Adding Heart to Your Technology
Polar Electro Inc - OEM Division
Polar Electro Europe BV
1111 Marcus Avenue, Suite M15
Gotthardsstrasse 3
Lake Success, NY 11042-1034, USA
CH-6300 Zug, Switzerland
Tel. +1 516 364 0400
Tel. +41 41 727 1177
Fax. +1 516 364 5454
Fax. +41 41 727 1166
RMCM-01 RECEIVER COMPONENT - SPECIFICATIONS
Beat-to-Beat Output
format
The receiver module has 2
different output pins, HR and
FPLS.
The
HR
output generates a 1ms,
3V positive pulse after the receiver
has locked onto a code from a
coded transmitter. If no coded
signal is detected, the receiver will
determine that a non-coded
transmitter signal is present and
output the data on the HR pin.
FPLS
always generates pulses in
the same manner as Polar’s
standard OEM receiver modules.
All detected pulses are outputted.
For example, if a coded transmitter
is being used, there will be two
pulses (within 250ms) outputted.
Nominal pulse width is 6ms,
positive pulse, 3V.
The application where RMCM01
is connected should be able to
calculate the time between
incoming pulses and then use
suitable averaging to ensure the
best performance on outputted
heart rate.
System Description
A complete heart rate measuring system consists of a Polar
Transmitter worn around the chest and Polar RMCM-01
receiver built into the end user equipment. The Polar
Transmitter detects every heartbeat through two electrodes
with ECG accuracy and transmits the heart rate
information wirelessly to Polar RMCM-01 receiver with
the help of a low frequency electromagnetic field. The
RMCM-01 receiver receives the transmission, and passes a
digital pulse corresponding to each heartbeat to the end
user equipment electronics. The coils in the Polar
Transmitter and Polar RMCM-01 receiver must be aligned
parallel in order to gain optimum performance.
The end user equipment contains a microprocessor that
calculates current heart rate value based on the time
interval between the pulses sent by the Polar RMCM-01
receiver to the microprocessor. This calculation contains
certain amount of averaging, and other techniques, known
as an algorithm, to ensure a reliable and stable heart rate
reading.
The microprocessor of the end user equipment thus has the
following functions:
1.
Receiving of the electric heart beat pulse from
the Polar Receiver
2.
Calculating the times between the pulses
3.
Performing the error checks
4.
Calculating the heart rate
5.
Sending the heart rate to the display
