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General Characteristics
The MIREL RM1 speed recorder is equipment specifically designed for use on railway loco-
motives in all forms of tractive power. The RM1 secures three basic functions: measurement
of instantaneous speed, indication of instantaneous speed and additional information, regis-
tration of instantaneous speed and other operating and technical data in relation to a time
and route-independent scale.
The MIREL RM1 speed recorder is composed of a central processing unit, two indicator
devices and two identification devices located at the engineer's stations. The interconnection
of individual equipment is via a data line with serial data transmission. Alternatively the RM1
can be operated with only one indicator device or without one. The same applies for the
identification devices.
Power for the MIREL RM1 speed recorder is connected to the locomotive's battery source.
Configuration of the MIREL RM1 is dependent upon the voltage of the battery source. Ser-
vice of the speed recorder is performed exclusively from the engineer's station via the identi-
fication devices and control elements on the locomotive's control panel. Functionality of the
identification instrument may be integrated into the control unit of a cooperating system. No
entry into the locomotive's mechanical room or into the central processing unit of the equip-
ment is required to operate the MIREL RM1 speed recorder.
The MIREL RM1 speed recorder is an electronic digital system designed on the basis of the
latest electrical components where each instrument is controlled by a separate processor.
The components used in the central processing unit meet demanding criteria for reliability
and robustness. The central processing unit contains a processor module, power supply,
registration module, module for measuring frequency inputs and a module for galvanically
isolated digital inputs and outputs. The registration module is designed on the basis of large
capacity semiconductor memory chips that ensure the storage of data even if disconnected
from the locomotive's battery source for an extended period of time. The indication equip-
ment contains the actual pseudo-analogue indication instrument and a digital indicator of
instantaneous speed. The identification equipment comprises a 32-character alphanumeric
display and a 12-button keyboard.
The MIREL RM1 speed recorder performs regular self-diagnostics and enables the perfor-
mance of functional tests to re-test the correct functionality of all control system components
and locomotive equipment that works with it. The equipment is maintenance free apart from
performing functional tests.
