False REMOTE
Remote with
Lockout
Local with Lockout GTL
RS-232 Interface Overview
The two Calibrator RS-232 ports are designed in accordance with EIA (Electronic
Industries Association) standard RS-232. RS-232 is a serial binary data interchange
operating from 300 to 9600 baud (selectable), and distances up to 50 feet. The Calibrator
rear panel SERIAL 1 FROM HOST port is configured as DTE (Data Terminal
Equipment) while the SERIAL 2 TO UUT is configured as DCE (Data Communications
Equipment). See Appendix C for RS-232 cable and connector information. For detailed
information, see the EIA standard RS-232.
A summary of RS-232 terms, interface lines and mnemonics are shown in Table 5-2.