User's Manual

SEL-3021 Transceiver Instruction Manual Date Code 20041005
Introduction & Specifications
Connections, Reset Button, and LED Indications
1.4
Connections, Reset Button,
and LED Indications
The figure below shows typical connections for the SEL-3021.
Figure 1.3 Typical Connections for the SEL-3021
Power Supply Connections
You can apply 5 to 24 Vdc directly to the SEL-3021 power terminals, which are
available either as compression terminals or a 2.5 mm jack. You must use an auxiliary
power supply to supply a voltage source other than 5 to 24 Vdc. See Specifications on
page 1.10 for power requirements.
IMPORTANT: Use only one power connection at a time.
Untrusted
Interface
Insecure
Network
Modem
+
SEL-2030
SEL-2506
SEL-421 SEL-311L
PC
Computer
or PDA with
802.11b
Trusted
Interface
5–24
Vdc
125
Vdc
Fuse
AES Encrypted
Wireless 802.11b link from
computer to SEL-3021
EIA-232EIA-232
Contact
Input
Preliminary Copy