RA0002 - Technical Information Manual
9
General Description
The RA0002 module is an I/O interface between the CAEN RFID readers and any external devices controllable by the
readers.
The supply voltage of the interface is in the range 9Vdc ÷ 36Vdc (24Vdc nominal).
The device is equipped with 4 lines of INPUT, 4 lines of OUTPUT and 1 line connected to a SPDT relay.
The lines of INPUT/OUPUT are opto-isolated, so the reader is electrically separated from the digital interface.
In INPUT, valid signals are considered from 5 to 36 V, while the OUPUT can deliver a maximum current of 500mA in
push-pull configuration.
The INPUT/OUTPUT lines are accessible via PUSH IN spring connection that facilitates the connections with the user's
devices and the I/O selected by the reader are visible through the LEDs on the front of the box.
The following table shows the correspondence between the DB15 female connector GPI/O and the RA0002 GPI/O:
DB15 GPI/O
RA0002 GPI/O
IN / OUT
GPIO0
GPI0
IN
GPIO1
GPI1
IN
GPIO2
GPI2
IN
GPIO3
GPI3
IN
GPIO4
GPO0
OUT
GPIO5
GPO1
OUT
GPIO6
GPO2
OUT
GPIO7
GPO3
OUT
GPIO8
RELAY OUT
OUT
Tab. 2.1: Correspondence between the DB15 GPI/O and RA0002 GPI/O
In CAEN RFID readers each GPI/O channel can work both as an input and as an output, while in the RA0002 there are 4
input dedicated channels, 4 output dedicated channels and an output channel that drives a SPDT relay.
By default the inputs and the outputs of CAEN RFID readers are HIGH and for this reason the RA0002 module is
designed to work according a negative logic.
The DB15 female connector is dedicated for
, while for the others CAEN RFID readers it is necessary
to wire the connector (for more info see §
pag. 29).
