Camden Door Controls CV-940-USB Installation Instructions

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 conguration of a multi
serial system without any IRQ or DMA conguration.

Specifications

The CV-940-USB converter can be congured 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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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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