USB
-
RS-485 Interface Converter
User’s Manual
Introduction
The ATC-820 module is a cost-effective way to convert
RS485 industrial buses to a USB interface. When connected
to a PC USB port the ATC-820 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 configuration of a multi serial system
without any IRQ or DMA configuration. They have 600W
protect between the USB port and RS485 protects the PC
from spykes or possible misconnections in the communication
bus.
Features
The ATC-820 converter can be configured for RS485 two-
wire (Half Duplex) networks. When operating in two-wire
RS485 the data transfer control is automatically done by the
converter. Two independent and RS485 networks can be
supported by one ATC-820 module thus duplicating the
possible number of remote devices.
Computer interface: USB V1.1 2.0 Plug and Play.
Operational system virtual serial port driver.
Supports Windows 98/ME/XP/2000/CE, MAC & Linux
2.4.20 or superior.
Field Interfaces: RS-485 Half Duplex (dual buses).
Automatic flow control for RS485 Half Duplex.
Transmission rate: from 300 bps to 1Mbps.
Maximum RS-485 cable length : 1200 m
Maximum number of devices in the RS485 network: Half
Duplex to 32 devices.
Power: from the USB port.
Consumption: <100 mA.
RS-485 bus protection: 600W.
USB connection: Mini-B connector. 100cm cable with the
module.
RS-485 connector: DB9M or RJ-45 type accepting
ABS enclosure: 67 x 30 x 24 mm (not include cable).
Operating environment: 0 to 70°C, 10 to 90% relative
humidity, non-condensing.
Wiring configuration
The RS-485 termination of the Interface is implemented as a
DB9 plug. The pin assignments for the connector can be
found in the following table as well as on a sticker applied to
the unit.
RS-485 Pinout at DB9 Male
PIN# RS-485
1 485
-
2 485
+
LED indication
Red LED - Data Sending From USB port to RS-485
Serial Port side Green LED - Data Receiving from RS-485
Serial port side to USB port.
Wiring examples
RS-485 2- Wire application
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. For
Windows 98, click
Search for the best driver for your
device
and click to search driver from the floppy drive
D:\DRIVER\Win98&Win2000.
4.
Windows will detect the driver (
FTDIBUS.INF
) and shows
the
USB HS SERIAL CONVERTER
. Click Next to
continue installation.
5.
Click Next to continue and let Windows copy the needed
files to your hard disk.
6.
When Windows finished installing the software required
for the new
USB to Serial Cable
, click Finish.
Setting Up the RS232 Serial Device
Follow the steps below to connect your RS232 Serial Device
(ie: Modem) to the USB port of your PC:
1. Turn off your Modem. Plug the DB 9 (or DB 25) connector
of the USB-HS Serial Converter into your Modem. Connect
the other end of the USB-HS Serial Converter to an USB type
A to type B cable. Turn on the Modem afterwards.
