USB MultiPort Manual
MultiPort USB
User Manual
Version 3.01
May 9th, 2016
Revision History
Revision Date
Version
Pages
Description
July/14/2006
2.0
All
All new
Aug./02/2008
2.1
Partial
Partial edited
May/13/2009
2.2
Partial
Partial edited
May/26/2009
2.3
Partial
Partial edited
Oct./26/2009
2.4
Partial
Partial edited
Feb./06/2010
2.5
Partial
Partial edited
Oct./18/2010
2.6
Partial
Partial edited
Nov./16/2010
2.7
Partial
Partial edited
July/19/2011
2.8
Partial
Partial edited
Apr./10/2012
2.9
All
Partial edited
Apr./27/2016
3.0
Partial
Modify logo and driver setup page
May/09/2016
3.01
Partial
Added driver install/uninstall process
Copyright 2016 SystemBase Co., Ltd. All rights reserved.
Websites
http://www.sysbas.com/
Phone
+82-2-855-0501
Fax
+82-2-855-0580
http://www.solvline.com/
16F Daerung Post Tower-1, 288, Digital-ro, Guro-gu, Seoul, Republic of Korea (Postal code 08390)
For any inquiries or comments,
please visit our technical support website at http://www.solvline.com/
Contents
About Multiport(Multi-N) USB series .......................................................................................... 5
Multiport USB Specifications ..................................................................................................... 6
Connectivity Method.................................................................................................................. 7
RS232................................................................................................................................ 7
RS422................................................................................................................................ 9
RS485.............................................................................................................................. 11
Termination Resistor ............................................................................................................... 13
Multi-1/USB Ver4.0.................................................................................................................. 15
- Specification .................................................................................................................. 15
1. RS232 Model ............................................................................................................... 16
2. RS422, RS485 Model ................................................................................................... 16
Multi-2/USB Ver4.0.................................................................................................................. 20
- Specification .................................................................................................................. 20
1. RS232 Model ............................................................................................................... 21
2. RS422, RS485 Model ................................................................................................... 21
Multi-4/USB Ver4.0.................................................................................................................. 25
- Specification .................................................................................................................. 25
1. RS232 Model ............................................................................................................... 26
2. RS422, RS485 Model ................................................................................................... 26
Multi-4U Ver1.7 ....................................................................................................................... 30
- Specification .................................................................................................................. 30
1. RS232 Model ............................................................................................................... 31
2. RS422, RS485 Model ................................................................................................... 31
Multi-8U Ver1.7 ....................................................................................................................... 37
- Specification .................................................................................................................. 37
1. RS232 Model ............................................................................................................... 38
2. RS422/RS485 Model.................................................................................................... 38
Multi-4U/8U V1.6..................................................................................................................... 44
1. RS232 Model ............................................................................................................... 44
2. Combo (RS422/RS485) Model ..................................................................................... 45
Manually Installing Windows Device Driver.............................................................................. 49
Automatic Driver Installation in Windows ................................................................................. 53
Windows Device Driver Setup ................................................................................................. 54
Manually Removing Windows Device Driver............................................................................ 57
Automatic Driver Uninstallation in Windows ............................................................................. 62
Multi-4U/8U Version History .................................................................................................... 63
About Multiport(Multi-N) USB series
USB is a complex word of “Universal”, meaning all peripheral devices use the same connector,
and “serial”, meaning devices are connected as a daisy chain through serial transmission. USB
is an interface suggesting a solution to inconvenience and inefficiency caused by slow speed
and limited device connection of existing external ports (serial or parallel). Compared to external
ports that were only used to connect devices such as modems, printers and scanners, USB is
powerful in that it connects all types of basic peripheral devices that were each connected via
different types. Also, when a new device is plugged, it is auto-detected without any rebooting or
setup process, enabling 127 connections maximum. Installation is handy since PnP (plug and
play) is supported. No extra equipment is needed since most of the main-board chipsets include
the USB controller.
USB cable type supported is type A, which can utilize the USB port of a computer or the USB
hub. This product obtains power from USB, and this makes the product powerful since no
external power supply is required.
Multiport USB Specifications
Multiport USB Specifications
- Hardware

Number of Ports: 1, 2, 4, 8

USB Interface: USB Specification 1.1/2.0

Serial Interface: RS232 or COMBO (422/485)

LED: Tx LED and Rx LED per each port

Serial Connector: DB9 (Male) 1,2,4
DB9 (Female) 4/8 Panel type

Serial Communication Speed: 921.6Kbps maximum

External Power: Optional *1
- Software (Driver)

Supports Windows 7/8/8.1/10
Windows Server 2008/2012
Linux Driver *2
Both 32 bit and 64 bit operating systems are supported.
*1: You can connect an external power supply to panel type USB Multiport H/W ver. 1.6 or
above.
*2: If you would like to use USB Multiport for Linux, please visit technical website at
http://www.solvline.com
Connectivity Method
Connectivity Method
RS232
How to connect to a terminal
1
6
2
PC
7
3
8
4
9
5
DCD
DSR
RXD
RTS
TXD
CTS
DTR
RI
GND
DCD
DSR
RXD
RTS
TXD
CTS
DTR
RI
GND
1
DCD
DSR
RXD
RTS
TXD
CTS
DTR
RI
GND
1
6
2
7
3
8
Terminal
4
9
5
How to connect to a modem
1
6
2
7
PC
3
8
4
9
5
DCD
DSR
RXD
RTS
TXD
CTS
DTR
RI
GND
6
2
7
3
8
4
9
5
Modem
Connectivity Method
RS422
Point-to-Point Mode Connection
1
1
6
6
2
7
PC
3
8
RX+
RXTX+
TX-
RX+
RXTX+
TX-
2
7
3
8
4
4
5
5
9
9
Multi-Drop Mode Connection
1
1
6
2
7
PC
3
8
RX+
RXTX+
TX-
RX+
RXTX+
TX-
6
2
7
3
Device 1
8
4
4
5
5
9
9
1
RX+
RXTX+
TX-
6
2
7
3
8
4
9
5
※ Please check the pin out of your device before connecting
(More example in the next page.)
Device 2
Connectivity Method
RS485
Connectivity Method
1
1
6
6
2
2
7
PC
3
8
TRX+
TRX-
TRX+
TRX-
7
3
Device 1
8
4
4
5
5
9
9
1
6
2
TRX+
TRX-
7
3
8
4
9
5
※ Please check the pin out of your device before connecting
Device 2
Termination Resistor
Termination Resistor
What is a termination resistor?
The purpose of using a termination resistor is to reduce the reflection wave in a network. Our
USB to serial devices use 120 Ω resistor in RS422/RS485 communication when enabled.
Installation
RS422 Mode
1
1
6
2
7
PC
3
8
RX+
RXTX+
TX-
RX+
RXTX+
TX-
6
2
7
3
Device 1
8
4
4
5
5
9
9
1
RX+
RXTX+
TX-
6
2
7
3
8
4
9
5
Device 2
Termination Resistor
RS485 Mode
1
1
2
2
6
6
7
PC
3
8
TRX+
TRX-
TRX+
TRX-
7
3
Device 1
8
4
4
5
5
9
9
1
6
2
TRX+
TRX-
7
3
8
4
9
5
Device 2
Multi-1/USB Ver4.0
Multi-1/USB Ver4.0
Multi-1/USB Ver4.0 is a model that supports USB1.1 and USB 2.0. It is detected automatically
when it is connected to a USB port with a computer using Linux or Windows. It supports
maximum communication speed of 921.6Kbps. Furthermore, it is equipped with surge protector
to protect internal systems from outer shock.
In Combo model, a user can set and/or enable communication mode and terminal resistor.
Also, the LEDs are attached outside to show the current status of communication.
- Specification
Communication Speed
Maximum 921.6Kbps
Bus Interface
USB 2.0 (Full Speed)
Signal
RS232/RS422/RS485
Controller
FTDI 223R
Connector
DB9 Male
Protection
15kV Surge Protector
Supported OS
Windows 7/8/8.1/10, Windows Server 2008/2012
Linux Kernel 2.6 and above
Manufacturer
SystemBase Co., Ltd
Multi-1/USB Ver4.0
1. RS232 Model
- DB9 Male Pin Assignment
2. RS422, RS485 Model
- DB9 Male Pin Assignment
Multi-1/USB Ver4.0
- DIP Switch Setting
ON
OFF
1
Signal
RS485
RS422
2
Echo/Non-Echo Select
Echo
Non-Echo
3
RS422 terminal resistor
Enable
Disable
4
RS485 terminal resistor
Enable
Disable
Multi-1/USB Ver4.0
- Jumper Setting
① Loosen two screws on the bottom case.
② Remove the side caps.
Look at the rear side of case, you can find the small grooved.
③ Top cover is slid to the inside of the case.
Multi-1/USB Ver4.0
10M: Disable slew rate limit feature. Maximum communication speed for this
mode is at 921.6Kbps.
250K: Enable slew rate limit feature. Communication speed is limited to under
250Kbps.
The slew rate limit feature allows communication without errors by activating slew-rate driver to
reduce reflection waves and EMI electromagnetic waves. However, communication speed is
limited when it is enabled.
Multi-2/USB Ver4.0
Multi-2/USB Ver4.0
Multi-2/USB Ver4.0 is a model that supports USB2.0. It is detected automatically when it is
connected to a USB port with a computer using Linux or Windows. It supports maximum
communication speed of 921.6Kbps. Furthermore, it is equipped with surge protector to protect
internal systems from outer shock.
In Combo model, a user can set and/or enable communication mode and terminal resistor.
Also, the LEDs are attached outside to show the current status of communication.
- Specification
Communication Speed
Maximum 921.6Kbps
Bus Interface
USB 2.0
Signal
RS232/RS422/RS485
Controller
FTDI 2232H
Connector
DB9 Male
Protection
15kV Surge Protector
Supported OS
Windows 7/8/8.1/10, Windows Server 2008/2012
Linux Kernel 2.6 and above
Manufacturer
SystemBase Co., Ltd
Multi-2/USB Ver4.0
1. RS232 Model
- DB9 Male Pin Assignment
2. RS422, RS485 Model
- DB9 Male Pin Assignment
Multi-2/USB Ver4.0
- DIP Switch Setting
ON
OFF
1
Signal
RS485
RS422
2
Echo/Non-Echo Select
Echo
Non-Echo
3
RS422 terminal resistor
Enable
Disable
4
RS485 terminal resistor
Enable
Disable
Multi-2/USB Ver4.0
- Jumper Setting
① Loosen four screws on the bottom case.
② Remove the side caps.
Look at the rear side of case, you can find the small grooved.
③ Top cover is slid to the inside of the case.
Multi-2/USB Ver4.0
10M: Disable slew rate limit feature. Maximum communication speed for this
mode is at 921.6Kbps.
250K: Enable slew rate limit feature. Communication speed is limited to under
250Kbps.
The slew rate limit feature allows communication without errors by activating slew-rate driver to
reduce reflection waves and EMI electromagnetic waves. However, communication speed is
limited when it is enabled.
Multi-4/USB Ver4.0
Multi-4/USB Ver4.0
Multi-4/USB Ver4.0 is a model that supports USB2.0. It is detected automatically when it is
connected to a USB port with a computer using Linux or Windows. It supports maximum
communication speed of 921.6Kbps. Furthermore, it is equipped with surge protector to protect
internal systems from outer shock.
In Combo model, a user can set and/or enable communication mode and terminal resistor.
Also, the LEDs are attached outside to show the current status of communication.
- Specification
Communication Speed
Maximum 921.6Kbps
Bus Interface
USB 2.0
Signal
RS232/RS422/RS485
Controller
FTDI 4232H
Connector
DB9 Male
Protection
15kV Surge Protector
Supported OS
Windows 7/8/8.1/10, Windows Server 2008/2012
Linux Kernel 2.6 and above
Manufacturer
SystemBase Co., Ltd
Multi-4/USB Ver4.0
1. RS232 Model
- DB9 Male Pin Assignment
2. RS422, RS485 Model
- DB9 Male Pin Assignment
Multi-4/USB Ver4.0
- DIP Switch Setting
ON
OFF
1
Signal
RS485
RS422
2
Echo/Non-Echo Select
Echo
Non-Echo
3
RS422 terminal resistor
Enable
Disable
4
RS485 terminal resistor
Enable
Disable
Multi-4/USB Ver4.0
- Jumper Setting
① Loosen eight screws on the bottom case.
② Remove the side caps.
Look at the rear side of case, you can find the small grooved.
③ Top cover is slid to the inside of the case.
Multi-4/USB Ver4.0
10M: Disable slew rate limit feature. Maximum communication speed for this
mode is at 921.6Kbps.
250K: Enable slew rate limit feature. Communication speed is limited to under
250Kbps.
The slew rate limit feature allows communication without errors by activating slew-rate driver to
reduce reflection waves and EMI electromagnetic waves. However, communication speed is
limited when it is enabled.
Multi-4U Ver1.7
Multi-4U Ver1.7
Multi-4U Ver1.7 is a model that supports USB2.0. It is detected automatically when it is
connected to a USB port with a computer using Linux or Windows. It supports maximum
communication speed of 921.6Kbps. Furthermore, it is equipped with surge protector to protect
internal systems from outer shock.
If you use 5VDC adapter, the power can be supplied to 9th pin of DB9 with maximum 1A.
In Combo model, a user can change communication mode with the switch.
Also, the LEDs are attached outside to show the current status of communication.
- Specification
Communication Speed
Maximum 921.6Kbps
Bus Interface
USB 2.0
Signal
RS232/RS422/RS485
Controller
FTDI 4232H
Connector
DB9 Male
Protection
15kV Surge Protector
Supported OS
Windows 7/8/8.1/10, Windows Server 2008/2012
Linux Kernel 2.6 and above
Manufacturer
SystemBase Co., Ltd
Multi-4U Ver1.7
1. RS232 Model
- DB9 Male Pin Assignment
2. RS422, RS485 Model
- DB9 Male Pin Assignment
Multi-4U Ver1.7
DIP Switch Setting
1
2
Signal
Mode
OFF
OFF
RS422
Point to Point
OFF
ON
RS422
Multi-Drop
ON
OFF
RS485
Non-echo
ON
ON
RS485
Echo
Multi-4U Ver1.7
-Jumper Setting
- RS232
RI: Use 9th pin of DB9 connector as RI signal (Default)
Power: Use 9th pin of DB9 connector to supply +5V DC power.
(Requires an adapter.)
Multi-4U Ver1.7
- COMBO
NONE: Do not supply any power to 9th pin of DB9. (Default)
+5V: Use 9th pin of DB9 to supply +5V DC power.
(Requires an adapter.)
Multi-4U Ver1.7
10M: Disable slew rate limit feature. Maximum communication speed for this
mode is at 921.6Kbps. (Default)
250K: Enable slew rate limit feature. Communication speed is limited to under
250Kbps.
The slew rate limit feature allows communication without errors by activating slew-rate driver to
reduce reflection waves and EMI electromagnetic waves. However, communication speed is
limited when it is enabled.
Multi-4U Ver1.7
NONE: Disable termination resistors.
422: Enable RS422 terminal resistor
485: Enable RS485 terminal resistor
Multi-8U Ver1.7
Multi-8U Ver1.7
Multi-8U Ver1.7 is a model that supports USB2.0. It is detected automatically when user
connects USB port with computer. It supports maximum communication speed of 921.6Kbps.
Furthermore, it is equipped with surge protector to protect internal systems from outer shock.
And, when a DC adapter is used, it can supply power thorough 9th pin of DB9 with maximum
1A.
In Combo model, a user can set a communication mode with the switch.
Also, the LED is attached outside to show the current status of signal lines.
- Specification
Communication Speed
Max 921.6Kbps
Bus Interface
USB 2.0
Signal
RS232/RS422/RS485
Controller
FTDI 4232H
Connector
DB9 Male
Protection
15kV Surge Protector
Supported OS
Windows 7/8/8.1/10, Windows Server 2008/2012
Linux Kernel 2.6 and above
Manufacturer
SystemBase Co., Ltd
Multi-8U Ver1.7
1. RS232 Model
- DB9 Male Pin Assignment
2. RS422/RS485 Model
- DB9 Male Pin Assignment
Multi-8U Ver1.7
DIP Switch Setting
1
2
Signal
Mode
OFF
OFF
RS422
Point to Point
OFF
ON
RS422
Multi-Drop
ON
OFF
RS485
Non-echo
ON
ON
RS485
Echo
Multi-8U Ver1.7
-Jumper Setting
- RS232
RI: Use 9th pin of DB9 connector as RI signal (Default)
Power: Use 9th pin of DB9 connector to supply +5V DC power.
(Requires an adapter.)
Multi-8U Ver1.7
- COMBO
NONE: Do not supply any power to 9th pin of DB9. (Default)
+5V: Use 9th pin of DB9 to supply +5V DC power.
(Requires an adapter.)
Multi-8U Ver1.7
10M: Disable slew rate limit feature. Maximum communication speed for this
mode is at 921.6Kbps. (Default)
250K: Enable slew rate limit feature. Communication speed is limited to under
250Kbps.
The slew rate limit feature allows communication without errors by activating slew-rate driver to
reduce reflection waves and EMI electromagnetic waves. However, communication speed is
limited when it is enabled.
Multi-8U Ver1.7
NONE: Disable termination resistors.
422: Enable RS422 terminal resistor.
485: Enable RS485 terminal resistor.
Multi-4U/8U V1.6
Multi-4U/8U V1.6
Multi-4U/8U V1.6 may operate with USB power only. But it can operate with an external adapter
when it needs more stable power supply. It can supply +5V when the device requires. This
feature is useful when small devices such as a cash box, a bar-code reader and a printer are
connected to a PC POS system. A +5V DC can be supplied even when Multi-4/8 USB is not
using an external adapter. This power is supplied through 9th pin of DB9 connector.
(Caution: Never use an adapter except +5V DC. Or else, it may damage the product.)
1. RS232 Model
- DB9 Female Pin Assignment
- External Voltage Supply Jumper
Multi-4U RS232 V1.6
Multi-4U/8U 1.6
Multi-8U RS232 V1.6
There are jumpers for each ports inside the case. Users can select modes by changing the
position of a jumper.

RI: Use 9th pin of DB9 connector as RI signal (Default)

Power: Use 9th pin of DB9 connector to supply +5V DC.
2. Combo (RS422/RS485) Model
- DB9 Female Pin Assignment
Multi-4U/8U V1.6
- Switch for selecting RS422/RS485 Signal

Multi-4U Combo V1.6

Multi-8/USB Combo V1.6
1
2
Signal
Mode
OFF
OFF
RS422
Point-to-Point
OFF
ON
RS422
Multi-Drop
ON
OFF
RS485
Non-Echo
ON
ON
RS485
Echo
Multi-4U/8U 1.6
- Port# RT: RS422, RS485 Terminal Resistor

Multi-4U Combo V1.6

Multi-8/USB Combo V1.6

422: Enable terminal resistor for RS422

485: Enable terminal resistor for RS485

NONE: Disable terminal resistors (Default)
- External Voltage Supply
- In Multi-4/8 USB Combo model, +5V is always supplied through the 9th pin of DB9 connector.
Users can connect 9th pin to the device if they require to supply +5V DC to the device.
Multi-4U/8U V1.6
- Jumper for Slew Rate Setting
The slew rate limit feature allows communication without errors by activating slew-rate driver to
reduce reflection waves and EMI electromagnetic waves. However, communication speed is
limited when it is used.

Multi-4/USB Combo V1.6

Multi-8/USB Combo V1.6
Disable Slew Rate Limit (Default)
Enable Slew Rate Limit
Driver Installation
Windows
Manually Installing Windows Device Driver

Install procedures for 64bit drivers are identical to 32bit drivers.
1.
Run Windows
2.
Connect USB Multiport to the USB port in the computer.
3.
Insert CD (provided with the product) in the CD drive
4.
Click “Hardware and Sound” from “Control Panel”
5.
Following picture shows “Device Manager” after step 4.
Click “Device Manager”.
Windows
6.
Driver Installation
Right click “USB <-> Serial Cable” in “Device Manager”. then Choose “Update Driver
Software”
7.
Click “Browse my computer for driver software” in order to install driver manually.
Driver Installation
8.
Windows
Click “Browse” and set driver software’s location to:
[CD drive letter]:\Driver\32bit or [CD drive letter]:\Driver\64bit
9.
Confirm that “USB Serial Converter” is installed. Then, right click "USB Serial Port" and
follow the same process from number 6 again.
Windows
Driver Installation
10. Following picture shows “Device Manager” after the drivers are installed.
11. “USB Multiport” installation for Window is now finished
Driver Installation
Windows
Automatic Driver Installation in Windows
This procedure applies to Windows 7, 8, 8.1, 10. (32 and 64bits)
The 32bit setup utility will not work for 64 bit Windows and 64bit setup utility will not work for 32
bit Windows either.
1.
Run Windows.
2.
Connect USB MultiPort to the USB port in the computer.
3.
Insert install CD in the CD-ROM. Open the folder named
[CD drive letter]:\Driver\32bit or [CD drive letter]:\Driver\64bit
4.
Run “USB_Serial_Driver_Setup”
5.
Click “Install”
Windows
Driver Installation
Windows Device Driver Setup
1. An advanced properties page is available for USB device. To access the advanced
properties page, open "Device Manager” from “Control Panel”. Find the USB serial port you
want to change the properties and right-click on it. Select "Properties" from the menu then
select the "Port Settings" tab to get to the window below.
Driver Setup
Windows
2. This page allows configuration of the basic device parameters (i.e. Baud rate, data bits,
parity, stop bits and flow control).
To access more advanced settings, click on the
"Advanced…" button to display the advanced properties page. (shown below)
3. This page will allow the following parameters to be altered:

COM port number: You can change the serial port number.

USB buffer sizes: Select maximum size of send or receive data

Latency timer: Alter this to correct compatibility problems for obsolete applications.

Read and write timeout values
You can alter this for timing of timeout event if there are no more Tx/Rx data.

Serial Emulator: The function of the serial enumerator is to detect a Plug-and-Play
enabled device (such as a serial mouse or serial modem) that is attached to the USB
serial port.

Serial Printer: If enabled, serial printer will disable timeouts to allow for long delays
associated with paper loading.

Cancel If Power Off: The Cancel If Power Off option can be used to assist with
problems encountered when going into a hibernate or suspend condition. This will
cancel any requests received by the driver when going into hibernate or suspend.

Event on Surprise Removal: The Event On Surprise Removal option is generally left
unselected. If an application sets SERIAL_EV_EVENT2 (refer Windows DDK) in it is
event bitmask and this feature is enabled, the device driver will signal this event on
Windows
Driver Setup
surprise removal.

Set RTS on Close: Selecting the Set RTS on Close option will set the RTS signal on
closing the port.

Disable Modem Control at Startup: This option is used to control the modem control
signals DTR and RTS at startup. In normal operation, the modem control signals at
startup follow the behavior of the legacy port. However, due to timing differences
between a legacy COM port and a virtual COM port, a "spike" on one of these signals
in the legacy port can appear as an assertion of the signal in the virtual COM port.

Devices that monitor these signals can enter the wrong state after an unplug-replug
cycle on USB. Note that if \ the "Serial Enumerator" option in the property page is
selected, then the enumeration sequence causes the modem control signals to change
at startup.
So if it is necessary to select "Disable Modem Ctrl At Startup", then it is
likely that "Serial Enumerator" should be unchecked in the property page.

Don’t adjust these parameters if you can use the device without any problems.
Driver Removal
Windows
Manually Removing Windows Device Driver
1. Run “Device Manager”. Do not remove USB MultiPort from the USB port yet. USB Multiport
should be removed after all removal processes are completed.
2. “USB Serial Converter A/B/C/D” controllers and “USB Serial Port” serial ports can be found.
The number of ports may vary depending on the product you are using. Serial ports should
be removed first.
Windows
Driver Removal
3. Find ‘USB Serial Port (COM#)’ under “Device Manager->Ports->USB Serial Port (COM#)”
and right click on any “USB Serial Port”. Click “Uninstall”.
4. Check the following check box, and click “OK”.
5. Remove the rest of the USB serial ports.
Driver Removal
Windows
6. Unlike the previous Window when deleting, check box cannot be found. Click “OK” to
remove current port. Repeat step 5~6 until all serial ports are removed.
7. “USB Serial Port” removal is now completed. We will now continue with “USB Serial
Converter” removal.
8. Right click on one of the “USB Serial Converter” and click “Uninstall”.
Windows
9. Check the “check box” and click “OK”.
10. Remove rest of “USB Serial Converters”.
Driver Removal
Driver Removal
11. Repeat steps 10~11 until all USB serial converters are removed.
12. Remove USB MultiPort from USB connection port.
13. USB MultiPort drivers are now completely removed from your system.
Windows
Windows
Driver Removal
Automatic Driver Uninstallation in Windows
This procedure applies to Windows 32 and 64 bits. If you want to uninstall the device drivers
manually, please refer to manual uninstallation pages.
The 32bit setup utility will not work for 64 bit Windows and 64bit setup utility will not work for 32
bit Windows either.
1.
Run Windows.
2.
Connect USB Multiport to the USB port in the computer.
3.
Insert CD in the CD-ROM. Open the folder named
“[CD Drive Letter]:\Driver\32bit or [CD drive letter]:\Driver\64bit
4.
Run “USB_Serial_Driver_Setup”
5.
Click “Uninstall”
Appendix
Multi-4U/8U Version History
Version
Feature
V 1.0
Using V DC by 12V from an adapter
V 1.1
5V or 12V DC power supply by d-sub pin#9.
Using linear regulator for V1.0 and switching regulator for V1.1.
V 1.2
DC power has nothing to do with bus power supplied from USB port. DC
power is used to supply power to d-sub pin#9.
Use 5V DC adapter to supply 5V power
Use 12V DC adapter to supply 12V power
Provide power to d-sub pin#9 using external power supply, an adapter.
V 1.5
Providing +5V power supply to RI signal (d-sub pin #9)
DC can be used additional BUS power supply and external power supply.
DC must be used 5V adapter.
Using GL850
V 1.6
Providing +5V power supply to RI signal (d-sub pin #9)
DC can be used additional BUS power supply and external power supply.
DC must be used 5V adapter.
Using GL850A (Discontinued GL850)
V1.7
Switched to high performance USB 2.0 controller, the performance
increases by 30%
Providing +5V power supply to RI signal (d-sub pin #9)
The DC power can be used additional to BUS power supply.
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