CB1S485 - Interface StarTech.com - Free user manual and instructions

Product Type	RS-232 to RS-485/422 Converter
Brand	StarTech.com
Model	CB1S485
Dimensions	2.5 x 1.5 x 0.8 in (63.5 x 38.1 x 20.3 mm)
Weight	3 oz (85 g)
Power Supply	Powered via RS-232 port (DB9) - no external power required
Serial Interface	RS-232 (DB9 male) to RS-485/422 (5-pin terminal block)
Data Rate	Up to 115.2 kbps
Transmission Mode	Half-duplex (RS-485) or full-duplex (RS-422)
Termination	On-board 120 Ohm termination resistor (selectable via jumper)
Protection	15 kV ESD protection on RS-485/422 lines
Isolation	2500V isolation between RS-232 and RS-485/422
Connectors	DB9 male (RS-232) and 5-pin screw terminal (RS-485/422)
Operating Temperature	0°C to 70°C (32°F to 158°F)
Humidity	5% to 95% non-condensing
LED Indicators	Power, TX, RX
Included Accessories	Terminal block plug, quick-start guide
Maintenance	Wipe with a dry cloth; do not use liquids or solvents
Safety	Use only with compatible equipment; disconnect before servicing
Spare Parts	Not available; unit is not user-serviceable
Warranty	Lifetime warranty by StarTech.com
Repairability	Non-repairable; replace if defective

Frequently Asked Questions - CB1S485 StarTech.com

What is the StarTech.com CB1S485 used for?

The CB1S485 is a RS-232 to RS-485/422 converter that allows you to connect a legacy RS-232 serial device to an RS-485 or RS-422 network.

Does the CB1S485 require external power?

No, it is powered directly from the RS-232 port (DTR and RTS signals), so no external power supply is needed.

How do I select between RS-485 and RS-422 modes?

The mode is selected via a jumper on the board. In RS-485 mode, it operates half-duplex; in RS-422, full-duplex.

What is the maximum data rate supported?

The CB1S485 supports data rates up to 115.2 kbps.

Can I use the CB1S485 with a 5V or 3.3V logic device?

Yes, it supports both 5V and 3.3V logic levels on the RS-485/422 side.

How do I wire the terminal block for RS-485?

For RS-485 half-duplex, connect Data+ (A) and Data- (B) pins. Optionally, you can enable the termination resistor jumper.

What is the maximum cable length?

RS-485 supports up to 4000 feet (1200 meters) at lower baud rates.

Does the converter provide isolation?

Yes, it features 2500V isolation between the RS-232 and RS-485/422 sides.

What do the LED indicators show?

Power LED indicates power is present; TX LED blinks on data transmit; RX LED blinks on data receive.

How can I troubleshoot if the converter is not working?

Check that the RS-232 cable is securely connected and that DTR/RTS signals provide enough power. Verify jumper settings for mode and termination. Also ensure baud rate and parity match your device.

USER MANUAL CB1S485 StarTech.com

1 Port CardBus (PCMCIA) RS422/485 Serial Laptop Adapter

CB1S485

*actual product may vary from photos

For the most up-to-date information, please visit: www.startech.com

FCC Compliance Statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

Use of Trademarks, Registered Trademarks, and other Protected Names and Symbols

This manual may make reference to trademarks, registered trademarks, and other protected names and/or symbols of third-party companies not related in any way to StarTech.com. Where they occur these references are for illustrative purposes only and do not represent an endorsement of a product or service by StarTech.com, or an endorsement of the product(s) to which this manual applies by the third-party company in question. Regardless of any direct acknowledgement elsewhere in the body of this document, StarTech.com hereby acknowledges that all trademarks, registered trademarks, service marks, and other protected names and/or symbols contained in this manual and related documents are the property of their respective holders.

Table of Contents

Introduction ....1

Packaging Contents ....1
System Requirements....1

Hardware Guide ......2

Installation 4

Driver Installation....4
RS-485 2-wire mode....5
Baud Rate 5
Application Wiring....6
RS-422 (Transmitter buffer is always enabled)....7

Specifications 8

Technical Support 9

Warranty Information 9

Introduction Packaging Contents

• 1x Serial PCMCIA Card
- 1x Breakout Cable
- 1x Driver CD
• 1x Instruction Manual

System Requirements

• A host computer with an available CardBus Slot. Please note that CB1S485 can be used on a desktop computer, using a PCMCIA to PCI Adapter Card.
• Windows® 7 (32/64bit)/ Vista(32/64)/ XP(32/64), 2000, ME, 98SE, CE 5.0 Windows® Server 2008 R2/ 2003(32/64) Linux Kernel 2.4.x/ 2.6.x

Hardware Guide

UART Input Clock Speed Selector

RS-422/485 Mode Selector

NOTE:

1. Please note that if the mode were set at "422" mode, the other settings (NECH and NLP settings) will take no effect.
2. Echo mode is used to detect data collisions. If the echoed data was not equal to the transmitted data, then data collisions are occurring.

Switch Name	Switch Positions	Clock Speed
	(Up)	UART Input Clock Speed = 1.8432MHZ, Maximum baud rate is 115.2Kbps
HSPD	(Down) (Default)	UART Input Clock Speed = 14.7456MHZ, Maximum baud rate is 926.1Kbps (default). Setting requires adjustment from Windows Device Manager

Switch Name	Jumper Positions	Mode and Termination Resistor Setting
422	Up (default)	2-wire RS-485 mode (Note)
	Down	4-wire RS-422 mode
NECH	Up	Transmitting data will be echoed back
	Down (default)	No echo data
NLP	Up	RTS will be connected to CTS
	Down (default)	RTS and CTS operate normally

Terminator Settings

DB9 Connector Pinout

Switch Name	Jumper Positions	Mode and Termination Resistor Setting
TXD	Up (default)	2-wire RS-485 mode (Note)
	Down	4-wire RS-422 mode
RXD	Up	Transmitting data will be echoed back
	Down (default)	No echo data
RTS	Up (default)	RTS will be connected to CTS
	Down	RTS and CTS operate normally
CTS	Up	CTS Terminator Disabled
	Down (default)	CTS Terminator Enabled

9 Pins Signal

1 TXD- (DATA-)

2 TXD+ (DATA+)

3 RXD+

4 RXD-

5 GND

6 RTS-

7 RTS+

8 CTS+

9 CTS-

Installation

WARNING! It is advisable to remove all possible static discharge potential from any objects that the ExpressCard may come in contact with before installation. This can be accomplished by touching a grounded metal object, prior to insertion

1. With the notebook PC powered on and fully booted, insert the PCMCIA Card into an available CardBus slot on the host computer.
2. Connect the 15-pin connector of the cable to your PC card, then connect the DB9 connector to your serial device.
3. The Add New Hardware Wizard will launch and will guide you through the driver installation process.

Driver Installation

Windows 98, ME, 2000, XP, 2003

The necessary driver files are in ZIP format (e.g. V6515_RS422_485.ZIP) and are located in E:\IO\OXFORD\RS422_485 (where E: denotes the CD/DVD-ROM drive. Please copy the file to your local hard drive (presumably C:) and unzip it before proceeding with installation.

1. When the Found New Hardware Wizard appears, click Next to continue.

1. Select Install from a list or specific location (advanced) and click Next.
2. Select Include this location in the search and click Browse to specify the driver's location.
3. Click Next to continue, then click on Finish to complete installation.

Windows NT

Because Windows NT does not support plug and play, you will need to locate the Install_Serial.exe file (in the E:\IO\OXFORD\WinNT4 folder, where E designates the location of the CD/DVD-ROM drive), and double click on the executable file. Follow the prompts to complete installation.

RS-485 2-wire mode

To enable CB1S485 to operate in RS-485 2-wire mode:

1. Right-click on My Computer. If you are using Windows 98/ME, select Properties. If you are using Windows 2000/XP, select Manage.
2. Choose Device Manager and double-click on Ports.
3. You will notice the added ports, listed as a PCI Communications Port. Double-click on the COM Port you wish to configure, and select Settings.

Windows 2000, XP

1. In the PCI Communications Port Properties window, click on the Settings tab.
2. Under Hardware config, select RS422/485, and change the RS485 buffer enable value to Active Low, using the dropdown box provided. Click OK to save and exit.

Windows 98, ME

1. In the PCI Communications Port Properties window, click on the Settings tab.

2. Change the DTR function to RS485 Buf_En Active Low, using the dropdown box provided.

Baud Rate

By default, CB1S485 is set to a baud rate of 115.2Kbps (maximum). To increase the baud rate to 921.6Kbps maximum:

Windows 2000, XP

1. As mentioned on page 2, move the HSPD switch to the down position.

2. Right-click on My Computer and select Manage.

3. Choose Device Manager and double-click on Ports.
4. You will notice the added port, listed as a PCI Communications Port. Double-click on the COM Port you wish to configure, select Data rate, click on Detect Crystal Frequency, then OK.

Windows 98/ME

1. As mentioned on page 2, move the HSPD switch to the down position.
2. Right-click on My Computer and select Properties.
3. Choose Device Manager and double-click on Ports.
4. You will notice the added port, listed as a PCI Communications Port. Double-click on the COM Port you wish to configure, select Data rate, and put a checkmark next to Detect Crystal Frequency by clicking in the box provided. Click on OK to save this setting.

Application Wiring

RS-485 (Transmitter is controlled by ATTATM Hardware)

NOTE: CB1S485 supports optional auto echo mode operation. When enabled, data sent to the connected RS-485 transmitter is simultaneously sent to the receiver. The current application can then use the "echoed" data to check for data collisions.

graph LR
    A["PC"] --> B["2-wire twisted pair cable"]
    B --> C["RS-485 Device"]
    B --> D["RS-485 PCM/CA Card"]
    D --> E["RXD-(485)"]
    D --> F["RXD-(485)"]

RS-422 (Transmitter buffer is always enabled)

graph LR
    A["Laptop"] --> B["Device"]
    B --> C["TXD+ TXD-"]
    B --> D["RXD+(485) RXD-(485)"]
    C --> E["4-wire Twisted Pair Cable"]
    D --> E
    E --> F["TX+ TX-"]
    E --> G["RX+ RX-"]

NOTE: CB1S485 supports 4-wire RS-422 mode, which requires cross-over twisted pair cable.

CB1S485 also provides two handshaking signals, RTS+/RTS- and CTS+/CTS- to perform hardware flow control, which requires the following wiring scheme:

graph LR
    A["CB1S485"] --> B["RS422 Device"]
    A --> C["TXD+"]
    A --> D["TXD-"]
    A --> E["RXD+"]
    A --> F["RXD-"]
    A --> G["RTS+"]
    A --> H["RTS-"]
    A --> I["CTS+"]
    A --> J["CTS-"]
    B --> K["TXD+"]
    B --> L["TXD-"]
    B --> M["RXD+"]
    B --> N["RXD-"]
    B --> O["RTS+"]
    B --> P["RTS-"]
    B --> Q["CTS+"]
    B --> R["CTS-"]

Specifications

Regulatory Certifications ROHS, FCC, CE

Bus Type 32-bit CardBus Type-II Slot

Connectors 1x DB9 Male Connector

Maximum Data Transfer Rate 921 kbps

OS Support

Windows® 7 (32/64bit)/ Vista(32/64)/

XP(32/64), 2000, ME, 98SE, CE 5.0

Windows® Server 2008 R2/ 2003(32/64)

Linux Kernel 2.4.x/ 2.6.x

Bits Data Framing Support 5/6/7/8/9

Technical Support

StarTech.com's lifetime technical support is an integral part of our commitment to provide industry-leading solutions. If you ever need help with your product, visit www.startech.com/support and access our comprehensive selection of online tools, documentation, and downloads.

For the latest drivers/software, please visit www.startech.com/downloads

Warranty Information

This product is backed by a two year warranty.

In addition, StarTech.com warrants its products against defects in materials and workmanship for the periods noted, following the initial date of purchase. During this period, the products may be returned for repair, or replacement with equivalent products at our discretion. The warranty covers parts and labor costs only. StarTech.com does not warrant its products from defects or damages arising from misuse, abuse, alteration, or normal wear and tear.

Limitation of Liability

In no event shall the liability of StarTech.com Ltd. and StarTech.com USA LLP (or their officers, directors, employees or agents) for any damages (whether direct or indirect, special, punitive, incidental, consequential, or otherwise), loss of profits, loss of business, or any pecuniary loss, arising out of or related to the use of the product exceed the actual price paid for the product. Some states do not allow the exclusion or limitation of incidental or consequential damages. If such laws apply, the limitations or exclusions contained in this statement may not apply to you.

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