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This package contains:

•1 Bidirectional Serial/Parallel Converter (SXP-320A or SXP-325A)

•1 AC 9V 200mA Power Adapter

•1 User Manual

Read this guide thoroughly and follow the installation and operation

procedures carefully to prevent any damage to the hub and/or any of the

devices it connects to.

All brand names and trademarks are the registered property of their respective owners.

USER'S MANUAL

Table of Contents

Overview

Features

Installation

Default Conguration

DIP Switch Settings

Cabling

Operation

Appendix

Troubleshooting

Specications

RS-232C Interface Specication

Centronics Interface Specication

Centronics Interface Timing Chart

Preventing Radio & TV Interference

Overview

The SXP-320A / SXP-325A are interface converters that

allow Centronics and RS-232 devices to communicate

with each other (a computer with an RS-232 output to a

Centronics printer, for example).

Both units are bidirectional enabling you to convert from

serial to parallel or parallel to serial. The primary dierence

between them is that the SXP-325A is congured with 512

KB of memory allowing it to serve as a printer buer,

whereas the SXP-320A has no memory.

These two way converters provide a DB-25 RS-232C (DCE)

compatible connector, and a C-36 Centronics connector.

The serial baud rate is from 1200 to 115200 bps. (selectable

by DIP Switch). The parallel interface speed for the (non-

buered) SXP-320A is 11.52 KB/sec; for the (buered) SXP-

325A, it is 1.5 MB/sec.

The units support both hardware and software (XON/XOFF)

handshaking. Setup is extremely easy. All that is involved

is setting the DIP Switch and connecting the cables.

Front View

Rear View

Features

• DIP Switch Sets Data Direction

• Built In Buer for Ecient Operation (SXP-325A)

• Both Hardware and XON/XOFF Handshaking

• Easy Installation

• Compact Size

Installation

Switch Conguration Overview:

The SXP-320A/325A is congured by setting an eight

segment DIP Switch as follows:

An explanation of each DIP Switch setting is given below.

Note: 1. When the segment is set in the direction of the

arrow, it is ON.

2. In each table, the default setting is highlighted

Conversion Direction:

Cabling

Serial to Parallel:

When performing a Serial to Parallel interface conversion:

1. Plug the female end of a 25/9-pin to 25/9-pin

male/female serial cable into the PC's serial port

2. Plug the male end of the 25-pin to 25-pin male/female

serial cable into the SXP-320A/SXP-325A's serial

connector

3. Plug the female end of a C-36 to C-36 male/female

printer cable into the SXP-320A/SXP-325A's printer

connector

4. Plug the male end of the C-36 to C-36 male/female

printer cable into the printer.

If your serial cable is long enough, you can plug Note:

the SXP-320A/SXP-325A directly into the printer,

without the need for a printer cable.

5. Plug the Power Adapter into an AC source; plug the

Power Adapter cable into the SXP-320A/SXP-325A's

power jack.

Setting the Switches

Baud Rate:

The baud rate is set with DIP Switch segments 1 - 3, as

shown in the table, below

Handshake:

Data and Stop Bits:

Parity:

Parallel to Serial:

When performing a Parallel to Serial interface conversion:

1. Plug the male end of a 25-pin (male) to C-36 (female)

printer cable into the PC's parallel port

2. Plug the female end of the 25-pin to C-36 male/female

printer cable into the SXP-320A/SXP-325A's Centronics

connector

3. Plug the male end of a 25-pin to 25-pin male/female

serial cable into the SXP-320A/SXP-325A's serial

connector

4. Plug the female end of the 25-pin to 25-pin male/female

serial cable into the printer's serial port

5. Plug the Power Adapter into an AC source; plug the

Power Adapter cable into the SXP-320A/SXP-325A's

power jack.

Switch Purpose

1 

2 Baud rate setting

3

4Handshake setting

5Data and Stop Bits setting

6 

Parity setting

7

8Conversion Direction setting

DIP Switch Segment Baud Rate

 (bits per second)

1 23

ONON ON 1200

ONON OFF 2400

ONOFF ON 9600

ONOFF OFF14400

OFFON ON19200

OFFON OFF38400

OFFOFF ON57600

OFFOFF OFF 115200

DIP Switch Segment

Handshake

4

ONXON/XOFF

OFF Hardware

DIP Switch Segment

Data BitsStop Bits

5

ON 7 2

OFF 8 1

DIP Switch Segment

Parity

6 7

ON EitherParity Inhibit

OFF ONEven Parity

OFF OFFOdd Parity

DIP Switch Segment

Conversion Direction

8

ON Parallel to Serial

OFF Serial to Parallel

SXP-320A / SXP-325A

DCE

DB-25

2

3

4

5

6

20

7

Device Connector's Pin #

DCE DTE DCE DTE

DB-9 DB-9 DB-25 DB-25

2 3 3 2

3 2 2 3

8 7 5 4

7 8 4 5

4 6 20 6

6 4 6 20

5 5 7 7

Cables

a 25-pin/25-pin cable

or a 9-pin/25-pin cable

TxRx

Rx Tx

RTSCTS

CTSRTS

DSRDTR

DTRDSR

GND GND

Device's Pin #

DB-25 C-36

1 1

2-9 2-9

10 10

11 11

12 12

13 13

14 14

15 32

16 31

17 36

18-25 19-30

a 25-pin/36-pinCables

or a 36-pin/36-pin cable

STROBE

D0-D7

ACK

BUSY

PE

SLCT

AUTOFEED-XT

ERROR

INIT

SLCT-IN

GND

SXP-320A / SXP-325A

C-36

1

2-9

10

11

12

13

14

32

31

36

19-30

DIP-SW

PARALLEL PORT

POWER ON LED

AC 9V JACK

RESET KEY

SERIAL PORT

©Copyright 1999 ATEN® nternational Co., Ltd.I

Manual Part NO. PAPE -1145-100

Printed in Taiwan 06/1999

PC

9 or 25 Pin Female to 25 Pin Male Cable

36 Pin Female to 36 Pin Male Cable

SXP-320A / SXP-325A

SXP-320A / SXP-325A

25 Pin Male to 36 Pin Female

25 Pin Male to 25 Pin Male Cable

PC

CONVERTER

Serial Port Cabling

Parallel Port Cabling

Produktspecifikationer