USB to Serial Converters Manual
Version 2.0
Document Reference No.: CP_000032 Clearance No.: CP#022
Copyright © Connective Peripherals Pte Ltd
44
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Check that the DIP switches or jumpers are set for the serial correct mode (see section 5 starting
on page 23). 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 32).
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Singnal naming conventions vary between manufacturers. This includes notations A and B for
RS485. Connective peripherals therefore indicate Data + and Data
–
instead. Check the manual for
your serial device to determine which terminal is Data + and which is Data -.
-
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.
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If your application is receiving additional unexpected zero bytes, the biasing resistors can be
enabled to resolve this. Section 5 gives details of how to enable the biasing resistors for each model
of converter. Note that some ES-U-xxxx do not have internal biasing resistors and so these would
need to be fitted externally.
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Some application programs cannot work with the Echo enabled. This can be resolved by disabling
the Echo option using the DIP switches or jumpers (depending on model of converter). Section 5
gives details of how to select RS-485 mode without Echo.
7.2
Removing
existing FTDI
drivers
This procedure for Windows shows how to remove the currently-installed FTDI drivers thereby helping to
ensure a clean install.
If the computer has had any earlier verisons of the FTDI driver installed, it is recommended to remove the
old one first. Also, in the event of issues installing the driver or issues in opening and using the COM port
provided by the unit, it is recommended to remove and re-install the drivers.
This procedure is provided for information only. FTDI / Connective Peripherals accept no
responsibility whatsoever for any problems or consequences resulting from its use. Users requiring
further information should consult the CDM Uninstaller user guide and the installation guides
provided for each OS on the FTDI website.
1.
Disconnect the USB cable of your FTDI converter(s) from the PC before running the uninstaller.
2.
Create a folder on your desktop called CDMuninstaller. Then download the driver uninstaller from
the link below and save it into the folder you created.
http://www.ftdichip.com/Support/Utilities/CDMUninstaller_v1.4.zip
Note: If you wish to run this uninstaller tool on a computer which is never connected to the
internet, you can download the file using another computer and use a USB flash drive or similar
to copy the file over to the computer which will be used with the converter.
3.
Unzip the CDMUninstaller program.
