Power Supply - Symbol LL 500 Guía Rápida

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A look at the individual components.
LL 500
This is the interface controller that lets you take bar code,
magstripe and/or serial data and send it to your host system.
You'll notice the various ports and connectors and LEDs. There's
a description of each of them in the LL 500 Product Reference
Guide. Pay special attention to the Power Selection Plug. If this
plug is removed, and an external power supply is not
connected, the unit will not operate.
Depending on the model of LL 500, the Primary and Secondary
scanner ports have been pre-set for 5V or 12V scanners.
LL 500-I200 models have the primary port configured for 12V,
and the secondary port for 5V.
LL 500-I201 models have the primary port configured for 5V,
and the secondary port for 12V.
Cable
Every unit needs one (or more). This is the physical connection
between the LL 500 and your host device. You may have two
cables because some interfaces (like dual port RS-232-C) require
two.

Power Supply

Some host devices supply enough power to run the
LL 500 and its attached scanner. When that's not the case, you'll
need an external power supply. If you're not sure if your host
supplies sufficient power, ask your Symbol representative.