B&B Electronics 232SS2 Manual de usuario

232SS21600 Manual Cover Page

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

Smart Switch

Model 232SS2

Document No. 232SS21600

This product Designed and Manufactured

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 (815) 433-5100 -- General Fax (815) 433-5105

Home Page: www.bb-elec.com

Sales e-mail: [email protected] -- Fax (815) 433-5109

Technical Support e-mail: [email protected].com -- Fax (815) 433-5104

1992 B&B Electronics -- Revised April 2000

B&B Electronics RESERVED. No part of this publication may be reproduced or transmitted in any form or by

any means, electronic or mechanical, including photography, recording, or any information storage and retrieval

system without written consent. Information in this manual is subject to change without notice, and does not

represent a commitment on the part of B&B Electronics.

B&B Electronics shall not be liable for incidental or consequential damages resulting from the furnishing,

performance, or use of this manual.

All brand names used in this manual are the registered trademarks of their respective owners. The use of

trademarks or other designations in this publication is for reference purposes only and does not constitute an

endorsement by the trademark holder.

232SS21600 Manual Table of Contents i

B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

TABLE OF CONTENTS

Chapter 1: INTRODUCTION...............................................1

Checklist.................................................................................2

Chapter 2: SETUP ...............................................................3

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

Serial Data Configuration.......................................................5

Smart Switch Operation.........................................................6

Programming the Second Character .....................................7

Binary File Transfer................................................................7

Smart Switch/Port Combiner Mode........................................8

Specifications.......................................................................11

Chapter 3: SOFTWARE....................................................12

Introduction ..........................................................................12

Windows SSwitch.................................................................12

DOS SSTSR ........................................................................13

Parameters...........................................................................15

Default Values......................................................................16

Help Screen .........................................................................16

Un-Install..............................................................................16

Selecting Ports.....................................................................16

Hot Key Method....................................................................17

Command Line Method........................................................17

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

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

232SS21600Manual 1

B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

Chapter 1: INTRODUCTION

The RS-232 Four Port Smart Switch/Port Combiner, Model

232SS2, allows one RS-232 host device to connect to as many as

four RS-232 devices. The switch can be controlled in two different

ways. The first way is referred to as smart switch mode. In this

mode, the switch is controlled by sending a programmable preamble

code to the "Master" port of the 232SS2. The other way the switch

can be controlled is referred to as port combiner mode. In port

combiner mode, a slave port can gain access to the master port by

asserting a handshake line. If none of the slave ports have their

handshake line asserted, the switch can be controlled using the

preamble code.

The master port can be configured as a DTE or DCE port by an

internal switch setting. If the master port is configured as a DTE port,

the four slave ports will become DCE ports. The 232SS2 supports

the following signals: TD, RD, RTS, CTS, DSR, DCD, and DTR.

The 232SS2 has an enhanced mode which offers special timer

features. The timer features can be used to prevent slave devices

from receiving preamble commands, inadvertently switching from

binary/graphic file transfers, and inactive slave devices from holding

control of the master port.

The 232SS2 will work with baud rates from 1200 to 115,200

bps; 7 or 8 data bits; even, odd or no parity; and 1 or 2 stop bits

(7,N,1 is not allowed).

NOTE: The data format and rates mentioned are used to switch

the 232SS2. The communication between the devices can use any

format or data rate.

There are four LED's on the 232SS2 to indicate which port is

connected to the master port. The master port has a DB-25S female

connector and the slave ports have DB-25S female connectors. The

232SS2 requires 12Vdc at 100ma. which is provided through a

2.5mm power jack.

232SS21600 Manual

B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

Checklist

Examine the shipping carton and contents for physical damage.

If damage is found, file a claim with the shipper immediately.

The following equipment should be in the shipping carton:

1. RS-232 Smart Switch

2. Instruction Manual

3. (2) 3.5" floppy disks

If any of the items above are not in the shipping carton contact

the shipper immediately.

232SS21600Manual 3

B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

Chapter 2: SETUP

The 232SS2 is set up using an eight-position dipswitch. This

dipswitch is used to set the communication format, port

configuration, smart switch/port combiner mode and to

enable/disable the enhanced features. To change the settings on

the switch, remove the power from the unit, and remove the screws

(2) from the bottom of the 232SS2. The dipswitch is located on the

top of the PC board (side with LEDs) and is labeled “SW1.” The

other dipswitch, labeled “SW2” is used to set the second character

of the preamble. After the switches have been set to match your

requirements, you can put the unit back together. Table 1 shows the

settings for dipswitch “SW1”.

* = FACTORY DEFAULT

Table 1. Communication & Port Setup

Dipswitch SW1

1 2 3 4 5 6 7 8 Setting

000XXXXX1200 Baud

100XXXXX2400 Baud

010XXXXX4800 Baud

110XXXXX9600 Baud *

001XXXXX19.2KBaud

101XXXXX38.4KBaud

011XXXXX57.6KBaud

111XXXXX115.2K Baud

XXX0XXXXEnhanced Disabled *

XXX1XXXXEnhanced Enable

XXXX0XXX8DataBits*

XXXX1XXX7DataBits

XXXXX0XXParityDisabled*

XXXXX1XXParityEnabled

XXXXXX0XSmartSwitchMode*

XXXXXX1XPortCombinerMode

XXXXXXX0DCEmasterport*

XXXXXXX1DTEmasterport

0 = OFF 1 = ON X = DON'T CARE

232SS21600 Manual

B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

Port Configuration

In order to determine the proper port configuration of the

232SS2, 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 will transmit data out on

pin 2 (on a DB-25) and a DCE device will receive data in on pin 2

(on a DB-25). IBM PCs and serial printers are DTE devices,

modems are DCE devices.

If an IBM PC (DTE device) is going to be connected to the

232SS2 master port, the master port should be configured as a DCE

port. If a modem (DCE device) is going to be connected to the

master port, it should be configured as a DTE port.

The master port can be configured as a DCE port (data received

on pin 2) or a DTE port (data received on pin 3) by setting dipswitch

“SW1”, position 8. To configure the master port as a DCE port, move

dipswitch “SW1”, position 8, to the "OFF" position. When the master

port is configured as a DCE port, ports A, B, C, & D will become

DTE ports (Refer to Table 2). To configure the master port as a DTE

port move dipswitch “SW1”, position 8, to the "ON" position. When

the master port is configured as a DTE port, ports A, B, C, & D will

become DCE ports (Refer to Table 3). Always power down the

smart switch when changing switch settings.

232SS21600Manual 5

B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

The 232SS2 supports the following RS-232 signals: TD, RD, SG,

RTS, CTS, DSR, DCD, and DTR.

The Smart Switch selects port A as the default port at power up.

Serial Data Configuration

In order for the host device that is connected to the master port

to select any of the four ports, the Smart Switch must be set to

match the host's communication format. Dipswitch “SW1”is used to

select the communication format of the Smart Switch. Switch

positions 1 through 3 select the baud rate. Switch position 5 selects

7 or 8 data bits. Switch position 6 determines if parity is enabled or

disabled.

NOTE: A data format of 7 data bits, no parity and one stop is

not allowed.

Table 2. DCE MASTER PORT CHART

Master Port

(DCE) Signal A,B,C & D Ports

(DTE)

Pin# Direction Description Pin# Direction

2 Input Transmit Data (TD) 2 Output

3 Output Receive Data (RD) 3 Input

4 Input Request to Send (RTS) 4 Output

5 Output Clear to Send (CTS) 5 Input

6 Input DCE Ready (DSR) 6 Output

7 GROUND Signal Ground (SG) 7 GROUND

8 Output Recv. Line Detect (DCD) 8 Input

20 Input DTE Ready (DTR) 20 Output

Table 3. DTE MASTER PORT CHART

Master Port

(DTE) Signal A,B,C & D Ports

(DCE)

Pin# Direction Description Pin# Direction

2 Output Transmit Data (TD) 2 Input

3 Input Receive Data (RD) 3 Output

4 Output Request to Send (RTS) 4 Input

5 Input Clear to Send (CTS) 5 Output

6 Output DCE Ready (DSR) 6 Input

7 GROUND Signal Ground (SG) 7 GROUND

8 Input Recv. Line Detect (DCD) 8 Output

20 Output DTE Ready (DTR) 20 Input

232SS21600 Manual

B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

Switch position 8 selects the port configuration, see section titled

"Port Configuration". Refer to Table 1. Always power down the smart

switch when changing switch settings.

Smart Switch Operation

Smart Switch mode is selected when dipswitch “SW1”position 7

is “Off.”In Smart Switch mode, the 232SS2 is constantly looking for

the three character preamble code by monitoring the data that is

being received on the master port from the host device. The 232SS2

requires a three character preamble code to turn on and off a port.

The first character must be the ASCII escape character (decimal

27). The second character is user programmable by setting

dipswitch “SW2”. “SW2”comes from the factory programmed to the

ASCII character STX (decimal 2). The third character should be the

ASCII upper case letters "A", "B", "C" or "D" (decimal 65, 66, 67, or

68 respectively) to select those ports. To turn off the selected port

the third character should be the ASCII EOT character (decimal 4).

For instance, to turn on port B you would send:

ESC STX B

If you were writing a program in BASIC to control the Smart

Switch you would form a string like this:

SWB$ = CHR$(27) + CHR$(2) + "B"

You could then send SWB$ to select port B. Similar strings

could be used for turning on the other ports. To turn off the ports the

string might look like this:

TOFF$ = CHR$(27) + CHR$(2) + CHR$(4)

When you are done with a port you can either select a new one

directly or turn off the selected port and then turn on the next one.

We recommend that you turn off the selected port before selecting

the next one. The turn off command consists of three characters that

are non-printing (ESC STX EOT). If port A is selected and you send

the command to select port B, all three characters (ESC STX B) will

pass through the A port since it is still selected and the letter B will

show up on your port A device. For information on preventing

command codes from being received by slave devices, refer to the

Enhance Mode section.

NOTE: There is no delay through the Smart Switch and the

data is not buffered.

232SS21600Manual 7

B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

Programming the Second Character

The second character comes programmed as the ASCII STX

character (decimal 2). You can change this to any 8-bit character

you wish by reprogramming dipswitch “SW2”. “SW2”is an eight-

position switch with each position equal to a certain weight. Refer to

“Setup”for instructions on removing the cover to access “SW2”.

Table 4 shows the weight chart for “SW2”.

*Factory Default -- ASCII “STX”character

(decimal 2), SW2 position 2 is only one ON.

If you wish to use the letter "U" as the second character, which

has a decimal value of 85, you would turn on switches 1, 3, 5, and 7

(1 + 4 + 16 + 64 = 85). Caution should be used when selecting the

second character, so that by itself, or with the ESC character in front

of it, it is not a valid command to any of the devices on the port. For

instance, on some printers ESC @ is the reset command. If you

tried to use the @ symbol (decimal 64) for the second character you

could reset your printer every time the preamble code was sent.

Note also that if your communication configuration is set for 7 data

bits you cannot use the eighth bit of SW2. For a list of the ASCII

character codes and their decimal values refer to Appendix A.

Binary File Transfer

A simple method of using the Smart Switch to transfer binary

files without the concern of it accidentally disconnecting, is to set the

file transfer at a baud rate different from the baud rate of the Smart

Switch. When transferring files at a different baud rate, the Smart

Switch will stay connected from the last preamble code.

Table 4. Programmable Character Setting

Dipswitch SW2* WEIGHT

516

632

764

8 128

Tabla de contenidos

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