Page 1
Introduction
RS485-2 Wire Application
The CV-940-USB module is a cost-effective way to convert an
RS485 industrial bus to a USB Interface. When connected
to a PC USB port, the CV-940-USB module is automatically
detected and is installed as a native COM port, which
is compatible with any existing serial communication
application. Multiple modules can be installed when using
USB hubs thus allowing a hassle-free conguration of a multi
serial system without any IRQ or DMA conguration.
Specifications
The CV-940-USB converter can be congured for RS485
two-wire (Half Duplex) networks. When operating in two-wire
RS485, the data transfer control is automatically done by the
converter.
• Computer interface: USB V1.1 2.0 Plug and Play
• Operational system virtual serial port driver
• Supports Windows Vista/7/8/8.1, MAC&Linux 2.4.20
or superior
• Field Interfaces: RS485 Half Duplex
• Automatic ow control for RS485 Half Duplex
• Transmission rate: from 300 bps to 1Mbps
• Maximum RS485 cable length: 3,937Ft. (1,200 m)
• Maximum number of devices in RS485 network:
Half duplex to 32 devices
• Power: from the USB port
• Consumption: <100 mA
• RS485 bus protection: 600 W
• USB connection: Mini-B connector. 3,280Ft. (1 m)
cable with the module
• RS485 connector: DB9M or RJ-45 type accepting
• ABS enclosure: 2.6” x 1.2” x 0.94”
(67mm x 30mm x 24 mm)
(not include cable)
• Operating environment: 32°F to 158°F (0°C to 70°C),
10 to 90% relative humidity,
non-condensing
CV-940-USB
Installation Instructions
Wiring Configuration
The RS485 termination of the interface is implemented as a
DB9 plug. The pin assignment for the connector can be found in
the following table as well as on the sticker applied to the unit.
PIN#
1
2
LED Indication
Red LED: Data Sending from USB port to RS485 Serial
port side
Green LED: Data Receiving from RS485 Serial port side
to USB port
PC CV-940-USB
RS485
485+
485-
1
USBUSB
485+
485-
2
485+
485-
485+
485-
RS485
Device
RS485
Device
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Page 2
Driver Installation
Follow the steps below to install driver of USB-High speed
Serial Converter:
1. Power on your computer and make sure that the USB port is
enabled and working properly.
2. Plug in the USB-High Speed Serial Converter into the USB
port and run the Add New Hardware wizard to assist you in
setting up the new device. Click Next to continue.
3. Insert the USB-HS Serial Converter software driver into the
CD-ROM drive and click Next to continue. Search for the
best driver for your device and click to search driver from
the oppy drive D;/DRIVER/For Windows XP
4. Windows will detect the driver (FTDIBUS.INF) and shows
the USB-HS SERIAL CONVERTER. Click Next to continue
installation.
5. Click Next continue and let Windows copy the needed les
to your hard disk.
6. When Windows has nished installing the software required
for the new USB to Serial Cable, click Finish.
CV-940-USB
With this, the USB Converter is installed and the installation
will continue with installing USB serial Port.
Note: In Windows Vista 7, 8 & 8.1 the drivers should
be found automatically.
Setting up the USB Serial Port
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Page 3
CV-940-USB
The newly installed Com port can be seen in: Start/Settings/
Control Panel/System/Hardware/device manager
Disclaimer
Information in this document is subject to change without
notice. Camden Door Controls does not make any
representations or warranties (implied or otherwise) regarding
the accuracy and completeness of this document and shall in
no event be liable for any loss of prot or any other commercial
damage, including but not limited to special, consequential, or
other damages. No part of this document may be reproduced
or transmitted in any form by any means, electronic or
mechanical, including photocopying, recording and retrieval
systems without the express written permission of Camden
Door Controls.
All brand names and product names used in this document
are trademarks of their respective holders.
Push Buttons Keypads Strikes Magnetic Locks Key Switches Relays & Timers Access Control
5502 Timberlea Blvd.,
Mississauga, ON Canada
L4W 2T7
www.camdencontrols.com
Toll Free: 1.877.226.3369
Page 3 of 3
File: CV-940-USB
Installation Instructions.indd R1
Revision: 26/08/2015
Part No.: 40-82B182
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