Danntech PI-USB/RS485 User manual

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Filename: USB to RS485 Converter User Manual.docx
Date: 14 February 2014
Version: 1.0
USB to RS485 Converter User Manual
Description
Our range of USB to RS485 Converters comprises of three types – one where the two wire RS485 connections are
electrically connected to the USB interface (non-isolated) and two others which have galvanic isolation (5kV)
between the USB interface and the RS485 interface (isolated). The isolated types come in two models which can
operate at maximum speeds of 500Kbps and 3Mbps.
The non-isolated USB to RS485 converter is
ideal for most applications and environments
such as office, laboratory, server rooms and
non-commercial environments. We
recommend the isolated versions for industrial
and factory environments where one cannot
take the chance of either damaging the PC or
damaging the equipment which you are
connecting to.
Drivers for our USB to RS485 converters are
available for most versions of Windows
including Windows 8 and the latest Windows
Server version. Linux and Android drivers are also available. Once the drivers have been installed and the
converter is connected to your computer's USB port, a virtual COM port will be created.
Specifications
•Drivers for Windows 8 32/64, Windows 7 32/64, Vista 32/64, XP 32/64, Server 2003/8R2 32/64, 2000, ME,
98Se, Mac, 8/9/X, Linux.
•WHQL compliant COM drivers included.
•USB port-powered, no external power needed.
•FTDI232 USB chip and Analogue Devices RS485 Drivers
and Isolator.
•UART I/F Supports 7 / 8 Bit Data, 1 / 2 Stop Bits and
Odd/Even/Mark/Space/No Parity.
•USB Plug and Play with Windows 7 and 8.
•Indication LED for TX and RX activity.
•Auto detection of data speed.
•USB 1.1 and USB 2.0 compatible.
•Screw terminal connections for wire 1.5mm2maximum.
•Automatic data direction control.
•Typical communications speed: maximum 115.2Kbps at 1,000m.
•Up to 32 nodes in network configuration.
•Operating temperature -10°C to 60°C.
•Internal link for 220Ω termination resistor if required.
•Dimensions 70 x 19 x 17 mm (L x W x H).
•Packaged dimensions 110 x 100 x 45 mm (W x D x H), weight 60g.
•Latest drivers and software are included on the CD or the very
latest are available at:
http://www.ftdichip.com/Drivers/VCP.htm
http://www.ftdichip.com/Support/Documents/InstallGuides.htm
http://www.ftdichip.com/Support/FTDocuments.htm

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Installing the Termination Resistor Link
It is only quite rarely that you will need to install a termination resistor in the USB to RS485
adapter. More commonly the termination resistance is installed at the end of your
communications line. If you are experiencing data loss (and know that your slave devices are
working and addressed correctly) rather:
1. reduce the communications speed,
2. then add a termination resistance at the end of your line and
3. then try installing the termination resistor in the adapter.
The adaptors are delivered with the links open – no termination.
Prise open the unit carefully just a little using a small screwdriver at the corners of the unit. Use
a larger screwdriver to avoid bruising the plastic housing:
Part Numbering
PI-USB/RS485 USB to RS485 Converter
PI-USB/RS485-I USB to RS485 Converter – Isolated
PI-USB/RS485-IX USB to RS485 Converter High Speed – Isolated

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The link for the non-isolated versions is located inside the unit and the isolated versions have
the link in a small plastic packet inside the product packaging.
To get the latest user manual please download from:
http://danntech.com/usermanuals/USB to RS485 Converter User Manual.pdf
Non-Isolated Type
Isolated Type
Link open – no termination
Link open – no termination
Link installed – 220Ω termination
Link installed – 220Ω termination
danntech cc
Reg. No. CK1986/15338/23
Tel: + 27 (0)11 792-1239
Fax: + 27 (0)11 792-4687
P O Box 1023, Fontainebleau, 2032
Republic of South Africa
www.danntech.com
www.danntech.co.za
danntech ltd
Co. No. 6510211
Tel: [phone]
15 College Close, Hamble-le-Rice
Southampton, Hampshire,
SO31 4QU, United Kingdom
www.uk.danntech.com