Black Box MiniStat-Four User manual

CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
MARCH 2004
MX865A-R2
MiniStat-Four
MAIN SUB CHAN TEST ERR SYN
MINI STAT 4
4 3 2 1

1
FCC AND IC RFI STATEMENTS
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 B 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 la classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par Industrie Canada.

2
MINISTAT-FOUR
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
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.

3
NOM STATEMENT
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.

4
MINISTAT-FOUR
TRADEMARKS USED IN THIS MANUAL
Any trademarks mentioned in this manual are acknowledged to be the property of the
trademark owners.
QUICK SETUP GUIDE
If you are familiar with the operation of the MiniStat-Four and only need
a quick reference to get the unit operational, refer to Appendix C.

5
CONTENTS
Contents
Chapter Page
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Site and Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Setting of Internal Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.1 INIT/NOR Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.2 Pin 21 ON/OFF Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.3 GND Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4 Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4.1 Sub-Channel Connections. . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4.2 Main (Composite) Channel Connection. . . . . . . . . . . . . . 15
3.4.3 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5 Power-On Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4. Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 Configuration Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Using the MiniStat-Four’s Configuration Program . . . . . . . . . . . . . 19
4.3 Preparation for Configuration Session . . . . . . . . . . . . . . . . . . . . . . . 20
4.4 Starting the Configuration Program . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5 Configuration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.1 Front-Panel Indicators and Connectors . . . . . . . . . . . . . . . . . . . . . . 47
5.2 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
5.2.1 Powering On the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
5.2.2 Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
5.2.3 Powering Off the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
5.3 What to Do in Case of Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5.3.1 Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5.3.2 Check MiniStat-Four Indications . . . . . . . . . . . . . . . . . . . . 50
5.3.3 Check Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6
MINISTAT-FOUR
Contents (continued)
Chapter Page
6. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.2 Description of Test Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.2.1 Local Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.2.2 Remote Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.2.3 Modem Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
6.3 Calling Black Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.4 Shipping and Packaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Appendix A: Interface Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
A.1 Main (Composite) Channel Interface. . . . . . . . . . . . . . . . . . . . . . . . 61
A.2 Sub-Channel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Appendix B: MiniStat-Four Configuration Record . . . . . . . . . . . . . . . . . . . . . . 66
Appendix C: Quick Setup Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
C.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
C.2 What You Need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
C.3 Configuration Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

7
CHAPTER 1: Specifications
1. Specifications
Compliance: FCC Part 15 Class A; IC Class/classe A
Protocols:
Subchannels: Asynchronous;
Composite: Synchronous with proprietary variant of HDLC
framing as defined in CCITT X.25 level 2
Clock Source: Composite: External
Data Format:
Subchannels: 5, 6, 7, or 8 data bits; 1, 1.5, or 2 stop bits; even, odd,
or no parity;
Composite: HDLC frames
Flow Control:
Subchannels:
Hardware: DTR/CTS, end-to-end (DTE-to-DTE);
Software: X-ON/X-OFF, either end-to-end (DTE-to-DTE) or
subchannel-to-DTE (user-selectable); users can choose any
extended-ASCII characters from 11 hex (DC1) to 14 hex (DC4)
or 91 hex to 94 hex to be the X-ON and X-OFF characters
Operation: Point-to-point
Data Rate:
Subchannels: 19,200, 14,400, 9600, 7200, 4800, 2400, 1200, 600, or
300 bps (user-selectable);
Composite: Up to 19,200 bps (depends on external clock rate)
Maximum Distance: 50 ft. (15.2 m) from the MiniStat-Four to any attached
device
User Controls:
(3) Internal jumpers: Normal/initialization, Pin 21 enable/disable,
and grounds connect/disconnect;
Menu-driven configuration program accessible from a PC or
terminal attached to any subchannel port; configuration can be
downloaded across the composite line from either MiniStat-Four
to the other
Diagnostics: Local and remote subchannel and composite loopback
tests; when the composite line passes through a modem pair,
local analog and remote digital loopback tests

8
MINISTAT-FOUR
Control Signals Supported:
Subchannel: RTS, CTS, DSR, RLSD (DCD), DTR;
Composite: RTS, CTS, RLSD (DCD), DTR, analog loopback
(pin 18), remote digital loopback or signal quality (user-selectable,
pin 21)
Interface: TIA RS-232 (ITU-TSS V.24):
Subchannels: DCE;
Composite: DTE
Connectors:
(5) Top-mounted DB25 female: (4) subchannel, (1) composite;
(1) Side-mounted miniature jack for power
Indicators: (8) Rear-mounted LEDs: SYNC (power/synchronization), ERR
(error), TEST, (4) subchannel activity; composite activity
Temperature Tolerance: 32 to 122°F (0 to 50°C)
Humidity Tolerance: Up to 95%, non-condensing
Power: External power supply:
Input: 120 VAC at 60 Hz;
Output: 9 to 12 VDC, 300 mA, tip positive/ring (sleeve) negative
Size: 1.2"H x 4"W x 7.3"D (3 x 10.2 x 18.5 cm)
Weight: 12 oz. (340 g)

9
CHAPTER 2: Introduction
2. Introduction
2.1 Functional Description
The MiniStat-Four is an advanced, full-function miniature statistical multiplexor.
It multiplexes four asynchronous data sub-channels at data rates of 300 to
19,200 bps onto a single composite synchronous channel. An external clock signal
automatically determines the composite channel rate, but you select sub-channel
characteristics and other system features using a menu-driven configuration
function.
The mux uses dynamic data-buffer management to allocate available buffer
capacity according to sub-channel activity. Powerful and efficient error detection
and automatic retransmission, which are completely transparent to the user,
ensure error-free end-to-end data transmission.
Independent hardware and software flow control are used for each sub-channel
(both end-to-end flow control [DTE to DTE] and terminal flow control [DCE to
DTE]). For compatibility with most applications, choose from several software
flow-control characters.
From any sub-channel port, the mux provides for full system configuration
(including configuration downloading from the local MiniStat-Four to the remote
MiniStat-Four, and vice-versa). Password protection prevents unauthorized
configuration changes.
Configure the mux from any standard PC or CRT terminal, using a simple, menu-
driven facility. Nonvolatile memory contains configuration parameters, which are
immediately available upon power-up.
To make initial system configuration easier, the MiniStat-Four stores—in addition
to the user-selected configuration—a set of default configuration parameters
(factory settings) that you can select via a jumper.
The mux gives you comprehensive diagnostics functions, including automatic
self-test upon power-on, local and remote sub-channel loopback, and local and
remote composite-channel loopback. LED indicators show the condition of each
sub-channel and composite-link synchronization status. In addition, the MiniStat-
Four can control the V.54 pins (pins 18 and 21) of the RS-232 interface serving the
composite link, thereby allowing control of analog- and remote digital-loopback
functions of the modem connected to the mux.

10
MINISTAT-FOUR
2.2 Typical Applications
Figure 2-1 shows a typical application. The MiniStat-Four concentrates data coming
into its sub-channels at various rates from a host computer. It then statistically
multiplexes sub-channel data to form a composite data stream with a rate much
smaller than the arithmetical sum of the individual sub-channel rates.
Figure 2-1. Typical MiniStat-Four application.
The required composite link rate depends on MiniStat-Four buffer capacity versus
sub-channel traffic statistics and allowable delay. The composite data is sent
through modems to the remote MiniStat-Four, where it is demultiplexed and
distributed to the local users at their nominal rate (which may differ from the
nominal transmission rate).
NOTE
Reliable operation of any statistical multiplexor requires the equipment
connected to its sub-channels to use some form of flow control.
However, the flow-control method used at each of the two sub-channel
ends can differ (hardware control at one end, software control at the
other end), and the conversion is transparently performed by the
MiniStat-Four.
KEY
19.2 = 19.2 kbps
9.6 = 9.6 kbps
4.8 = 4.8 kbps
2.4 = 2.4 kbps
1.2 = 1.2 kbps
D = DTR flow control
X = X-ON/X-OFF flow control
19.2 X
19.2 X
1.2 D
2.4 X
19.2 X
19.2 D
9.6 D
4.8 X MiniStat-
Four
MiniStat-
Four
Modem Modem
Terminal
Modem
Modem Terminal
Printers

11
3. Installation
3.1 General
The MiniStat-Four is delivered completely assembled. It’s designed for installation
on a desktop. Mechanical and electrical installation procedures for the MiniStat-
Four are provided in the following sections.
After installing the mux, refer to Chapter 4 for system-configuration information
and procedures (including sub-channel bit rate, data format, and flow-control-
mode selection).
If you encounter a problem, refer to Chapter 6 for test and diagnostic instructions.
3.2 Site and Power Requirements
The MiniStat-Four is powered by an external power supply of 9 to 12 V/250 mA.
Use a miniature wallmount power supply to provide the required power. The
power supply connects to the mux by a cable ending in a miniature phone jack
(tip positive, sleeve ground). The MiniStat-Four does not contain fuses, so the
power supply must include a fuse of the appropriate rating.
The mux operates properly in any ambient conditions suitable for operation of
electronic computer equipment and peripherals. It operates without performance
degradation over a wide range of temperatures (32 to 122°F [0 to 50°C]) at relative
humidities up to 95%, noncondensing.
3.3 Setting the Internal Jumpers
The MiniStat-Four has three internal jumpers. Refer to Figure 3-1 and to the
following descriptions.
3.3.1 INIT/NOR J UMPER
This jumper selects which default set of configuration parameters the MiniStat-
Four loads at power-up. The jumper has two positions:
• NOR (normal operation, the factory-default setting) — The MiniStat-Four
loads the user-selected parameters most recently saved in nonvolatile RAM.
• INIT (initialization) — The MiniStat-Four loads its factory-default
configuration (permanently set at the factory and common to all MiniStat-
Four units).
CHAPTER 3: Installation

12
MINISTAT-FOUR
When you receive your MiniStat-Four, its “normal” configuration will be the same
as the factory-default configuration.
You might have to select the factory-default configuration (INIT) in the future if
either of the following situations occurs:
• An error is made during the configuration session, which either prevents
communication between the control terminal and the MiniStat-Four or
proves difficult to trace and correct.
• The description of the configuration loaded into the MiniStat-Four (including
any passwords) is lost, and it is therefore not possible to enter the configur-
ation mode in the NOR mode. To avoid this inconvenience, always keep a
record of the last configuration parameters (a typical record form is shown
in Appendix B).
After the default configuration loads, it becomes the current MiniStat-Four
configuration; return the jumper to the NOR position so that, once you change
the configuration back to what it’s supposed to be and save it in NVRAM, the
MiniStat-Four will load it at its next power-up.
3.3.2 PIN 21 ON/OFF J UMPER
Pin 21 of the standard RS-232 interface can serve either as a signal-quality-
indication (SQ) line, or as a remote-loopback-command line. The actual function
depends on the specific model of modem in use, and a jumper adapts
the MiniStat-Four to the modem connected to the composite link connector.
The jumper has two positions:
• PIN 21 ON — Set the jumper to this position when the modem uses pin 21 as
a remote-loopback-command line. This connects the internal MiniStat-Four
pin 21 driver to this pin, and lets you control this modem function using the
diagnostics screen.
• PIN 21 OFF (the factory-default setting) — Set the jumper to this position
when the modem uses pin 21 as a signal-quality-indication output. Use this
position whenever you are in doubt about the actual function of the pin in the
modem you use. In this position, you no longer have control of the modem’s
remote-loopback function from the diagnostics screen.

13
3.3.3 GND J UMPER
This jumper controls the connection between the signal-ground lines (pin 7 in all
MiniStat-Four RS-232 connectors) to the chassis-ground lines (pin 1). The
installation manager determines the appropriate position.
The jumper has two positions:
• C (connect) — Pins 1 and 7 connected
• D (disconnect, the factory-default setting) — Pins 1 and 7 not connected
Jumper-Setting Procedure
WARNING
Only qualified service personnel should access the inside of the
MiniStat-Four.
Avoid electric shock! Always disconnect the power cable from the utility
(mains) outlet before opening the MiniStat-Four.
To set the jumpers:
1. Disconnect all cables connected to the MiniStat-Four, including the power
cable.
2. Find the four screws (located on the bottom of the mux) that secure the
MiniStat-Four’s cover. Unscrew them, then remove the cover.
3. Refer to Figure 3-1 on the next page and identify the jumper locations and
settings. Change the settings of your mux’s jumpers as required.
4. Reinstall the MiniStat-Four’s cover and refasten the screws. (Do not
overtighten these screws.)
CHAPTER 3: Installation

14
MINISTAT-FOUR
Figure 3-1. Identification of internal jumpers.
3.4 Cable Connections
The MiniStat-Four has five top-mounted standard DB25 connectors. Main-channel
and sub-channel cables connect directly to these connectors.
3.4.1 S UB -C HANNEL C ONNECTIONS
MiniStat-Four sub-channel interfaces are configured as data communication
equipment (DCE) interfaces, so they connect directly to data terminal equipment
(DTE) via RS-232 port cables. When modems extend range (as in tail-end circuits),
crossover cables are required. Sub-channel interfaces are asynchronous, so clock
signals are not required or supported.
ON OFF
PIN 21
GND
CONNECT DISCONNECT
INIT
INIT NOR
NOR
CD
SUB-2
SUB-1
POWER
JACK
J-1
SUB-3
SUB-4

15
CHAPTER 3: Installation
Appendix A lists the pinouts of the MiniStat-Four’s sub-channel connectors and
provides typical wiring diagrams for straight-through and crossover cables with
DB25 connectors.
3.4.2 M AIN (C
OMPOSITE ) C HANNEL C ONNECTION
The MiniStat-Four’s composite-channel interface is configured as a DTE interface;
it connects to a synchronous modem that provides the clock signal to determine
the MiniStat-Four’s composite-channel data rate. Appendix A lists the pinout of the
MiniStat-Four’s composite-channel connector.
3.4.3 P OWER
C ONNECTION
Power connects to a miniature jack (tip: positive; sleeve: negative and ground).
3.5 Power-On Procedure
To power the MiniStat-Four on, connect the power cable to its power jack, then
plug the power supply into the AC wall outlet. The SYNC indicator should light. If
the link to the remote MiniStat-Four is still not operational, the SYNC indicator will
flash.
Check that after a few seconds (during which the MiniStat-Four performs
a self-test), the ERR indicator goes out.
For additional information on MiniStat-Four indications, refer to Chapter 5.

16
MINISTAT-FOUR
4. Configuration
The MiniStat-Four operates in any of three modes:
1. Normal operation mode.
2. Parameter-configuration mode. Allows you to set parameters of local and
remote MiniStat-Four units. This mode provides two types of functions:
• Parameter-selection functions.
• System-management functions, used to save (store) selected parameters,
transfer configurations between the local and remote units, activate new
configurations, and select passwords.
3. Diagnostics mode. MiniStat-Four diagnostic functions include local and
remote loops on each sub-channel and on the composite channel, and
modem loops (analog and optional remote digital loopback). Refer to
Chapter 5 for additional details.
The parameter-configuration mode and the diagnostics mode are activated by you
from the command terminal, using the MiniStat-Four’s configuration program. If
you’re already acquainted with the MiniStat-Four, see the Quick Setup Guide in
Appendix C.
This chapter provides an outline of the configuration parameters. Section 4.4
provides step-by-step instructions for starting configuration and diagnostics
sessions. Section 4.5 provides in-depth information on each menu, and the
purpose of each parameter or diagnostics screen.
You determine the MiniStat-Four’s operation mode, using the mux’s configuration
program. Section 4.1 provides concise configuration information, and Sections 4.2
through 4.5 provide detailed step-by-step configuration instructions.
4.1 Configuration Information
The MiniStat-Four has two types of configuration parameters:
1. System parameters that affect both MiniStat-Four units connected in a link
and also affect all their sub-channels. System parameters are listed in
Table 4-1.

17
CHAPTER 4: Configuration
2. Sub-channel parameters that affect only the operation of a single
sub-channel. Sub-channel parameters are listed in Table 4-2.
Set these parameters with the MiniStat-Four’s configuration program. Sections 4.2
through 4.5 tell you how to use this program; the organization tree for the
program is shown in Figure 4-1.
Table 4-1. MiniStat-Four system parameters and factory settings.
No. Parameter Function Available Factory
Selections Setting
1 PASSWORD Controls access Any two RD
to configuration characters (capital
as X-ON and except those letters)
X-OFF used as X-ON
and X-OFF
control
characters
2 X-ON When using 11H (DC1) 11H
CONTROL software flow 12H (DC2)
CHARACTER control, causes 13H (DC3)
the receiving 14H (DC4)
terminal to 91H
start data 92H
transfer 93H
94H
3 X-OFF When using Same range 13H
CONTROL software flow as for X-ON;
CHARACTER control, causes however,
the receiving the selected
terminal to stop character
transfer of data must be
different from
the X-ON
character

18
MINISTAT-FOUR
Table 4-2. Sub-channel parameters and factory settings.
No. Parameter Function Available Factory
Selections Setting
1 BAUD RATE Sub-channel 300, 600, 9600
data rate 1200, 1800,
2400, 4800,
7200, 9600,
14400, and
19200 bps
2 DATA BITS Number of data 5, 6, 7, 8 8
in sub-channel
data frame
3 PARITY Type of parity Odd None
used in sub- Even
channel data frame None
4 STOP BITS Number of stop 1, 1.5, 2 1
bits in sub-channel
data frame
5 MINISTAT-FOUR Controls software On On
TO DTE SOFT- flow control function Off
WARE FLOW at the local end of
CONTROL the sub-channel.
When on, see also
Table 4-1, Nos. 2
and 3.

19
CHAPTER 4: Configuration
Table 4-2 (continued). Sub-channel parameters and factory settings.
No. Parameter Function Available Factory
Selections Setting
6 END-TO-END Activates end-to- On Off
SOFTWARE end software flow Off
FLOW CONTROL control. When on,
see also Table 4-1,
Nos. 2 and 3.
7 END-TO-END Activates end-to On On
DTR FLOW end hardware Off
CONTROL flow control (via
DTR line)
4.2 Using the MiniStat-Four’s Configuration Program
Use the MiniStat-Four’s configuration program to configure the MiniStat-Four for
operation in your particular system.
The configuration program runs from any standard PC (in terminal-emulator
mode) or CRT terminal connected to any sub-channel port. It’s a simple menu-
driven program that guides you through the various configuration steps. At each
step, a screen that shows all available selections appears, and when applicable, also
shows the current selections. Use a standard selection procedure throughout: the
available options are marked with numbers; indicate your selection by typing the
option number. To leave the current screen, type Qto return to the previous
screen, except at the main menu, where you must type 6to exit the program.
The program checks your entries and does not accept invalid entries. For example,
if the program expects a numerical entry in a certain range, but you press a key
outside this range, the program ignores your entry and waits for a valid response.
After you provide a valid response, the local MiniStat-Four immediately executes it.
(As you will see later, when you prepare the configuration for the remote MiniStat-
Four, three different stages are used: preparing configuration, transfering to
remote MiniStat-Four, and activating transferred configuration.)