B&B Electronics 232D4SS8 User Manual

8 Port Smart Switch CE

Model 232D4SS8

Documentation Number 232D4SS84502

This product designed and manufactured in Ottawa, Illinois USA

of domestic and imported parts by

International Headquarters

B&B Electronics Mfg. Co. Inc.

707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA

Phone [phone] -- General Fax [phone]

Home Page: www.bb-elec.com

Sales e-mail: [e-mail] -- Fax [phone]

Technical Support e-mail: [e-mail]

European Headquarters

B&B Electronics Ltd.

Westlink Commercial Park, Oranmore, Co. Galway, Ireland

Phone [phone] -- Fax [phone]

Home Page: www.bb-europe.com

Sales e-mail: [e-mail]

Technical Support e-mail: [e-mail]

 1999 B&B Electronics -- Revised November 2002

-- Fax [phone]

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B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]

TABLE OF CONTENTS

Chapter 1: HARDWARE ......................................................1

Introduction............................................................................1

Specifications ........................................................................2

Checklist ................................................................................3

Serial Data Configuration ......................................................3

Port Configuration..................................................................4

Master Port.........................................................................4

RS-232 Configuration......................................................9

RS-422/485 Slave Port Option......................................10

RS-422/ RS-485 Mode..................................................11

Smart Switch Operation.......................................................13

Smart Switch Mode ..........................................................13

Three Character Command String ................................13

Four Character Command String ..................................14

Programming the User Defined Character....................15

Smart Switch/Port Combiner Mode ..................................16

Binary File Transfer .............................................................17

Port Select Test ...................................................................17

Chapter 2: SOFTWARE ....................................................18

Introduction..........................................................................18

Windows Selector Program Installation/Instructions ...........18

Smart Switch Setup .............................................................19

Default Values .....................................................................19

Selecting Ports ....................................................................20

Uninstalling Windows Smart Switch Selector Program .......20

APPENDIX A: ASCII Character Codes .......................... A-1

APPENDIX B: Cable Charts ...........................................B-1

Chart 1. IBM PC DB25 Connector to Master Port ............ B-1

Chart 2. IBM PC DB9 Connector to Master Port .............. B-1

Chart 3. Modem DB25 Connector to Master Port............. B-2

Chart 4. DCE w/DB25 Connector to Ports A -H (DTE).....B-2

Chart 5. IBM PC DB25 Connector to Ports A - H (DTE)... B-3

Chart 6. IBM PC DB9 Connector to Ports A - H (DTE)..... B-3

Chart 7. IBM PC DB25 Connector to Ports A - H (DTE)... B-4

Chart 8. IBM PC DB9 Connector to Ports A - H (DTE)..... B-4

Chart 9. RS-422/485 4-Wire Device to Port (A - H)

Configured as an RS-422/485 Port. ....................B-5

Chart 10. RS-485 2-Wire Device to Port (A - H)

Configured as an RS-485 Port. ...........................B-5

APPENDIX C: Declaration of Conformity .....................C-1

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Chapter 1: HARDWARE

Introduction

The RS-232 Eight Port Smart Switch (232D4SS8) allows one
RS-232 host device to connect to eight asynchronous serial
devices. Refer to Figure 1. Four RS-232 ports and four RS-232 or
RS-485 (two or four wire, send data contol) are standard on the
232D4SS8, depending on the pins you use. Other options and
additional RS-422/485 ports are available by contacting B&B
technical support. Ports configured as RS-232 support signals TD,
RD, RTS, CTS, DTR, and DSR or CD. Refer to Figure 5. Ports
configured as RS-422/485 support signals TD and RD only. Refer
to Figure 6.

The Master port is DTE or DCE configurable. RS-232 ports "A"
through "H" are configured as DTE ports. The 232D4SS8 will
switch with baud rates from 300 to 38,400 bps, 7 or 8 data bits,
even, odd or no parity, and 1 or 2 stop bits. After the switch is made
the 232D4SS8 is transparent to data flow.

There are nine red indicator LED's on the front of the
232D4SS8. Eight LED's represent ports "A" through "H" and
indicate the selected port. The ninth LED is the power on indicator.
Nine connectors are located on the back of the 232D4SS8, a DB­25S female Master port connector, and eight DB-25P male
connectors for ports "A" through "H". Refer to “Front View” diagram.

Port selection is accomplished by sending a programmable
control string to the "Master" port of the Smart Switch. This control
string consists of a user-defined character, address character, and
port character. When the 232D4SS8 receives the control string the
"Master" port will be connected to the designated port. There is no
delay through the 232D4SS8 and the data is not buffered. When
the 232D4SS8 is set to Smart Switch Mode Port "A" will be selected
at power up.

The eight ports on the 232D4SS8 can also be used as a smart
switch/port combiner. In addition to using the Master Port for port
selection, any of the eight ports can select the Master Port by
asserting their CTS line. This function is enabled by setting a switch
inside the 232D4SS8.

Documentation Number 232D4SS84502 Manual 1

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]

Specifications
Model: 232D4SS8

Size: 25.65 W x 19.05 D x 8.38 H cm

Power: 12VAC 830mA, 2.5mm power jack

Connectors: Master - DB-25 female (RS-232 or RS-422)

Slave - DB-25 male (RS-232 or RS-422/485)

Switching Baud Rate: From 300 to 38.4 Kbps

Connected Baud Rate: Any baud rate up to 115.2 Kbps

Front View

electronics

&

BB

SMART SWITCH

Rear View

AC Power

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Master Port

TD

Port Combiner

Control Lines

UART

Microcontroller

Switch
Control

Figure 1. Simplified Functional Diagram

NOTE: This diagram illustrates only the transmit data (TD) signal.

Checklist

The following equipment should be in the shipping carton:

1. Smart Switch

2. Instruction Manual

Ports "A-H"

Port A

TD

Port BTD
Port C

TDTDPort D

Port ETD

TD

Port F

Port G

TD

Port HTD

CTS

Port A

CTS

Port H

3. (2) 3 1/2" disks

If any of the items above are damaged or missing contact the
shipper immediately.

Serial Data Configuration

In order for the host device, which is connected to the Master
Port of the Smart Switch, to select a port, the Smart Switch must be
set to match the host's communication format. This is accomplished
by setting an eight position DIP switch labeled "SW1" located inside
the Smart Switch. Refer to Figure 2. Switch positions 1 through 4
select the baud rate. Switch position 5 selects 7 or 8 data bits.
Refer to Table 1. The remaining switch positions will be discussed
later. Always power down the Smart Switch before changing switch
settings.

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Table 1. Communication & Configuration Switch

DIP Switch 1

12 3456 78 Setting

0000XXXX300Baud
1000XXXX600Baud
0100XXXX1200 Baud
1100XXXX2400 Baud
0010XXXX4800 Baud
1010XXXX9600 Baud *
0110XXXX19.2KBaud
1110XXXX38.4KBaud
XXXX0XXX8DataBits*
XXXX1XXX7DataBits
XXXXX0XXSmartSwitchMode*
XXXXX1XXSmartSwitchand

Port Combiner Mode
XXXXXX0X3Char.Command*
XXXXXX1X4Char.Command
XXXXXXX0PortSelectTestOff*
XXXXXXX1PortSelectTestOn

0=OFF 1=ON X=DON'TCARE

* = FACTORY DEFAULT

Port Configuration

The 232D4SS8 has a Master port and eight selectable ports
labeled "A" through "H". Refer to “Rear View”. The Master port
should be connected to the RS-232 device that will be selecting the
ports. Ports "A - H” connect to the RS-232 or RS-422/485 devices
that will communicate with the Master port device.

Master Port

The Master port can be configured by the user as a DCE or a
DTE port. In order to determine the proper Master port
configuration of the 232D4SS8 it is necessary to have a basic
understanding of the terms DCE and DTE. RS-232 was designed,
using DB-25 connectors, for connecting a DTE (Data Terminal
Equipment) device to a DCE (Data Communication Equipment)
device. Each device will have inputs on pins that correspond to
outputs on the same pins of the other device. For example, a DTE
device transmits data out on pin 2 and a DCE device receives data
in on pin 2. IBM PC's are DTE devices, modems are DCE devices.
The Master port is shipped configured as a DCE port.

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Figure 2. Printed Circuit Board Outline

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Figure 3. Master Port DCE/DTE Jumpers

Figure 4. PC Board Options for RS-485

If an IBM PC (DTE device) is connected to the 232D4SS8
Master port, the Master port should be configured as a DCE port. If
a modem (DCE device) is connected to the Master port, it should be
configured as a DTE port. Refer to cable charts in Appendix B.

The Master port is configured as either a DCE port or a DTE
port by moving jumpers JP1: 1 through JP1: 7. JP1 is located inside
the Smart Switch. Refer to Figures 2 & 3. To configure the Master
port as a DCE port, jumpers JP1: 1 through JP1: 7 must be moved
to the DCE position. Refer to Table 2. To configure the Master port
as a DTE port, jumpers JP1: 1 through JP1: 7 must be moved to the
DTE position. Refer to Table 3.

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Table 2. DCE MASTER PORT CHART

Signal
Direction of
DCE Master

Pin # Signal Description

2
3
4
5

6*

7

8*

20
14**
15**
16**
17**

TD Transmit Data Input

RD Receive Data Output
RTS Request to Send Input
CTS Clear to Send Output
DSR Data Set Ready Output

SG Signal Ground <------>

CD Carrier Detect Output
DTR Data Term. Ready Input

TD (B) Transmit + Output
TD (A) Transmit - Output
RD (B) Receive + Input
RD (A) Receive - Input

Port

* Pins 6 & 8 are tied together inside the 232D4SS8 and
share the same output. Refer to Figure 5.

** RS-422 Master port option.

Important: All jumpers must be in the same position, either DCE or
DTE positions. Do not mix positions! Refer to Figure 3 which shows
the Master port configured as a DCE port.

CAUTION: Always power down the Smart Switch before removing

its cover.

Documentation Number 232D4SS84502 Manual 7

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]

B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]