B&B Electronics 232PE User Manual

Port Expander

Model 232PE

Document No. 232PE3095

This product

Designed and Manufactured

In Ottawa, Illinois

USA

of domestic and imported parts by

B&B Electronics Mfg. Co. Inc.

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

PH [phone] -- FAX [phone]

Internet:

http://www.bb-elec.com

[e-mail]

[e-mail]

 1993 B&B Electronics -- June 1993

232PE3095 Manual Cover Page

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

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TABLE OF CONTENTS

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

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

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

Port Expansion Bus............................................................. 2

Setting The Address ............................................................2

Connecting To The Bus....................................................... 4

Port Configuration...............................................................5

RS-232 Configuration.......................................................5

RS-422/485 Option ..........................................................6

RS-422 Mode................................................................7

RS-485 Mode................................................................8

Specifications.................................................................... 10

Appendix A: Cable Charts ...........................................A-1

Chart 1. IBM PC DB25 Connector to Master Port........... A-2

Chart 2. IBM PC DB9 Connector to Master Port.............A-2

Chart 3. Modem DB25 Connector to Master Port............A-3

Chart 4. DCE Device w/DB25 Connector to Ports A - D

(DTE)....................................................................A-3

Chart 5. IBM PC DB25 Connector to Ports A - D (DTE) .. A-4

Chart 6. IBM PC DB9 Connector to Ports A - D (DTE).... A-4

Chart 7. IBM PC DB25 Connector to Ports A - D (DTE) .. A-5

Chart 8. IBM PC DB9 Connector to Ports A - D(DTE)..... A-5

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

Configured as an RS-422 /485 Port.......................A-6

Chart 10. RS-422/485 2-Wire Device to Port (A - D)

Configured as an RS-422 /485 Port.......................A-6

232PE3095 Manual Table of Contents i

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ii Table of Contents 232PE3095 Manual

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Chapter 1: HARDWARE
Introduction

The Port Expander (232PE) adds four asynchronous serial data
ports to the Expandable Smart Switch (232XSS). Up to fifteen Port
Expanders can be connected to a single 232XSS via the Port
Expansion Bus. Refer to Figure 1. This expands the eight ports on
the 232XSS to a maximum of sixty-eight ports. RS-232 ports are
standard on the 232PE, RS-422/485 ports are optional. RS-232
ports are configured as DTE ports and support signals TD, RD,
RTS, CTS, DTR, and DSR or CD. Ports configured as RS-422/485
support only signals TD and RD.

There are five red indicator LED's on the front of the 232XSS.
Four LED's represent ports "A" through "D" and indicate the
selected port. The fifth LED is the "Power On" indicator. Refer to
Figure 7. There are five connectors located on the back of the
232PE, a twenty pin expansion bus connector, four DB-25P male
connectors for ports "A" through "D", and an eleven inch bus
expansion ribbon cable. Refer to Figure 8.

In order to select a port on a Port Expander, each expander is
assigned its own unique address. A four position DIP switch in the
Port Expander is used to set this address. An address field is part
of the port selection control string that is received by the master
port of the Expandable Smart Switch. Refer to the Expandable
Smart Switch manual for more details regarding port selection.
There is no delay through the Port Expander and the data is not
buffered.

Figure 1. Simplified Functional Diagram

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

232PE3095 Manual 1

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

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Checklist

The following equipment should be in the shipping carton:

1. Port Expander

2. Instruction Manual

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

Port Expansion Bus

The number of serial ports on the Expandable Smart
Switch can easily be expanded to a maximum of sixty-eight ports
by daisy chaining Port Expander units on the 232XSS's expansion
bus. A maximum of fifteen Port Expander units can be added to a
232XSS. Each Port Expander unit (232PE) adds four additional
serial ports. The Port Expansion Bus connects each port to the
electronic switch control circuit in the 232XSS.

Setting The Address

Port Expanders must be assigned their own unique address.
Located inside the 232PE is a four position DIP switch (SW1) which
sets the unit's address. Refer to Figure 2. Select an unused
address from "1" to "15" using Table 1.

CAUTION: Always power down the 232PE before removing its

cover.
Do not select an address that is used by another Port

Expander, data collisions can occur and data will be
lost!

2 232PE3095 Manual

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Figure 2. Printed Circuit Board Outline

* PC board for optional RS-422/485 port.

232PE3095 Manual 3

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