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2. Interface Functions
Remote, Local,
and Local Lockout
The analyzer can be in one of three states: power off, local (front panel) control, and remote control. Upon
power-up, the analyzer will automatically enter the local control state.
The R-2550 enters the remote control state upon detection that a remote device is trying to take control over the
RS-232 interface. Once in the remote control state the R-2550 executes commands input through the RS-232
interface.
The analyzer enters the remote control state upon detection that a remote device is trying to take control over
either the RS-232 or IEEE-488 interfaces. Once in the remote conuol state the analyzer executes commands input
through the remote control interface.
The only front panel controls available to the operator are:
power switch
l
squelch knob
l
brightness control knob
l
volume control knob
l
. "go to local" hard key
The Fl hard key functions as the "go to local" key while in the remote control state. A local lockout feature is
available when the analyzer is in the remote control state. The "go to local" hard key is not accepted while the
local lockout feature is enabled. The local lockout feature is disabled upon entering the remote control state.
The analyzer will remain in the remote conuol state until any of the following occtm
a "go to local" keystroke from front panel
l
detection of "go to local" from remote controller
l
power is switched off
l
The analyzer display indicates the unit is under remote control as long as it is in the remote control state. While
the local lockout feature is enabled the display indicates local lockout is enabled. An indication that the Fl key is
the "go to local" key is displayed if and only if the local lockout feature is disabled and the analyzer is in the
remote control state.
The analyzer will enter the local control state upon:
l
detection of the "go to local" command (GL) through the remote control interface
l
acceptance of a "go to local" keystroke from the front panel
l
Motorola Communications Analyzer
Programming Reference
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