ES-U-2016-RM EasySync, ES-U-2016-RM Datasheet - Page 33

• Manufacturer Part Number: ES-U-2016-RM
• Description: USB Interface IC USB to 16 Ports RS422/RS485, Metal
• Manufacturer: EasySync

7
This section provides some advice to help if you encounter problems during installation or use of your
converter. Please check these items before contacting EasySYNC technical support. If you still have
problems, you can contact technical support using the contact details in section 8 on page 39.
7.1
Cables are the most common source of problems with external devices. Please check the following:
USB Connections:
USB Hubs:
Power Connections:
RS-232 connections:
RS-485/RS-422 connections:
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Troubleshooting
Hardware
USB cable is properly connected at both the Computer and the Converter ends
Computer power is ON
Computer is not in Sleep or Standby
If a USB Hub is used, be sure all cables are securely connected
Try connecting the USB cable from the converter directly to a port on the PC to see if this works
If the hub requires a power supply to operate, ensure that this is connected and that the hub is
powered up correctly.
Hubs certified by the USB-IF are recommended.
Check that the power LED on the converter is on.
If your converter requires an external power supply, ensure that the power supply is securely
connected to both the power input socket on the converter and the AC power outlet.
If your converter has an internal power supply, ensure that the power cable is securely connected
to both the power inlet socket on the rear panel of the converter and the AC power outlet.
On converters supporting multiple protocols, check that the DIP switches are set for RS-232
mode.
Output signals (TXD, RTS, DTR) are connected to the respective inputs (RXD, CTS, DSR) in each
direction.
Check for specific handshake requirements of your RS232 peripheral. If handshake signals are
not used, ensure the application is set to “No Hardware Handshake”, or equivalent.
Ensure that the converter‟s baud rate and parity settings match the equipment on the other end
of the cable.
Test the port with a loop-back connector. Connect TXD to RXD, RTS to CTS and DTR to DSR.
Use a simple terminal program to check that data is transmitted and received.
Check that the DIP switches or jumpers are set for the serial correct mode (see section 5 starting
on page 14). The DIP switch and jumper settings are slightly different for some models of
converter, please ensure that you use the instructions in section 5 which correspond to your
model of converter.
Ensure that you have connected the correct pins/terminals according to the wiring diagrams in
section 6 (starting on page 23).
Confirm if the jumper settings, such as termination and biasing, are correct for your particular
application. This will depend on the other devices on your RS-422/RS-485 network and how they
are connected.
©2010 - 2011 EasySYNC Ltd.
Document Reference No.: ES_000061
USB to Serial Converters Manual
Clearance No.: ES
Version 1.2
# 35
33