STEPRACE: Service & Maintenance Manual - rev. 1.2
Page 3.2
• Coded: this is the product which, utilizing Personal Coded Device technology, transmits
the heart rate together with a code that identifies the transmitter in question. In this way,
the coded receiver on the machine can identify the source of the heart rate signal, thereby
avoiding interference problems.
(2) CARDIO RECEIVER
It is connected to the machine’s CPU board and receives the pulses sent by the transmitter.
There are 2 types of receiver:
• Non-coded: this is the standard product. If used in conjunction with a coded transmitter, it
may provide an incorrect heart rate reading;
• Coded: this is the product which, utilizing Personal Coded Device technology, receives
the heart rate together with a code that identifies the transmitter in question. In this way
the machine can identify the source of the heart rate signal, thereby avoiding interference
problems.
Its reception area is approximately a circle of 1 meter of radius. If there is electromagnetic
noise (produced by high voltage lines, radio transmitters, monitors, motors, etc.) within its
reception area, the receiver becomes saturated and stops receiving any signal. If it is non-
coded and there are 2 transmitters within its area of reception, it will receive signals from
both, and may produce an error or irregular reading.
(3) DISPLAY
This is the heart of the machine, which controls all the machine functions by executing the
program stored in EPROM. It receives information from the user (age, weight, etc.) during
set-up of the training session, from the cardio receiver (user’s heart rate) and from the
alternator interface board for displaying workload data (Watt and SPM). It controls the
difficulty level selected with the “+” “−” keys or according to the chosen training program.
It consists of 2 circuit boards:
• CPU board: contains the microprocessor, and all the logic circuits for controlling the
machine and the LCD;
• LED board: contains the circuits pertaining to the display and indicators: LEDs and 7-
segment display.
The CPU board contains 2 banks of 4 dip-switches one and 2 dip-switches the other, which
are used for configuring the machine.
On the CPU boards of TGS adapted machines there is a jumper J2 which sets the transmission
mode of the serial port.
• J2 in position 1-2: sets the RS 485 serial port in full duplex mode;
• J2 in position 2-3: sets the RS 485 serial port in half duplex mode.
(4) POWER SUPPLY
Receives the mains voltage at its input and outputs the DC voltages (+5 Vdc, +12 Vdc and
−12 Vdc) which supply the display and the alternator interface board.
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