Black Box Programmable Security Guard, SD015A User Manual

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]

© Copyright 1998. Black Box Corporation. All rights reserved.

CUSTOMER

SUPPORT

INFORMATION

AUGUST 1995

SD015A

Programmable Security Guard

Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [e-mail]

PROGRAMMABLE
SECURITY GUARD

TXA RXA TXB RXB PWR

RESET

PROGRAMMABLE SECURITY GUARD

1

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

RADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is,
in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been
tested and found to comply with the limits for a Class A computing device in accordance with the specifications in
Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when
the equipment is operated in a commercial environment. Operation of this equipment in a residential area is likely to
cause interference, in which case the user at his own expense will be required to take whatever measures may be
necessary to correct the interference.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio
Interference Regulation of Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de
classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.

INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)

1. Todas las instrucciones de seguridad y operación
deberán ser leídas antes de que el aparato eléctrico
sea operado.

2. Las instrucciones de seguridad y operación deberán
ser guardadas para referencia futura.

3. Todas las advertencias en el aparato eléctrico y en
sus instrucciones de operación deben ser respetadas.

4. Todas las instrucciones de operación y uso deben ser
seguidas.

5. El aparato eléctrico no deberá ser usado cerca del
agua—por ejemplo, cerca de la tina de baño, lavabo,
sótano mojado o cerca de una alberca, etc..

6. El aparato eléctrico debe ser usado únicamente con
carritos o pedestales que sean recomendados por el
fabricante.

7. El aparato eléctrico debe ser montado a la pared o al
techo sólo como sea recomendado por el fabricante.

8. Servicio—El usuario no debe intentar dar servicio al
equipo eléctrico más allá a lo descrito en las
instrucciones de operación. Todo otro servicio
deberá ser referido a personal de servicio calificado.

9. El aparato eléctrico debe ser situado de tal manera
que su posición no interfiera su uso. La colocación
del aparato eléctrico sobre una cama, sofá, alfombra
o superficie similar puede bloquea la ventilación, no
se debe colocar en libreros o gabinetes que impidan
el flujo de aire por los orificios de ventilación.

10. El equipo eléctrico deber ser situado fuera del
alcance de fuentes de calor como radiadores,
registros de calor, estufas u otros aparatos
(incluyendo amplificadores) que producen calor.

11. El aparato eléctrico deberá ser connectado a
una fuente de poder sólo del tipo descrito en
el instructivo de operación, o como se indique
en el aparato.

12. Precaución debe ser tomada de tal manera que la
tierra fisica y la polarización del equipo no sea
eliminada.

13. Los cables de la fuente de poder deben ser guiados
de tal manera que no sean pisados ni pellizcados por
objetos colocados sobre o contra ellos, poniendo
particular atención a los contactos y receptáculos
donde salen del aparato.

14. El equipo eléctrico debe ser limpiado únicamente
de acuerdo a las recomendaciones del fabricante.

15. En caso de existir, una antena externa deberá ser
localizada lejos de las lineas de energia.

16. El cable de corriente deberá ser desconectado del
cuando el equipo no sea usado por un largo periodo
de tiempo.

17. Cuidado debe ser tomado de tal manera que
objectos liquidos no sean derramados sobre la
cubierta u orificios de ventilación.

18. Servicio por personal calificado deberá ser provisto
cuando:

A: El cable de poder o el contacto ha sido dañado;

u

B: Objectos han caído o líquido ha sido derramado

dentro del aparato; o

C: El aparato ha sido expuesto a la lluvia; o

D: El aparato parece no operar normalmente o

muestra un cambio en su desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido

dañada.

PROGRAMMABLE SECURITY GUARD

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Contents

Chapter Page

1. Specifications .................................................................................................................................. 4

2. Introduction.................................................................................................................................... 5

2.1 Main Security Barriers........................................................................................................... 5

2.2 Features .................................................................................................................................. 5

2.3 Front-Panel Indicators........................................................................................................... 6

2.4 Reset Button........................................................................................................................... 6

3. Installation....................................................................................................................................... 7

3.1 Setting Internal DIP Switches for Individual Port Configurations..................................... 7

3.2 Connecting Devices to the Ports...........................................................................................14

3.3 Setting Up Modem Options..................................................................................................14

4. Operation ........................................................................................................................................15

4.1 Security Mode ........................................................................................................................15

4.1.1 How to Enter Security Mode.......................................................................................15

4.1.2 How to Exit Security Mode .........................................................................................15

4.1.3 How the PSG Reenters Security Mode .......................................................................15

4.1.4 Password Validation.....................................................................................................15

4.1.5 Callback After Password Validation............................................................................15

4.1.6 Secondary Password Validation ..................................................................................16

4.1.7 Entering or Reentering Security Mode......................................................................16

4.2 Pass-Thru Mode .....................................................................................................................16

4.2.1 How to Enter Pass-Thru Mode....................................................................................16

4.2.2 How to Exit Pass-Thru Mode ......................................................................................16

4.3 Program Mode.......................................................................................................................16

4.3.1 How to Enter Program Mode .....................................................................................17

4.3.2 How to Exit Program Mode ........................................................................................17

4.3.3 Step-by-Step Procedure ...............................................................................................17

4.3.4 Program Mode Options ..............................................................................................22

4.3.5 Add, Delete, List, and Edit Menu Options.................................................................22

4.3.6 Setting the Clock .........................................................................................................22

4.3.7 List-All Menu Option...................................................................................................22

4.4 RS-232 Control Leads Supported .........................................................................................24

4.5 Modem Control Procedures and Timing Requirements....................................................24

4.5.1 Answering an Incoming Call.......................................................................................24

4.5.2 Disconnecting at a Remote Modem ...........................................................................24

4.5.3 Disconnecting a Call from the Local Modem............................................................24

4.5.4 Making a Callback .......................................................................................................25

4.5.5 Ignoring an Incoming Call During a Callback Sequence.........................................25

4.6 Lead Operation If a Port is Configured for Modem Control.............................................25

4.6.1 Outputs.........................................................................................................................26

4.6.2 Inputs............................................................................................................................27

4.7 Sample Modem Configuration .............................................................................................27

PROGRAMMABLE SECURITY GUARD

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Contents (continued)

Chapter Page

4.8 Security Considerations................................................................................................................29

Figures

3-1. Internal Switch Locations for the PSG ....................................................................................... 7

4-1. The Program Mode Menu...........................................................................................................17

4-2. The LIST-ALL Option of the Main Programming Menu..........................................................23

Tables

3-1. Switch S1 (Port A: Options) ....................................................................................................... 8

3-2. Switch S2 (Port B: Options) ....................................................................................................... 9

3-3. Switch S3 (Port A: Baud Rate) ...................................................................................................10

3-4. Switch S4 (Port B: Baud Rate) ...................................................................................................11

3-5. Switch S5 (System Options) ........................................................................................................12

3-6. Switch S7 (Lead Options) ...........................................................................................................13

3-7. Jumper Settings............................................................................................................................14

4-1. RS-232 Control Leads Supported ...............................................................................................24

4-2. Output Leads with Modem Controls Enabled...........................................................................26

4-3. Input Leads with Modem Controls Enabled..............................................................................27

PROGRAMMABLE SECURITY GUARD

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Pins Supported — 1-8, 20, and 22

Data Rates — 45.5 to 38,400 bps (each port

individually selectable)

Memory — 1K buffer

Indicators — RXD and TXD for each port; Power

Enclosure — High-impact plastic

Interface — Asynchronous RS-232-C/V.24

Connectors — (2) DB9S 9-pin sub-D female

Power — Wallmount transformer

Size — 1.8”H x 5.5”W x 8.5”D

(4.6 x 14.0 x 21.6 cm)

Weight — 2 lb. (0.9 kg)

1. Specifications

CHAPTER 2: Introduction

5

The Programmable Security Guard (PSG) adds
security to any RS-232 asynchronous port, to help
protect your computer resources from unauthorized
accesses. The PSG is an in-line buffer box with three
modes of operation:

• Security Mode

• Pass-Thru Mode

• Program Mode

After a reset, the unit is in “Security Mode.” While
in Security Mode the unit acts as an open switch,
and will not pass any data until certain security
barriers are broken. Once valid users successfully
pass through the security barriers, the unit will
change its mode to “Pass-Thru.” In Pass-Thru Mode
the unit buffers data received from each port and
retransmits this data out the other port, using the
configured word structure, data rate, and flow
control of that port. Program Mode is used to enter
and update passwords and other parameters for the
security barriers.

2.1 Main Security Barriers

• Primary password validation

• User’s location validation (“callback”)

• Secondary password validation

2.2 Features

• Configurable by the user via software
(program mode) and DIP-switch selection.

• 1K of memory available for buffering.

• Each port can be individually configured, via
DIP switches, for word structure (7 or 8 data
bits, even/odd/no parity), data rate (45.5 to

38.4 Kbps), and flow control (X-ON/X-OFF
or DTR/CTS).

• Battery-backed-up memory saves all programmed
information automatically in case the power fails.

• Program mode for entering primary passwords
and their associated parameters.

• Primary passwords can be assigned to either or
both ports of the PSG, for security protection in
any direction.

• DIP-switch-selectable password retry count
(1, 2, 3, or infinite).

• DIP-switch-selectable maximum time period for
entering primary and secondary passwords (10
seconds, 30 seconds, 1 minute, 2 minutes).

• Internal memory storage of up to 64 different
primary passwords, associated response strings,
and secondary passwords.

• User-programmed primary and secondary
passwords: up to 32 characters long.

• Optional status messages like:

“invalid password”

“primary password accepted, unit now in pass-

thru mode”

“primary password accepted, prepare for user

location validation”

“primary password accepted, enter secondary

password”

“secondary password accepted, unit now in

pass-thru mode”

NOTE: These messages can be disabled via DIP

switch on an individual-port basis for
additional security.

• Optional response string programmable for
every primary password defined by the user.
User-programmed response strings can be up
to 32 characters in length.

• Onboard clock so that the user can program
certain passwords as valid only during specific
times of the day (for example, night; evening).

2. Introduction

PROGRAMMABLE SECURITY GUARD

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2.3 Front-Panel Indicators

There are 5 LEDs on the unit’s right front panel.

• Power LED: Lights when power is present.

• RXDA: Flashes when Port A is receiving data.

• TXDA: Flashes when Port A is transmitting data.

• RXDB: Flashes when Port B is receiving data.

• TXDB: Flashes when Port B is transmitting data.

2.4 Reset Button

The location of the reset button is shown in Fig. 3-1.
Any time you make changes to the internal switch
settings, you must press the reset button to activate
the changes. While the PSG is resetting, it cannot
process data.

NOTE: Disconnecting power from the PSG will also

reset the unit.

CHAPTER 3: Installation

77

Installing the PSG involves the following steps:

1. Setting the internal DIP switches for individual
port configurations.

2. Connecting devices to the ports.

3. Supplying power.

3.1 Setting Internal DIP Switches for Individual
Port Configurations

Remove the unit’s cover to expose the PC board.

Figure 3-1 shows the internal switch locations.

IMPORTANT

The internal DIP switches on your PSG
may be labeled either OPEN and
CLOSED or ON and OFF. For all internal
DIP switches in the PSG, OPEN=OFF
and CLOSED=ON.

3. Installation

Figure 3-1. Internal Switch Locations for the PSG.

P1

POWER

RESET

BUTTON

RXB

TXB

RXA

TXA

DB9

CONNECTORS

W3

A B C

A
B
C

W2

ON

S7

OFF

S1 S2 S3 S4 S5

RAM
SIZE

C B A

W4

Table 3-1. SWITCH S1 (Port A: Options)

OPTION SWITCH POSITION SETTING

1 2 3 4 5 6 7 8

STOP BITS

1 OFF OFF

1.5 ON OFF
1 OFF ON
2 ON ON

PARITY

Odd OFF
Even ON

PARITY

Disable OFF
Enable ON

DATA BITS

8 OFF
7 ON

FLOW CONTROL

Hardware OFF
Software ON

MODEM CONTROL

Disable OFF
Enable ON

PROGRAM MODE

Disable OFF
Enable ON

PROGRAMMABLE SECURITY GUARD

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Tables 3-1 to 3-6 show the switch position settings.
Table 3-7 shows the jumper settings. Several options
can be configured for each port individually: Baud
Rate, Parity, Data Bits per Word, Flow Control, and
Modem Controls.