User manual

REI2
User manual
Doc: R2U_2_1079_002_E
Version: 1.07.9
Page
28 of 64
13. Connection schemes
Below, several of the most frequently used connection modes are shown as examples. Although all
the connections are fitted with safety circuits to protect against short-circuits, you should be careful
to avoid any short-circuits.
With the exception of the power socket, which should however only be used within the
defined ranges, no source of power should be applied to any contact if you wish to
avoid possible damage to the stopwatch and the peripherals connected to it.
REI2 AND ANY PERIPHERALS AND ACCESSORIES SHOULD BE
CONNECTED TO THE MAINS SUPPLY (220V) ONLY WITH THE
DEDICATED ADAPTORS. CONNECTION CABLES FOUND
CONNECTED UP SHOULD BE CONSIDERED ‘LIVE’ UNTIL YOU HAVE PROOF TO
THE CONTRARY.
13.1. Banana jack lines
REI2 accepts command devices with contact either normally open or normally closed. To connect
devices which do not require power or have their own power supply, 4 input lines are available:
Start, Lap (intermediate), Stop and Aux (auxiliary), all configurable in accordance with the program
used. Each line has its own ground contact. All the grounds are connected to each other and
therefore equivalent and invertible.
Fig. 7 shows an example of connection using banana jacks.
13.2. DIN lines
On the DIN connector the same 4 lines and the relative ground are available together with stabilised
power supply for powering external devices such as cells. It is therefore possible to power the
external device without ‘consuming’ the charge of the batteries in it, in the case of devices which
have them (for example, the Polifemo cell), or to power devices which do not have them (e.g.
LBM1 cells).
The contacts are connected in parallel to those on the banana jacks.
Fig. 8 shows an example of a connection using the lines on the DIN connector. This connection,
with the Polifemo cell configured in Stop, is similar to the one in section 13.1, Banana jack lines.
For N/O contacts, the contact is considered closed when a voltage signal of at least 2,8 volts for the
duration of 1/10,000s is detected and reopened with a fall of 2,2v for 1/1,000s, while for N/C the
contact is considered open when a current signal of 2,8 v for the duration of 1/10,000s is detected
and reclosed at 2,2v per 1/1,000s (difference of potential between line and ground).
Both for the N/O lines and the N/C lines all events inside 1/1000s (antibounce circuit) from the
event detected are ignored. The maximum recommended load on the lines is 2 KΩ.
See Fig. 9 and Fig. 10 for the relative schemes and Fig. 11 for an example of impulses ‘discarded’
after the first one. The schemes are NOT to scale.
13.3. LinkGate system
For details of the connection modes of the LinkGate system, see appendix ‘B’.
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