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USB ↔ RS485/RS422 Converter
INSTRUCTION MANUAL
INTRODUCTION
The USB-i485 module is a cost-effective way to convert RS485 or RS422 industrial buses to a USB interface. When
connected to a PC USB port the USB-i485 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. 1500 Vdc isolation between the USB port and RS485 / RS422 protects the PC
from spikes or possible misconnections in the communication bus.
SPECIFICATIONS
The USB-i485 converter can be configured for four-wire (Full Duplex) RS422 and RS485 or two-wire (Half Duplex)
networks. When operating in two-wire RS485 the data transfer control is automatically done by the converter. Two
independent and isolated RS485 networks can be supported by one USB-i485 module thus duplicating the possible
number of remote devices.
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Computer interface: USB V1.1 Plug and Play.
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Operational system virtual serial port driver. Supports Windows 7/Vista/XP/2008Server/2003Server/98/ME/2000/CE,
MAC & Linux 2.4.20 or above.
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Field Interfaces: RS485 Half Duplex (dual buses), RS485 Full Duplex or RS422.
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Jumper selected RS485 / RS422.
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Automatic flow control for RS485 Half Duplex.
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120 Ohms internal resistors termination enabled by jumpers.
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Data rate: from 300 bps to 250 kbps.
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Maximum RS485 / RS422 cable length : 1200 m
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Maximum number of devices in the RS485 network (unit load devices – 12 kΩ):
Half Duplex: 2 x 32 devices
Full Duplex: 32 devices
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Data transmission and reception LED indicators
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Power: from the USB port. Consumption: <100 mA.
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Isolation: 1500 Vdc (1 minute) from USB interface and the RS485 / RS422 interface.
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RS485 / 422 bus protection: ± 60 Vdc, 15 kV ESD.
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USB connection: Mini-B connector. A 1.5 m cable with plugs mini-B and A is provided with the module.
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RS485/422 connector: screw terminal type accepting 1.5 mm² (16 AWG) wires.
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Operating environment: 0 to 50 °C, 10 to 90 % relative humidity, non-condensing.
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ABS enclosure: 70 x 60 x 18 mm
USB-i485
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Table of Contents
Summary of Contents for scigiene USB-i485
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Page 1: Specifications
The USB-i485 module is a cost-effective way to convert RS485 or RS422 industrial buses to a USB interface. When connected to a PC USB port the USB-i485 module is automatically detected and is installed as a native COM port, which is compatible with any existing serial communication application. -
Page 2: Usb Driver Installation
5. Select “Next” when Windows® is ready to install the driver. 6. The USB-i485 driver files will be copied to your computer and, when concluded, a window will show up informing that the wizard has finished installing the software. Select “Finish”. - Page 3 6. If a warning message regarding Windows® XP compatibility appears, select “Continue Anyway”. 7. The USB-i485 driver files will be copied to your computer and, when concluded, a window will show up informing that the wizard has finished installing the software. Select “Finish”.
- Page 4 The following figures illustrate the most important steps for this procedure. CONNECTIONS The appropriate connection to the USB-i485 depends on the type of serial network: RS422, 2-wire RS485 or 4-wire RS485. The following figure shows a description of all USB-i485 connection terminals.
- Page 5 To set this mode of operation, the MOD terminal (pin 4) must be connected to terminal GND (pin 5). In this mode two pairs of wires are used. Data from the USB-i485 to the networked devices are transmitted through one pair, and the other pair carries data from the devices to the USB-i485.
- Page 6 The need to install termination resistors depends on the total length of the communication bus and the communication speed (baud rate). The USB-i485 has a built-in termination resistor, which can be installed by wiring terminal RT2 (3) as shown in dashed lines in the last figure.
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