GC-ATC-840
USB to RS-422 Interface Converter
User’s Manual
Introduction
The GC-ATC-840 module is a cost-effective way to convert
RS422 industrial buses to a USB interface. When
connected to a PC USB port the GC-ATC-840 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 RS422
protects the PC from spikes or possible misconnections in
the communication bus.
Features
The GC-ATC-840 converter can be configured for RS422
four-wire (Full Duplex) networks. When operating in
four-wire RS422 the data transfer control is automatically
done by the converter.
The GC-ATC-840 has a 384 byte receive buffer with an
adjustable timeout and a 128 byte transmit buffer with
auto-transmit control. The GC-ATC-840 makes it easier to
add RS422 devices to your system with easy plug-and-play.
•
Computer interface: USB 1.1 & 2.0 Plug and Play
•
Virtual serial port driver.
•
Supports Windows 98/ME/XP/2000/CE/Vista, MAC
& Linux 2.4.20 or greater
•
Field Interfaces: RS-422 Full Duplex
•
Automatic flow control for RS422 Full Duplex.
•
Transmission rate: from 300 bps to 921Mbps.
•
Maximum RS-422 cable length : 1200 m
•
Maximum number of devices in the RS422
network: Full Duplex to 32 devices
•
Power: from the USB port.
•
Consumption: <100 mA
•
RS-422 bus protection: 600W.
•
USB connection: Mini-B connector. 1000mm cable
with the module.
•
RS-422 connector: DB 9Male
•
ABS enclosure: 60 x 57 x 24 mm(not include
cable)
•
Operating environment: 0 to 70°C, 10 to 90%
relative humidity, non-condensing.
Wiring configuration
The RS-422 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-422 Pinout at DB9 Male
PIN#
RS-422
1
T-
2
T+
3
R+
4
R-
5
GND
LED indication
Red LED
Data Sending from USB port to
RS-422 Serial Port side
Green LED
Data Receiving from RS-422 Serial
port side to USB port
Wiring examples
