Vscom Usb-com pro User manual

www.vscom.de

User Manual USB-COM

USB-COM PRO

Edition: June 2009

Tel: +49 40 528 401 0

Fax: +49 40 528 401 99

Web: www.visionsystems.de

Support: [email protected]

The software described in this manual is furnished under a license agreement and may be used

only in accordance with the terms of that agreement.

ited.

Trademarks

VScom is a trademark of Vision Systems GmbH. All other trademarks and brands are property of

their rightful owners.

Disclaimer

Vision Systems reserves the right to make changes and improvements to its product without pro-

viding notice.

Vision Systems provides this document “as is”, without warranty of any kind, either expressed or

implied, including, but not limited to, its particular purpose. Vision Systems reserves the right

to make improvements and/or changes to this manual, or to the products and/or the programs

described in this manual, at any time.

Information provided in this manual is intended to be accurate and reliable. However, Vision

Systems assumes no responsibility for its use, or for any infringements on the rights of third parties

that may result from its use.

This product might include unintentional technical or typographical errors. Changes are period-

ically made to the information herein to correct such errors, and these changes are incorporated

into new editions of the publication.

June 2009 USB-COM PRO User Manual 2

Contents

1 Overview 5

2 Introduction 5

2.1 Features ........................................... 5

2.2 Product Speciﬁcations ................................... 6

2.2.1 VScom USB-COM PRO .............................. 7

2.2.2 VScom USB-2COM PRO ............................. 8

2.2.3 VScom USB-4COM PRO ............................. 8

2.2.4 VScom USB-8COM PRO ............................. 9

2.3 Packing List ......................................... 9

2.4 About this Manual ..................................... 9

3 The Drivers for Windows 10

3.1 Install Drivers by Pre-Installation Executable ...................... 10

3.1.1 Check Installation of the Drivers ......................... 11

3.1.2 Uninstall Drivers from Pre-Installation Executable ............... 11

3.2 Install Drivers the Classical Way ............................. 12

3.2.1 Check Installation of the Drivers ......................... 14

3.2.2 Uninstall Drivers from Classical Way ....................... 14

3.3 Conﬁgure the Serial Ports ................................. 14

3.3.1 Rename the Serial Port .............................. 16

3.3.2 Miscellaneous Options ............................... 16

3.3.2.1 Enable faster Responses ......................... 16

3.3.2.2 Serial Enumerator ............................ 17

3.3.2.3 Serial Printer ............................... 17

3.3.2.4 Cancel if Power Oﬀ ........................... 17

3.3.2.5 Event On Surprise Removal ....................... 17

3.3.2.6 Set RTS On Close ............................ 17

3.3.2.7 Disable Modem Ctrl At Startup .................... 18

3.4 Optimizing Data Throughput ............................... 18

4 Hardware Conﬁguration 19

4.1 Conﬁguration via Windows Software ........................... 19

4.2 Conﬁguration via Terminal Program ........................... 22

4.2.1 Exit the Conﬁguration (0) ............................. 23

4.2.2 Show Port Conﬁgurations (1) ........................... 24

4.2.3 Change Port Conﬁguration (2) .......................... 24

4.2.4 Default Port Conﬁguration (3) .......................... 25

4.2.5 Save Port Conﬁgurations (4) ........................... 25

4.2.6 Show Conﬁguration File (5) ............................ 25

4.2.7 Upload Conﬁguration File (6) ........................... 26

5 Technical Background on RS485 27

5.1 Transmission Technique .................................. 27

5.2 Termination ......................................... 27

5.3 Polarization ......................................... 28

5.4 2-Wire Scheme ....................................... 28

June 2009 USB-COM PRO User Manual 3

List of Tables

5.5 4-Wire Scheme ....................................... 29

6 Connector Deﬁnitions 30

6.1 DB9 male .......................................... 30

6.2 DB25 male RS 232 ..................................... 31

6.3 Terminal Block ....................................... 31

List of Figures

1 Serial Port Hardware Options ............................... 7

2 VScom USB-COM PRO .................................. 7

3 VScom USB-2COM PRO ................................. 8

4 VScom USB-4COM PRO ................................. 8

5 VScom USB-8COM PRO ................................. 9

6 Starting Pre-Installation .................................. 11

7 Uninstall Option ...................................... 11

8 Wizard found new hardware ................................ 12

9 Help the Wizard ...................................... 13

10 Select appropriate driver .................................. 13

11 Driver installed ....................................... 14

12 USB Serial Port Properties ................................ 15

13 Advanced port options ................................... 16

14 UsbComCfg started .................................... 20

15 UsbComCfg Multi-Port Selection ............................. 21

16 UsbComCfg Multi-Device Selection ............................ 22

17 Open Terminal Conﬁguration ............................... 23

18 Terminal Main Menu .................................... 23

19 Exit Terminal Conﬁguration ................................ 23

20 Show all port conﬁgurations ................................ 24

21 Change port conﬁgurations ................................ 24

22 Conﬁgure a serial port ................................... 25

23 Saving Conﬁguration ﬁle .................................. 26

24 2-wire cabling scheme ................................... 28

25 4-wire cabling scheme ................................... 29

26 DB9 male Connector .................................... 30

27 DB25 male RS232 ..................................... 31

List of Tables

1 Features of VScom USB-COM PRO Series ........................ 6

2 Serial Port Operation Modes ............................... 6

3 Features of VScom USB-COM PRO Single Port ..................... 7

4 Features of VScom USB-2COM PRO Dual Port ..................... 8

5 Features of VScom USB-4COM PRO Quad Port .................... 8

6 Features of VScom USB-8COM PRO Octal Port .................... 9

7 DB9 male Connector .................................... 30

8 DB25 male RS232 ..................................... 31

9 Terminal Block ....................................... 31

June 2009 USB-COM PRO User Manual 4

2 Introduction

1 Overview

The VScom USB-COM are serial port adapters, which are connected to the USB port. The VScom

USB-COM PRO series are industrial strength devices, providing ﬂexible serial ports. The ports

may operate in RS232, RS422 or RS485 mode. This is completely conﬁgured by software, no

jumpers or DIP switches are required. Further the USB-COM PRO come in a metal case of IP30,

and provide the option for DIN Rail mounting.

The supplied drivers for Windows operating system install the ports into the Windows API, so

they appear as the usual Com ports. All applications capable to handle a serial port control the

connected hardware the same way as they control the built-in ports Com1 and Com2. Similar

drivers exist for other operating systems.

The driver allows to conﬁgure the serial ports for a bitrate of up to 3 Mbps. Of course RS232 can

not reliably transport very high bitrates, even under best conditions 1 Mbit/s is the limit. As the

result of the very high maximum speed, the USB-COM will generate many diﬀerent bitrates in

lower ranges. In fact every single bitrate from 185 bps up to 480000 bps is a possible transmission

speed. And above this range most bitrates up to 1 Mbit/s are also possible, e.g. 500000 bps.

The interface to the host PC is USB 2.0, Full Speed or High Speed where required.

2 Introduction

This manual describes the hardware of VScom USB-COM PRO serial port adapters. Also the

Windows driver for the USB-COM is described in detail.

2.1 Features

•USB 2.0

•Jumperless conﬁguration

•Serial port interface RS232, RS422 or RS485, by software

•Termination and BIAS resistors for RS422 or RS485, by software

•Huge FIFO buﬀers 128 Byte

•Max 3.0 Mbit/s

•Drivers for Windows™operating system

•Supported by Linux, Mac OS X, and Windows CE on several platforms.

June 2009 USB-COM PRO User Manual 5

2 Introduction

2.2 Product Speciﬁcations

The VScom USB-COM PRO all have similar properties. Most important diﬀerence is the number

of serial ports. The maximum speed is 3 Mbit/s, which may be used in RS422 or RS485 mode,

RS232 is limited.

Host interface USB 2.0 Full Speed or High Speed

Connector Type B

Serial Ports 1, 2, 4, 8 RS232 / RS422 / RS485

Signals RS232 RxD, TxD, RTS, CTS, DTR, DSR, DCD, RI, GND

RS422 / RS485 Tx±, Rx±, GND

RS485 Data±

Max. Bitrates 3.0 Mbit/s RS422 and RS485

500 kbit/s RS232

Serial conﬁgurations Data bits 7, 8

Parity None, Odd, Even, Mark, Space

Stop bits 1, 2

FIFO size 128 Bytes At least, for Transmit and Receive each

LED Data Transmit and Receive

Mode 3-Color LED

Power Red LED

Table 1: Features of VScom USB-COM PRO Series

Each of the serial ports may be used in 8 diﬀerent operation modes as listed below. The Mode

LED related to each port is light in a certain color to indicate the mode used.

Mode Comment LED

RS485 “4w”

RTS

Full-Duplex, Transmitter controlled by RTS signal Orange

RS485 “2w”

RTS no Echo

Half-Duplex, Transmitter controlled by RTS signal,

sent data is suppressed

Orange

RS485 “2w”

RTS Echo

Half-Duplex, Transmitter controlled by RTS signal,

sent data is received

Orange

RS485 “4w”

auto

Full-Duplex, Transmitter activates automatic Orange

RS485 “2w”

auto no Echo

Half-Duplex, Transmitter activates automatic, sent

data is suppressed

Orange

RS485 “2w”

auto Echo

Half-Duplex, Transmitter activates automatic, sent

data is received

Orange

RS422 Green

RS232 Red

Table 2: Serial Port Operation Modes

RS422 is a Full-Duplex mode by deﬁnition, RS485 may be used in Half- or Full-Duplex. Half-

Duplex is also known as “2 wire” and denoted as “2w” here, while “4w” speciﬁes the “4 wire”

Full-Duplex mode. Since in Half-Duplex the wires to transmit and receive data are the same, it is

June 2009 USB-COM PRO User Manual 6

2 Introduction

possible to receive the data while they are sent out of the port. This option is named Echo, and it

can be deselected.

The transmitter for Tx lines in RS485 mode may be controlled by the application via RTS signal,

as well as by an internal automatic hardware circuitry.

Option Result

BIAS Polarize Tx+/Rx+to +5V, Tx−/Rx−to GND

TxTerm 120Ωresistor from Tx+to Tx−

RxTerm 120Ωresistor from Rx+to Rx−

Figure 1: Serial Port Hardware Options

The modes of RS422 and RS485 allow to conﬁgure BIASing of the data lines, as well as connecting

120Ωtermination resistors between the positive and negative wire. These three options can be

selected per port, they are disabled if the port is in RS232 mode.

2.2.1 VScom USB-COM PRO

Figure 2: VScom USB-COM PRO

Serial Ports 1

Connectors 1×DB9 male RS232, RS422, RS485 (6.1)

1×Terminal block RS422, RS485 (6.3)

Power Bus powered

FIFO size 128 Bytes Transmit

256 Bytes Receive

LED Power On Top: Red LED

2×Data On Top: Transmit Green, Receive Yellow

1×Mode On Top: 3-Color

Table 3: Features of VScom USB-COM PRO Single Port

June 2009 USB-COM PRO User Manual 7

2 Introduction

2.2.2 VScom USB-2COM PRO

Figure 3: VScom USB-2COM PRO

Serial Ports 2

Connectors 2×DB9 male RS232, RS422, RS485 (6.1)

2×Terminal block RS422, RS485 (6.3)

Power Bus powered

FIFO size 128 Bytes Transmit

384 Bytes Receive

LED Power On Top: Red LED

4×Data On Top: Transmit Green, Receive Yellow per port

2×Mode On Top: 3-Color

Table 4: Features of VScom USB-2COM PRO Dual Port

2.2.3 VScom USB-4COM PRO

Figure 4: VScom USB-4COM PRO

Serial Ports 4

Connectors 4×DB9 male RS232, RS422, RS485 (6.1)

Power Self powered Shipped with 5V DC adapter

FIFO size 128 Bytes Transmit

384 Bytes Receive

LED Power On Front: Red LED

8×Data In Block on Front: Transmit Green, Receive Yellow

4×Mode Near Port: 3-Color

Table 5: Features of VScom USB-4COM PRO Quad Port

June 2009 USB-COM PRO User Manual 8

2 Introduction

2.2.4 VScom USB-8COM PRO

Figure 5: VScom USB-8COM PRO

Serial Ports 8

Connectors 8×DB9 male RS232, RS422, RS485 (6.1)

Power Self powered 110V - 240V AC, 48 - 67 Hz

FIFO size 128 Bytes Transmit

384 Bytes Receive

LED Power On Front: Red LED

16×Data In Block on Front: Transmit Green, Receive Yellow

8×Mode Near Port: 3-Color

Table 6: Features of VScom USB-8COM PRO Octal Port

2.3 Packing List

All models are shipped with a driver CD-ROM, which includes the documentation and the driver

software.

•USB 2.0 High Speed cable

•CD-ROM with drivers, conﬁguration software and manuals

•Metal plates for Wall mounting or DIN Rail clips

•Power supply hardware if required

2.4 About this Manual

This manual describes the hardware of VScom USB-COM PROs, as well as signal assignments of the

serial connectors. The screen shots in here are made on an English language version of Windows XP.

It is not diﬃcult to ﬁnd the appropriate part in any other language version of Windows. The current

version of the driver is 2.04.16, the version of the ﬁrmware in VScom USB-COM PRO is 1.0.0.

Usually any hardware conﬁguration is described before the software, including drivers. However

the conﬁguration of VScom USB-COM PRO requires the serial port drivers installed, so these are

covered ﬁrst.

June 2009 USB-COM PRO User Manual 9

3 The Drivers for Windows

This chapter of the manual documents the drivers for Windows Operating Systems. The driver is

the same for all USB-COM available, independent of the model. As one consequence there is only

one driver for download, linked to from all the products. It does not matter which link you use.

The USB-COM appear in Windows as several components, depending on the speciﬁc model. This

can be seen in the Device Manager, while or after installation of the drivers.

•Single port models appear as a “USB FAST SERIAL ADAPTER”, which ﬁnally installs as

a “USB Serial Converter” plus a “USB Serial Port”.

•Dual port models appear as a “USB Composite Device” ﬁrst, which installs USB Serial

Converter A and B. These then install the serial ports.

•Some quad port models also appear as a “USB Composite Device” ﬁrst, which installs USB

Serial Converter A to D. These four converters then install the serial ports.

•Multiport models with 4 to 16 serial ports ﬁrst appear as one or two “Generic USB Hub”,

plus some USB Composite Devices. These install USB Serial Converter A and B or A to D

each. The converters then install all the serial ports.

Windows already has a driver for a USB Hub, and it also handles USB Composite Devices without

conﬁguration and help by the user. The speciﬁc drivers are for the USB Serial Adapters, and the

USB Serial Ports installed by them.

The manual ﬁrst describes the process of installing the driver software, followed by instructions

for removing the drivers in the unlikely case you wish to do this. After this the conﬁguration of

the serial ports is described. There is no option to conﬁgure the other drivers installed for the

USB-COM, so the options are the same for all diﬀerent models.

Many USB-COM may be installed simultaneously. In fact the driver does not limit the number of

USB-COM installed, Windows does. In Windows the maximum number of serial ports installed

is 256, no matter which driver installed and controls them. The current version of the driver is

2.04.16.

With the current driver version there are two methods of installation. There is the classical variant,

where Windows detects the new hardware as soon as it is connected to the PC. Then Windows

requests the driver from the user, and installs them. The modern way of installation uses a Pre-

Installation Executable to put the drivers onto the system, when the hardware is not yet connected

to the PC. When it is connected later, Windows already knows about the drivers, and installs them

without further interaction by the user.

3.1 Install Drivers by Pre-Installation Executable

Do not connect the USB-COM to your PC. The driver installation program is usually named as

USBCom-CDM_20416.exe, depending on the version number. This ﬁle is found on the driver

CD-ROM, in the top folder. Just log on to Windows with Administrator privileges, and start the

program. It is a self-extracting archive, which in turn executes the included installation software.

The installation is a text-mode Console Application, which pretty much looks like a DOS box (see

ﬁgure 6).

June 2009 USB-COM PRO User Manual 10

3 The Drivers for Windows

Figure 6: Starting Pre-Installation

When the operation is ﬁnished, this box closes. No interaction is required. The result of this process

is a Windows system which has the USB-COM added as know hardware. This installation process

also added an entry in “Control Panel” (actually two entries), in the “Add or Remove Programs”

applet. The drivers may be uninstalled by this entry.

Figure 7: Uninstall Option

Now connect your USB-COM to a USB port on your PC. Windows will detect the new hardware,

and attempts to install the drivers. Probably it oﬀers the option to search the Internet for more

recent drivers, just say “No, not this time” to this question. In the next steps select the Automatic

option, and click on Next and Finish as requested. Windows knows about the drivers, and installs

all components and serial ports without further interaction.

3.1.1 Check Installation of the Drivers

Open the Device Manager, and see if all serial ports are available in the “Ports” Device class.

Open the properties of each serial port. Open “Control Panel”, and the “Add or Remove Programs”

applet. The FTDI CDM Driver Package appears twice in the list of components.

3.1.2 Uninstall Drivers from Pre-Installation Executable

First disconnect all USB-COM from your system. Then open “Control Panel”, and in that start

the “Add or Remove Programs” applet. The FTDI CDM Driver Package appears twice in the list

June 2009 USB-COM PRO User Manual 11

3 The Drivers for Windows

of components. On both entries, click the Change/Remove button to remove the software from

your system. Once both entries are done, the drivers no longer exist.

This procedure not only removes all entries of USB-COM from the Device Manager, as the ﬁnal

step also the ﬁles are removed from the hard disk. As a result reconnecting a USB-COM causes

Windows to start the “New Hardware” Wizard again.

3.2 Install Drivers the Classical Way

Start Windows, and log on to the system with administrative privileges. The connect your USB-

COM PRO to a free USB port of your computer. Windows will detect the new hardware, and

identify it as an unknown type. Of course “unknown” only if this is the ﬁrst time drivers are

installed to the system. The second USB-COM PRO is recognized automatically, without further

interaction.

First Windows may detect some of the standard components mentioned above (3). The Windows

ﬁnds the “USB FAST SERIAL ADAPTER”, and requests a driver for this.

Figure 8: Wizard found new hardware

The “Found New Hardware Wizard” ﬁrst oﬀers to check on the Internet for latest drivers. Since

the latest drivers are already on the CD-ROM or downloaded and stored on your hard disk, select

the “No, not this time” option, and click on the Next button.

June 2009 USB-COM PRO User Manual 12

3 The Drivers for Windows

Figure 9: Help the Wizard

Usually Windows can not locate the best software automatically. Even if the driver is saved on

a CD-ROM, the automatic option uses a long time to search. So instead select the “(Advanced)”

option, and click on Next.

Figure 10: Select appropriate driver

Guide Windows to the directory where you saved the latest version or to the CD-ROM, and again

click on Next.

June 2009 USB-COM PRO User Manual 13

3 The Drivers for Windows

Figure 11: Driver installed

Windows copies the drivers to the system directory, and loads them. After that the installation is

done, so click on the Finish button.

But this was the installation of the “USB FAST SERIAL ADAPTER”, not the serial ports them-

selves. These are also detected as new hardware, and the process repeats for these drivers. Follow

the steps above a second time, and then you are done. Now Windows knows the required drives

for all components, and installs them without further interaction.

3.2.1 Check Installation of the Drivers

Open the Device Manager, and see if all serial ports are available in the “Ports” Device class. Open

the properties of each serial port.

3.2.2 Uninstall Drivers from Classical Way

First disconnect all USB-COM from your system. On the CD-ROM or in the downloaded ﬁles ﬁnd

the folder named “FTClean”. Inside this you’ll ﬁnd the program FTClean.exe, which is designed

to remove all USB-COM entries in the system as well as all related ﬁles from the hard disk. Just

start the software, and follow the instructions on the screen.

This method of driver removal is also valid for uninstalling the drivers, when they have been

installed by the Pre-Installation Executable software.

3.3 Conﬁgure the Serial Ports

Open the Device Manager. In the Device Manager open the device class of “Ports (COM & LPT)”1.

In this class you’ll see all the entries of “USB Serial Port”. Now open the properties of the serial

port to conﬁgure.

1“Anschlüsse (COM und LPT)” in einem deutschen Windows

June 2009 USB-COM PRO User Manual 14

3 The Drivers for Windows

Figure 12: USB Serial Port Properties

Click on the button named “Advanced...” to see the special conﬁguration options. They are

available via panel 13.

June 2009 USB-COM PRO User Manual 15

3 The Drivers for Windows

Figure 13: Advanced port options

3.3.1 Rename the Serial Port

The option “COM Port Number” on top of the advanced settings allows to rename the port. You

may select any free port number. It is Windows which refuses a change, if the new port name is

already occupied.

3.3.2 Miscellaneous Options

In the lower right corner of the Advance Options (ﬁgure 13) are some seldom changed options.

3.3.2.1 Enable faster Responses In the middle of the left part is the section named “BM Op-

tions”. The parameter “Latency Timer” can be reduced to 1 millisecond, if there are problems with

certain applications. The default value is 16, to reduce the USB protocol overhead and bandwidth

usage. Usually the serial port buﬀers incoming data for up to 16 ms, or until 62 bytes of data

are received. When either of the criteria becomes true, the data is sent to the Host PC. Then the

application software will recognize the received data. If a small amount of data is received, or the

June 2009 USB-COM PRO User Manual 16

3 The Drivers for Windows

last part of the transmission does not trigger the 62 byte limit, this causes a delay in receiving the

data. As the consequence the application can not operate on the data very early.

Usually this is not a problem, but with certain serial protocols this can cause strange eﬀects. So

a reduction to 1 ms is appropriate then, faster reactions are not possible. This is caused by the

protocol structure of USB, not by the serial port.

3.3.2.2 Serial Enumerator In the lower right corner of the advanced options is a set of options

for diﬀerent purposes.

This option is enabled by default. When the driver is started, Windows tries to detect hardware

attached to the serial port. There may be a mouse or a modem. Most often the attached device

is neither of that, so it is not a problem to disable this option. Further some devices permanently

send data to the Host, without special requests. Windows may falsely recognize such devices as

a serial mouse. This causes your pointer to randomly jump over the screen. Disabling the option

prevents this.

3.3.2.3 Serial Printer When ﬂow control like RTS/CTS stops data from being sent to the serial

port for a suﬃcient time, this will cause an error event for the application. However if the attached

serial device is a printer, sometimes this will halt for paper feed, especially for manual interaction.

This will cause the data ﬂow to stop for a signiﬁcant long time.

Enabling this option causes such errors never to be reported to the application. So printing will

never cause erroneous error messages.

3.3.2.4 Cancel if Power Oﬀ Instead of a regular shut down the computer can be sent into sleep

or hibernate mode. In this situation neither the serial port nor the driver can perform any requests.

In rare situations this can cause problems.

Enabling this option dumps any open requests for driver or hardware, if the computer is powered

oﬀ by any Suspend state.

3.3.2.5 Event On Surprise Removal Usually this option is disabled because software does not

use it. When it is enabled, application software can request to be notiﬁed if the hardware of the

serial port is removed from the system while it is in use. So instead of claiming a malfunction of

the attached serial device it can correctly report the removal of the port.

3.3.2.6 Set RTS On Close Usually the signal RTS is disabled when the port gets closed. However

some kind of serial hardware may require a permanently active RTS for correct operation. Otherwise

there may be error messages when the port is opened again to use the device.

Enabling this option causes the RTS to stay active even when the application closes the serial

port.

June 2009 USB-COM PRO User Manual 17

3 The Drivers for Windows

3.3.2.7 Disable Modem Ctrl At Startup Usually on startup the modem control signals RTS

and DTR follow the behavior of standard ports (i.e. Com1). Due to the longer timing compared

to built-in serial ports a very short enable or disable pulse on the control signals may become a

comparably long pulse on the USB serial port. Such a long pulse can cause external hardware

to malfunction. By correct conﬁguration of the serial port application software can avoid that

problem. However since it does not appear on Com1, most software does not care about that. This

option will help to “heal” such problem.

Note that if the "Serial Enumerator" option is enabled, in the enumeration sequence Windows causes

the control signals to change. So if it is necessary to select "Disable Modem Ctrl At Startup", it is

likely that "Serial Enumerator" should be disabled.

3.4 Optimizing Data Throughput

Roughly speaking, the USB allows one operation between Host PC and attached USB device per

millisecond. This is the basic reason why the Latency (see 3.3.2.1) can’t be shorter than 1 ms. But

there is a second eﬀect causing slow transmissions.

Many software sends the data to the driver byte-by-byte. This is not a problem with built-in ports

like Com1. Except for extreme high transmission rates the operation time of the driver is much

shorter than the serial transmission time. So when the second and following byte are sent to the

driver, the previous bytes did not completely leave the PC and its buﬀers. The serial port does not

run out of data.

This is diﬀerent with USB serial ports. Now matter how fast the byte is transmitted over the USB

cable (12 Mbit/s or 48Mbit/s), it takes 1 ms to send the next byte. Calculated the other way

this is 1000 byte per second, which is equivalent to 9600 bit/s. The user feels the transmission as

sluggish. Raising the serial speed does not help, since this is not the problem.

However it requires nearly the same millisecond to send one byte or more. So if the application

sends complete buﬀers instead byte-by-byte, the driver can send more than one byte per millisecond.

This way the USB serial port is permanently fed with work to send.

June 2009 USB-COM PRO User Manual 18

4 Hardware Conﬁguration

The hardware of VScom USB-COM PRO is not conﬁgured via Jumper blocks or DIP switches, as

is mentioned above. Instead this is done by software. Each model has a single button named as

“Conﬁg”. User press this button for at least 3 seconds, a blue LED inside the button will light. This

shows the device is in conﬁguration mode now. In conﬁguration mode the serial port number 1 is

disabled, the conﬁguration is done via the Com Port associated with this serial port. Pressing the

“Conﬁg” button again returns to normal operation, thus exiting from conﬁguration mode.

This way of software conﬁguration of course requires to have a driver for USB Virtual Serial Ports

on the system. That is not a problem, because without such driver the VScom USB-COM PRO

can not be used anyway. The conﬁguration parameters are saved to a non-volatile memory inside

the USB-COM PRO, so conﬁguration and use may happen on diﬀerent systems.

4.1 Conﬁguration via Windows Software

If the drivers for Windows are not installed, please do that now (chapter 3). Then locate the

program UsbComCfg.exe on your CD-ROM, or in the ﬁles downloaded from the FTP server. Close

any application currently operating via the serial port(s) provided by your USB-COM PRO. During

conﬁguration the ﬁrst (or only) serial port is disconnected from the external devices.

On your USB-COM PRO press the button named “Conﬁg” for at least 3 seconds, a LED in the

button will light in blue color. The USB-COM PRO is in conﬁguration mode now. Then start the

UsbComCfg program, it searches and detects all USB-COM PRO in conﬁguration mode.

June 2009 USB-COM PRO User Manual 19

4 Hardware Conﬁguration

Figure 14: UsbComCfg started

If a device is not in Conﬁguration mode, it is not detected. It is also not possible to ﬁnd a device,

when the ﬁrst serial port is used by an application software. UsbComCfg repeats the search when

the appropriate button is clicked.

By clicking a device in the left pane, a port in the middle pane can be selected. The operation mode

is then changed by the radio buttons and check boxes in the right pane. The button to “Commit

Changes” transfers the required parameters to the selected device. They are stored in non-volatile

RAM, and activated after that. The device remains in Conﬁguration mode.

June 2009 USB-COM PRO User Manual 20

This manual suits for next models

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VSCOM USB-COM PRO User manual

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