CoolGear USB-4COMi-SI-M User Manual

[e-mail] www.CoolGear.com

USB-4COMi-SI-M USB to Quad Opto-isolated RS-422/485 Serial Adapter Manual

Optical Isolation and Surge Protection

Features

The USB to Industrial Quad RS-422/485 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 to
Industrial Quad RS-422/485 Adapter instantly adds four industrial
communication ports to your system. By taking advantage of the USB
bus, the USB Industrial Quad RS-422/485 Adapter makes it easier than
ever to add RS-422 or RS-485 device to your system with easy plug­and-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.

The USB to Industrial Quad RS-422/485 Adapter provides instant
connectivity to four RS-422/485 communication devices 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 and surge protection are available to this product USB-4COMi-SI-M.

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 lightning or high voltage.

• Adds quad high speed RS-422 / 485 ports via USB connection

• Each RS-422/485 port is individually optically isolated with 2000 Volt DC optical isolation.

• Each RS-422/485 port is individually protected by surge protector to withstand electrostatic discharge and

power surges up to 25KV ESD.

• 384 byte receive buffer

• 128 byte transmit buffer for high speed data throughput

• Requires no IRQ, DMA, I/O port

• Data rates: 300 bps to 1M bps

• Serial Connector: four DB-9 male connectors

• Auto transmit buffer control for 2-wire RS-485 half-duplex operation

• Termination resistors installed on-board.

• RS-422 data signals: TX-, TX+, RX+, RX-, GND, RTS-, RTS+, CTS+, CTS-

• RS-485 data signals: Tx-, Tx+, Rx+, Rx-(4 wire) and data-, data+ (2 wire).

• Monitor LEDs of TxD, RxD indicating port status

[e-mail] www.CoolGear.com

Power Supply

Hardware Installation

RS-422 and RS-485 Mode Block Configuration

SW1 (PORT1), SW2 (PORT2), SW3 (PORT3), SW4 (PORT4)

Operation Mode

S1

S2

S3

S4

RS-422

4 wire with handshaking

ON↑

ON↑

OFF↓

OFF↓

RS-485

Full Duplex (4 wire)

ON↑

OFF↓

OFF↓

OFF↓

Half Duplex (2 wire) with Echo

OFF↓

OFF↓

OFF↓

ON↑

Half Duplex (2 wire) without Echo

OFF↓

OFF↓

ON↑

ON↑Note

JP5 (PORT1), JP6 (PORT2), JP7 (PORT3), JP8 (PORT4) for Termination and
Biasing Option Configuration

Jumper

Function

1-2

Pull-up Tx+ to VCC by 750 Ohm Bias resistor.
This jumper should be populated for pull-up Tx+.

3-4

Pull-down Tx- to GND by 750 Ohm Bias resistor.
This jumper should be populated for pull-down Tx-.

5-6

Rx+/- Termination of 120 Ohm.
This jumper should always be populated forRS-422 and RS485 Full-Duplex mode.

7-8

Pull-up Rx+ to VCC by 750 Ohm Bias resistor.
This jumper should be populated for pull-up Rx+.

9-10

Pull-down Rx- to GND by 750 Ohm Bias resistor.
This jumper should be populated for pull-down Rx-.

11-12

CTS Termination of 120 Ohm.

• Self-powered. Power adapter of 5V, 1.6 Amp included

• Virtual COM port drivers available for Windows 7, Vista, 2003, XP, 2000.

This 4-port RS-422/485 Adapter is provided with an external switching power adapter in the package.

Outside the unit, there are four 4-pin DIP switches which are set to select the mode of operation. You will need to set
the switch settings to RS-422 mode, or RS-485 mode, as per the requirements of your application. After setting of
switches 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.

Note

Note:

In the most common situations, a 120 Ohm termination resistor of TxD (S4 is ON ) is required in a RS485

Half Duplex configuration. Otherwise it is rarely used.

Inside the unit, there are four 6x2 (8pin) header blocks which are jumped to enable Rx, CTS 120 Ohm termination
resistors and RX, Tx 750 Ohm biasing resistor. You will need to open up the case and set the jumper setting for RS-422
mode or RS-485 mode as per the requirements of your application. Settings are listed as follows.

[e-mail] www.CoolGear.com

This jumper should always be populated for RS-422 mode.

Windows 7/ Vista / 2003 / XP / 2000 Driver Installation

Note: Sometimes, when operating in RS-422 or RS-485, it is necessary to configure termination and biasing of the data
transmission lines. Generally this must be done in the cabling, since this depends on the installation of connections.
Before applying the option, check your cable specification for proper impedance matching.

Biasing of data lines must only occur at a single point anywhere in the cabling. The USB-4COMi-M provides biasing for
ease of installation. Please be sure to disable this inside the unit, if your cabling already provides biasing.

Termination must not be installed in the middle of the cable. It is only permitted at both ends. Since a computer
controlled serial port is almost always at one end of the cable, termination is enabled by default. Rx-Termination is
inside the box, because you hardly ever need to change it. Tx-Termination is used in Half-Duplex modes. In this situation
data is sent and received via Tx+/- lines. Therefore Tx-Termination is done via DIP-Switch (see S4 above).

You need to have administrator privileges to install any new drivers under Windows 7/ Vista / 2003/ XP / 2000. To install
the driver or update the configuration please log onto Windows as "Administrator" or ask your system administrator to
install the USB-COM driver.

Note: You need to install driver first, prior to hardware installation. Do not connect the USB-to-Serial Adapter to the USB
port of your computer, before you finish driver installation.

Please proceed with the following steps to install the driver:

1. Insert the “USB COM Series Driver and Utility” CD into your CD-ROM.

2. The “USB COM Series Driver and Utility CD” dialog box appears.

3. Under “Driver Installation”, double click “Windows 7, Vista, 2003, XP, 2000 driver” to install the device driver.

4. The USB COM install program will auto-detect the OS type and install the driver automatically. (Note: in

Windows 7 or Vista OS you will find another dialog box, please click on “OK” to confirm the drivers install
program).

5. After the message “FTDI CDM Driver installation process completed” appears, press “Enter” to complete the

driver installation.

6. Plug in the USB to Serial Adapter to the USB port of your computer. Windows will finish installing the driver files.

[e-mail] www.CoolGear.com

Uninstalling Windows 2003/XP/2000 Drivers

Check Installation

You can now verify the installation has been completed successfully by looking under Device Manager of the System
Properties screen. (Go there by Start-Setting- Control Panel-System Properties-Hardware-Device Manager.

The device should have installed as a "USB Serial Port (COMx)" attached to "USB Serial Converter (A/B or A/B/C/D)".

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:

• Select the "USB Serial Port"

• Click “Properties”.

• Select "Port Setting" and “Advanced”.

• Click the drop down arrow on COM Port Number and scroll to the required COM port. Select "OK".

• Return to the Device Manager Screen. You will see that the USB Serial Port installation has been changed to the

new COM Port Number.

Please proceed with the following steps to uninstall the 2003/XP/2000 driver:

1. Insert the “USB COM Series Driver and Utility” CD into your CD-ROM.

2. The “USB COM Series Driver and Utility CD” dialog box appears.

3. Under “Driver uninstalling”, double click “Windows 2003, XP, 2000 driver uninstall” to uninstall the device

driver.

4. When following dialog box appears, double click “Clean System” to uninstall the 2003/XP/2000 drivers.

[e-mail] www.CoolGear.com

5. You need to disconnect all USB to serial Adapters from your PC, when the message below appears. Double click

“OK” to start uninstalling Windows 2003/XP/2000 USB to Serial drivers.

6. Double click “Yes” to confirm it.

7. Click “No” to proceed.

8. When the message “Status: System clean completed” appears, double click “Exit” to complete the USB to serial

drivers uninstall.

[e-mail] www.CoolGear.com

9. Press “Start” button and select “Control Panel”.

10. Open the Add or Remove program.

[e-mail] www.CoolGear.com

Uninstalling Windows 7 or Vista Drivers

11. Remove the first “Windows Driver Package – FTDI CDM Driver Package (…)”.

12. Click “Chang/Remove” and “Yes” to remove the first Windows Driver Package.

13. Remove the second “Windows Driver Package – FTDI CDM Driver Package (…)”.

14. Click “Change/Remove” and “Yes” to remove the second Windows Driver Package.

15. Reboot the computer to complete the driver uninstall.

Windows 7 and Vista have many new security features. You need to proceed with the following steps to uninstall the
Vista driver:

1. The USB to serial devices must connect to the PC.

2. Press “Start” button and select “Control Panel”.

3. Select “Classic View” from the top left hand corner and then “System” from the list.

4. Select “Device Manager” from the top left hand corner.

5. Locate your Device under the Ports (COM & LTP) section and right click on it to bring up the menu shown.

[e-mail] www.CoolGear.com

6. Select uninstall and be sure to click the box for “Delete the driver software for this device” in the next window

and press “OK”.

Note: if you have more than one USB Serial Port (COMx) installed in your PC, you need to repeat from step 5 to step 6 to
delete the driver software for each port.

7. Locate your Device under the Universal Serial Bus Controllers section, and right click on it to bring up the menu

shown.

[e-mail] www.CoolGear.com

RS-422 Signal Pin-outs of DB-9 Male

Pin 1

TxD- (A)

Pin 2

TxD+ (B)

Pin 3

RxD+ (B)

Pin 4

RxD- (A)

8. Select uninstall and be sure to click the box for “Delete the driver software for this device” in the next window

and press “OK”.

Note: if you have more than one USB Serial Converter installed in your PC, you need to repeat step 7 and step 8 to
delete the driver software for all devices.

[e-mail] www.CoolGear.com

Pin 5

GND

Pin 6

RTS- (A)

Pin 7

RTS+ (B)

Pin 8

CTS+ (B)

Pin 9

CTS- (A)

RS-422 Signal Wiring

USB-4COMi-M

RS-422 Device

2 TxD+ (B)

RxD+ (B)

1 TxD- (A)

RxD- (A)

3 RxD+ (B)

TxD+ (B)

4 RxD- (A)

TxD- (A)

5 GND

GND

USB-4COMi-M

RS-422 Device

2 TxD+ (B)

RxD+ (B)

1 TxD- (A)

RxD- (A)

3 RxD+ (B)

TxD+ (B)

4 RxD- (A)

TxD- (A)

5 GND

GND

7 RTS+ (B)

CTS+ (B)

6 RTS- (A)

CTS- (A)

8 CTS+ (B)

RTS+ (B)

9 CTS- (A)

RTS- (A)

Pin 1

TxD- (A)

Pin 2

TxD+ (B)

Pin 3

RxD+ (B)

Pin 4

RxD- (A)

Pin 5

GND

Pin 1

Data- (A)

Pin 2

Data+ (B)

Pin 5

GND

• Point-to-Point 4-Wire Full Duplex

• RS-422 with Handshaking

RS-485 4-Wire (Full duplex) Signal Pin-outs of DB-9 Male Connector

RS-485 2-Wire (Half duplex) Signal Pin-outs of DB-9 Male Connector

[e-mail] www.CoolGear.com

RS-485 Signal Wiring

USB-4COMi-M

RS-485 Device

2 TxD+ (B)

RxD+ (B)

1 TxD- (A)

RxD- (A)

3 RxD+ (B)

TxD+ (B)

4 RxD- (A)

TxD- (A)

5 GND

GND

• Point-to-Point 4 Wire Full Duplex

• Multi-drop RS-485 2-Wire Half-duplex