USB to Serial Converters Manual
Version 2.1
Document Reference No.: CP_000032 Clearance No.: CP#022
Copyright © Connective Peripherals Pte Ltd
10
Note that the revision B rack-mountable units (such as ES-U-3008-RMB) now have an external power
supply instead of the internal power supply, and uses the connector shown in the Power Adapter section
above in Figure 6.
Figure 7 - Rack-mount model with an internal supply with AC input connector
3.4
Optical Isolation & Surge Protection
Optical isolation and surge protection are available in the ES-U-11xx and ES-U-21xx converters.
Each serial port is individually optically isolated with 2000-volt DC optical isolation. The optical isolation
protects your PC or notebook from spikes and surges on the RS-232 or RS-422/RS-485 network, by
converting the electrical data into an optical signal and then changing it back into electrical data. Your
computer is well protected since the surges and spikes cannot cross the optical link.
Each serial port is individually protected by surge protector to withstand electrostatic discharge and
power surges up to 25KV ESD.
3.5
Configuring for RS-232, RS-422 and RS-485 Modes
The ES-U-2xxx-x and ES-U-3xxx-x converters can be configured for different interface types. These
converters have DIP switches or internal jumpers to select the required interface. They also feature
internal jumpers to select options such as termination and biasing of the RS-422 and RS-485 lines.
Please refer to section 4 for more information on the DIP switch and jumper settings available on each
model of converter.
Figure 8 - ES-U-2xxx and ES-U-3xxx have DIP switches to select the serial mode
ES-U-2016-RM
ES-U-3008-RM
