Specifications

Section 2: System Description
2-27
2.8 DIGIREADER DIGITAL COMMAND
KEY READERS*
DigiReaders emit a low-level 140-KHz field. When a digital command key is placed in this field,
the key uses the field's energy to become activated. Once activated, the key responds by
broadcasting a 70-KHz signal, modulated with a key-specific code sequence, back to the reader.
The reader receives this signal and converts it to a digital code which is then sent to the ACU.
The ACU identifies the digital command key according to its code and makes an access decision.
The digital reader series features bidirectional reading capability; digital command key cards can
be read when presented to the front or back of the reader. Specifications for the DigiReaders
are listed in Table 2-8 below.
Table 2-8: DigiReader Digital Command Key Readers
Model Dimensions Read Range** Input Current
DR 4204
Hei
g
ht
Width
De
p
th
7.5 in
(
19.4 cm
)
1.86 in
(
4.72 cm
)
1.22 in
(
3.10 cm
)
4 in
(
10.16 cm
)
80 to 100 mA
DR 4205
Hei
g
ht
Width
De
p
th
5.3 in
(
14.46 cm
)
5.74 in
(
14.58 cm
)
1.27 in
(
3.23 cm
)
6 in
(
15.24 cm
)
50 - 80 mA
DR 4205E
and
DR 4205K
Hei
g
ht
Width
De
p
th
5.3 in
(
14.46 cm
)
5.74 in
(
14.58 cm
)
1.27 in
(
3.23 cm
)
6 in
(
15.24 cm
)
50 - 80 mA
DR 4208
Hei
g
ht
Width
De
p
th
5.3 in
(
14.46 cm
)
5.74 in
(
14.58 cm
)
1.27 in
(
3.23 cm
)
10 in
(
25.40 cm
)
110 to 220 mA
DR 4226
Hei
g
ht
Width
De
p
th
17.88 in
(
45.42 cm
)
9.0 in
(
22.86 cm
)
1.28
(
3.25 cm
)
24 in
(
60.96 cm
)
500 mA
DR 4238
Hei
g
ht
Width
De
p
th
26.13 in
(
66.37 cm
)
13.78 in
(
35.0 cm
)
1.87 in
(
4.75 cm
)
36 in
(
91.44 cm
)
700 mA
DigiReader digital command key readers require a primary power source of +16 VDC to +28
VDC. A nominal 24-volt supply is recommended. For technical details on specific DigiReader
models, see the appropriate WSE manual.
*
The DigiReaders may be used with the SE 818SC only. They are not supported by the SE 818SX.
Maximum range given. Actual range varies with key type and installation conditions.