FM Transmitter
Sistemas Electrónicos S.A EM 100 DIG
Technical Manual - v1.2 - November 2005 21
2.5 Commands and programming
EM-100 DIG allows an exhaustive control of all transmission parameters and a complete
programmability and monitoring through the various software controls via the front panel keyboard
and display.The same functions are remotely addressable with proper software, which is not included
as a standard option other than some simple demo programs.
For a description of remote capability see the proper section on the manual. In this section we will
examine the front panel menu-driven operational capability.
2.5.1 Passwords Organization.
The passwords organization is set in 3 security levels, each with its own password. A higher level
permits to change the lower levels authorizations and passwords.
The password is composed by 4 alphanumeric characters, including extended capital and
lowercase ones and several special symbols. We suggest using a wide range of characters as the
security level raises, to increase the possible combinations. No password is ever shown: it is always
masked by dummy characters as "...." or "****".
Nevertheless it may be always changed with the higher level authorization. Here is the purpose of
each level:
LEVEL 1: Lower security level. It is needed to access to most of the monitoring and control menu
screens, not permitting to alter or programming any operating parameter. It is set to "off" state as
default, allowing anybody to navigate freely through exciter's monitoring menu information. OMB
suggests leaving it in this state if a high "privacy" level is not required.
If set to ON, it will show the default menu screen #00, requiring password for any other information or
pre-set.
Failure to insert a correct password of any level will impede any other access to the commands for
the time-out length (usually 3 minutes). No change to the operational mode is done in case of
incorrect password input. No information is available on the display regarding the transmitter
functioning status.
LEVEL 2: Service level.This password is needed for any functioning set-up as frequency and power,
sensitivities, clock and date etc. Its use is reserved only to service technicians who need wide access
to the transmitter presets and functions.
Although the default factory state is "off", OMB suggests changing the default state and password
immediately at the first power on, to prevent to unauthorized people to tamper with transmitter
commands, if the default word is known or the status is set to "off".
LEVEL 3:Highest security level. It is always "on" by default and reset anyway to "on" after the display
time-out, for security purposes. Its knowledge is deserved only to very few people and must be
immediately registered after setup and kept in a secure place: there is no way to read it after you
have setup and confirmed on the exciter.
This password must be immediately changed at the first pre-set of the equipment: if any
unauthorized people tampers with it or you lose it, there is no way to change it if you do not know the
correct word for security reasons and the apparatus may become unmanageable.
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