2.5 POWER CONNECTIONS
On the Model 2022E, power wiring is already threaded through the cable gland and connected to the
solder tail DIN connector (P1) on the circuit card. There should be a knot in the wire to provide strain
relief. Wires should be connected in accordance with the following:
TABLE 2-1 POWER CONNECTIONS
DIN Connector (P1) CONNECTION
PIN NUMBER FROM DC SOURCE
a1,c1 +5v
a32,c32 DC Return (GND)
WARNING
The power source should be turned off while making connections to the reader. It is
recommended that the power source remain off anytime the circuit board is removed from its
enclosure assembly.
Power connection to the Interface should be made with the power source turned off. There is no
onboard over current protection so an external fuse is recommended to protect the power supply if it
has no over current protection of its own.
If the Interface is to be used without an enclosure, these mating DIN connectors are recommended for
connection of the power wires:
Panduit 100-964-454
Elco 208457096008026
Weidmuller 914605
If the Interface is to be housed in a backplane, make sure that pins a,c2 - a,c31 are left unconnected.
These pins are connections to the processor's data bus and can affect the Interface's operation if
improperly connected.
A note about power cable length: Long power cables will produce voltage drops resulting in a lower
voltage at the Interface end than at the power supply end. There is no inherent limit to the length of wire
from the supply to the Interface as long as the high and low voltage specifications are maintained at the
Interface.
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