Controlled Electronic Management Systems Ltd INFOPROX Manual Do Utilizador

InfoProx Entry   

InfoProx Hardware Installation 

Power is supplied to the board by a J3 connector. In Figure 2, the diagram 
identifies the location of the terminal and power connections: 

 

The total cable length between the power supply and the reader depends upon the 
cable used and whether or not an exit reader is connected. See the following 
instructions regarding voltage:  

1. 

For long cable runs, use Table 1, Voltage Table, to figure the voltage drop of 
the cable between the power supply and the reader.  

2. 

Subtract the result from the power supply’s output voltage.  

3. 

If the result is greater than 7.0 volts, the wiring is adequate. If not, use heavier 
(lower gauge) wire or a power supply with a higher voltage output. 

If you use a 22AWG wire with a 12-volt power supply 300 feet 

away from the readers, the voltage drops to 7.2 volts at the 

reader.  Using Table 1, Voltage Table to calculate the voltage, 

multiply 3 (300 ft) times the 1.6V drop = -4.8 drop for the 300 

ft. span.  Subtracting 4.8 from the 12V supply = 7.2. A voltage 

of 7.2 at the readers is sufficient power to operate the readers 

above the 7V minimum required. In this example, the total 

distance from the power source and the exit cannot be more 

than 300 ft.