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Installation Guide of Hi-Speed VScom USB Industrial I/O Adapter
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Installation Guide of Hi-Speed
VScom USB Industrial I/O Adapter


The VScom USB Industrial I/O Adapters consist of the following models:

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USB to Single RS-422/485 Adapter (USB-COMi)

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USB to Single RS-422/485 Adapter
- with optical isolation and surge protection (USB-COMi-SI)

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USB to Dual RS-422/485 Adapter (USB-2COMi)

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USB to Dual RS-422/485 Adapter
- with optical isolation and surge protection (USB-2COMi-SI)

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USB to Quad RS-422/485 Adapter (USB-4COMi)

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USB to Quad RS-422/485 Adapter
- with optical isolation and surge protection (USB-4COMi-SI)


Introduction
Introduction



The USB Industrial I/O Adapter is designed to make industrial communication port
expansion quick and simple. Connecting to a USB port on your computer or USB hub,
the USB Industrial I/O Adapter instantly adds industrial communication port to your
system. By taking advantage of the USB bus, the USB Industrial I/O Adapter makes it
easier than ever to add RS-422 or RS-485 device to your system with easy
plug-and-play and hot plug features. Adapting the new technology, the industrial I/O
communication port expansion now takes the new bus with easy and convenient
connectivity.

Plugging the USB Industrial I/O Adapter to the USB port, the adapter is automatically
detected and installed. There are no IRQ & COM port conflicts, since the port doesn't
require any additional IRQ, DMA, memory as resources on the system. The serial port
functions as native Windows COM port, and is compatible with Windows serial
communication applications.

The USB Industrial I/O Adapter provides instant connectivity to RS-422/485
communication device for factory automation equipment, multi-drop data collection
devices, barcode readers, time clocks, scales , data entry terminals, PC to PC long
distance communications and serial communication in harsh environments. The
USB Industrial I/O provides industrial solution for applications requiring single node
or multi-drop communications over short and long distance.






Optical Isolation & Surge Protection
Optical Isolation & Surge Protection

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Optical isolation and surge protection are available to 3 models :

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USB-COMi-SI USB to Single RS-422/485 Adapter
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USB-2COMi-SI USB to Dual RS-422/485 Adapter
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USB-4COMi-SI USB to Quad RS-422/485 Adapter

Each RS-422/485 port is individually optically isolated with 2000 volt DC optical
isolation. The optical isolation protects your PC or notebook from spikes and surges
on the RS-422/485 network, by converting the electrical pulse into an optical signal
and then changing it back into an electrical pulse. Your computer is well protected,
since the surges and spikes cannot cross the optical link.

Each RS-422/485 port is individually protected by surge protector to withstand
electrostatic discharge and power surges up to 25KV ESD. Surge suppression on all
signals prevent from damages caused by lighting or high voltage.

Power Supply
Power Supply



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The single port versions, USB-COMi & USB-COMi-SI, are powered by the USB port.
No external power supply is needed.

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The dual & quad port versions require an external power adapter.
The USB-2COMi, USB-2COMi-SI, USB-4COMi, USB-4COMi-SI are provided with an
external power adapter in the package. You need to plug the power adapter to the
power source first before driver installation.


Hardware Installation
Hardware Installation



Inside the unit, there is a 10 x 2 ( 20 pin ) header block which is jumpered to select the
mode of operation. You will need to open up the plastics covers and set the jumper
settings to RS-422 mode or RS-485 mode as per the requirements of your application.
After the setting of jumpers and connecting power supply to the adapter, you then
plug the adapter to USB port to start driver installation. The RS-422 & RS-485 Mode
Block Configuration Settings are listed as follows.

Example jumper block setting ( RS-422 mode )


1
2
4
6
8
10
3
5
7
9
12 14
16 18
20
11 13 15 17
19
3
RS
RS--422 Mode Block Con
422 Mode Block Configuration
figuration



Jumper
Function
1-2
TxD / RxD Termination of 120 Ohm. This jumper should always be
populated for RS-422.
3-4
CTS/ RTS Termination of 120 Ohm. This jumper should always be
populated for RS-422.
9-10
TxD Driver Always On. As RS-422 is full duplex point to point, the
transmitter should always be enabled.
13-14
RxD Always Enabled. As RS-422 is full duplex point to point, the
receiver should always be enabled.
17-18
Enable CTS Handshaking. This setting allows the data flow to be
controlled using CTS/RTS handshaking if required by the
application.

Note : all other positions = no jumper populated.



RS
RS--485 Mode Block Configuration
485 Mode Block Configuration



Jumper
Function
1-2
TxD / RxD Termination of 120 Ohm. This jumper should only be
populated at each end of the cable to meet RS-485 termination
requirements.
5-6
7-8
TxD / RxD Single Pair ( half duplex for RS485 ). Populate both these
jumpers.
11-12
Enable TxD Driver only when transmitting. This is required by RS485
as multiple devices can transmit over the same twisted pair. When a
RS-485 is not transmitting, its transmitter must be turned off to
allow other devices to communicate over the same wires.
EITHER
13-14


OR
15 - 16


RxD Always Enabled. In this mode characters transmitted by the
RS485 device will also be received by the same device. These
echoed characters are usually stripped out by the application
software.

Transmit Data Echo Suppression Mode. In this mode characters
transmitted by the RS485 device will NOT be received by the same
device. In this mode there is no need for the application software to
strip out the transmitted data from the received data as it is handled
by the hardware.
19-20
CTS Always Enabled. As there is no hardware handshaking in
RS-485 , CTS should be permanently enabled to allow unrestricted
flow of data. If handshaking is required for RS-485 it can be done
using X-On / X-Off handshaking protocol.

Note : all other positions = no jumper populated.

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Driver Installation
Driver Installation

Windows 98 / SE/ ME Driver Installation
1. Plug in the USB connector into the USB port on the Adapter, and connect
the USB connector on the other end of the cable to the host USB port in
your computer.
2. The connection brings up a "Building Driver Information Database"
followed by the Add New Hardware Wizard.
3. The "Add New Hardware Wizard" searches for the new drivers for USB
Serial Adapter. Click "Next".
4. Select "Search for the best driver for your device" and click "Next".
5. Select "Specify a location" and click "Next". In the "Copy Manufacturer's
file from", type "D:\Win98\USB_Driver\USB-COM" where "D" is the
location of your CD-ROM.
6. Windows driver file searches for the device "USB-COM Serial Adapter"
7. Click "Next" to continue.
8. Windows has finished installing the software. Click "Finish" to complete
installation.

Note: The "Add New Hardware Wizard" will appear again if you are installing USB
Multiple Serial Ports Version, e.g. USB-2COM/i or USB-4COM/i. You need to repeat
the installation procedures one more time for Dual- port version, and three more
times for Quad-port version.

Check Installation
Check Installation

You can now verify the installation has completely successfully by looking under
Device Manager of the System Properties screen. (Go there by Start-Setting-Control
Panel-System-Device Manager).
The device should have installed as a "USB Serial Port (COMx)" attached to "USB
High Speed Serial Converter".

Change COM Port Properties & COM Port Number
Change COM Port Properties & COM Port Number

This feature is particularly useful for programs, such as HyperTerminal, which only
work with COM1 through COM4. Please ensure that you do not change the COM Port
Number already in use.

To change the virtual COM port properties:
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Select the "USB Serial Port"
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Click "Properties".
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Select "Port Setting"
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Select "Advanced"
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Click the drop down arrow on COM Port Number and scroll to the required COM
port.
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Select "OK".
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Return to the Device Manager Screen. You will see that the USB Serial Port
installation has been changed to the new COM Port Number.
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Windows 2000 Driver Installation


You need to have administrator privileges to install any new drivers under Wi