USB to Serial Converters Manual
Version 2.1
Document Reference No.: CP_000032 Clearance No.: CP#022
Copyright © Connective Peripherals Pte Ltd
9
3.3
Power Supply
Depending on the model, power will either be supplied from the USB port, from an external power
adapter or from an internal switching supply. The different types are described below. Table 1 on page 6
shows which type of power supply is required for each converter model.
USB powered
These devices are powered directly from the USB port. No power supply is required for these converters.
It is recommended to connect them direct
to a PC’s USB port. If necessary to use a US
B hub, it is
strongly recommended to use a self-powered hub (which has its own PSU) as bus-powered hubs may not
be able to provide sufficient power.
Power Adapter
These devices are provided with an external power adapter in the package. The adapter supplied has a
UK, EU or USA plug depending on the country of sale and so may vary from the one shown below. The
low voltage connector is either a 3-pin terminal block connector or a barrel-type jack as shown below,
depending on the model. For more details, see Table 1 on page 6.
The low voltage cable should be connected to the power (or DC in) socket on the converter, and the AC
input plug should be connected to a power source before using the converter.
Always use the supplied adapter to power your ES-U-xxxx-x converter; damage will occur if an
adapter providing the wrong voltage is used and is not covered by the warranty.
Figure 5 - Some models use a power adapter with barrel or terminal connector
The revision B of the rack-mountable units now also have external power supplies and use the connector
shown in Figure 6.
Figure 6
–
ES-U-3008-RMB power connector
Internal Switching Power Supply
The rack mountable (ES-U-xxxx-RM) devices require an AC input (100V ~ 240V, 47
–
63 Hz) for the
internal switching power supply. A power cable is supplied with the converter and connects to the power
inlet socket on the rear panel. The cable has a UK, EU or USA plug depending on the country of sale and
so may vary from the one shown below.
Barrel Plug
connector
Terminal
Block
connector
ES-U-2108-M
ES-U-2008-M
