Black Box PCW22A-R3, PCW22A-R4 User Manual

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CUSTOMER

SUPPORT

INFORMATION

AUGUST 1998

PCW22A-R3 PCW22C-R4

Protocol Converter

A/S-2G

PORT A PORT B

TXD RXD RTS CTS DTR DSR CDA CDB TXD RXD RTS CTS DTR DSR TXC RXC PWR

FCC STATEMENT

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 la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.

TRADEMARKS USED IN THIS MANUAL

Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

PROTOCOL CONVERTER A/S-2G

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.

TABLE OF CONTENTS

Table of Contents

1.0 Specifications .......................................................................................................................................5

2.0 Introduction.........................................................................................................................................6

3.0 Installation ...........................................................................................................................................7

3.1 Unpacking and Inspection ........................................................................................................7

3.2 Data Flow Control ......................................................................................................................7

3.2.1 SW3 ...............................................................................................................................7

3.2.2 SW2 ...............................................................................................................................8

3.2.3 Self-Diagnostics.............................................................................................................9

3.2.4 Reconfigure Switch Mode............................................................................................9

3.2.5 RS-232 Pass-through Options ....................................................................................10

3.2.6 Reset Options .............................................................................................................10

3.3 Preparing A/S-2G for Connection to an Asynchronous Device............................................10

3.3.1 Data Terminal Ready (DTR) Signal Options ...........................................................10

3.3.2 Clear to Send (CTS) Signal Options.........................................................................11

3.3.3 Baud Rate Options.....................................................................................................11

3.3.4 Modem or Direct-to-Terminal Connection ..............................................................11

3.3.5 Carrier Options ..........................................................................................................12

3.3.6 Cable Requirement ....................................................................................................12

3.4 Preparing the A/S-2G for Connection to a Synchronous Device .........................................12

3.4.1 Data Terminal Ready (DTR) Signal Options ...........................................................12

3.4.2 Clear to Send (CTS) Signal Options.........................................................................12

3.4.3 Baud Rate Options.....................................................................................................13

3.4.4 Modem or Direct-to-Terminal Connection ..............................................................13

3.4.5 External or Internal Clocking Option......................................................................13

3.4.6 Carrier Options ..........................................................................................................13

3.4.7 Cable Requirement ....................................................................................................13

3.4.8 Command Pass-Thru..................................................................................................14

4.0 Operation...........................................................................................................................................15

4.1 Asynchronous Device to Synchronous Device........................................................................15

4.1.1 Line Control ...............................................................................................................15

4.1.2 Asynchronous Input Data Format.............................................................................15

4.1.3 Data Conversion.........................................................................................................15

4.1.4 Record and Block Size ...............................................................................................15

4.1.5 Use of Carriage Return..............................................................................................16

4.1.6 Flow Control...............................................................................................................16

4.1.7 Presentation of Data from A/S-2G to Synchronous Device ....................................17

4.1.8 Verification of Data Reception..................................................................................17

4.1.9 Line Turnaround .......................................................................................................17

PROTOCOL CONVERTER A/S-2G

4.2 Synchronous Device to Asynchronous Device........................................................................22

4.2.1 Line Control ...............................................................................................................22

4.2.2 Synchronous Input Data Format...............................................................................22

4.2.3 Data Conversion.........................................................................................................22

4.2.4 Flow Control...............................................................................................................22

4.2.5 Verification of Data Reception..................................................................................22

4.2.6 Line Turnaround .......................................................................................................22

5.0 Conversions and Connections ..........................................................................................................27

5.1 Transparency Mode of Operation...........................................................................................27

5.2 Installing or Replacing PROMs ...............................................................................................27

5.3 RS-232 Cable Chart ..................................................................................................................27

5.4 Code Conversions.....................................................................................................................29

5.5 Printed Circuit Board Layout ..................................................................................................31

CHAPTER 1: Specifications

1.0 Specifications

Protocol — Asynchronous: TTY (ASCII)

Bisynchronous: 2770, 2780, 3741, and 3780 (EBCDIC)

Ports — A: Asynchronous

B: Synchronous/bisynchronous

Speed — Up to 19.2 Kbps (each port independent)

Interface — RS-232 (both ports)

Connectors — (2) DB25 (female)

Flow Control — Asynchronous: X-ON/X-OFF or DTR/CTS interface lead (in DTE only)

Synchronous/bisynchronous: standard BSC handshaking

Indicators — Unit Power: PWR Power (LED mounted on Port B side)

Each Port: TXD Transmit Data

RXD Receive Data RTS Ready to Send CTS Clear to Send DTR Data Terminal Ready

DSR Data Send Ready Port A only: CDA Carrier Detect Port B only: CDB Carrier Detect (LED mounted on Port A side)

TXC Transmit Clock

RXC Receive Clock

Approvals —CE

Power — 115 VAC, 50/60 Hz, 63 watts

(230 VAC model available upon request)

Size — 2.1"H x 11.5"W x 8.8"D (5.3 x 29.2 x 22.4 cm)

Weight — 3.5 lb. (1.6 kg)

PROTOCOL CONVERTER A/S-2G

2.0 Introduction

The Model A/S-2G provides compatibility between an asynchronous, ASCII coded device and a synchronous, EBCDIC coded device. It is desirable, prior to installation, to review the following checklist to ensure the appropriateness of all the devices in the system for the planned application.

Synchronous (Bisynchronous) Side -

Which Protocol is being used? (2770, 2780, 3741, or 3780)

If IBM

-- is the line to be used a Bisynchronous line? Do you have the BSC Communications package?

Is machine code EBCDIC?

Asynchronous Side

Is transmission code ASCII?

Will it operate in TTY format (start/stop, RS-232, 7 bit, and even-odd mark or space parity)?

The A/S-2G is equipped with two bidirectional RS-232C ports. These ports, labeled Port A and Port B, transfer data at up to 19.2 Kbps. Either or both ports may be connected directly to a terminal, CPU, or an appropriate modem. You configure each port’s operational parameters independently by setting DIP shunts, DIP switches, and jumpers (explained in Chapter 3.0).

Diagnostic LEDs are mounted on the front of the unit. These LEDs are labeled Port A and Port B. They are directly associated with the two ports and indicate the status of the A/S-2G at the port indicated.

The reset button on the back panel will cause the A/S-2G’s Z80A microprocessor to reinitialize (reset).

CHAPTER 3: Installation

3.0 Installation

3.1 UNPACKING AND INSPECTION

After unpacking the A/S-2G, inspect it for shipping damage. Should there be any noticeable damage, save the cartons and contact the carrier who delivered the box to place a freight damage claim.

To open the A/S-2G, take out the four screws from the bottom. Lift off the cover. With the cover removed, visually inspect for components that may have been loosened in shipment. Shipping damage is rare, but a quick inspection is always good practice.

Leave the cover off for installation.

3.2 DATA FLOW CONTROL

For the locations of the switches and jumpers, see Figure 5-2 on page 28.

3.2.1 SW3

Locate the set of 8 asynchronous switches labeled SW3 on the printed circuit board. (See Figure 5-2 on page 28.) These should be set as follows:

Switch #l ON = echo asynchronous characters — echoplex mode.

OFF = don’t echo asynchronous characters — normal mode.

Set this switch ON when the asynchronous device expects to receive an echo of its transmitted data.

NOTE

The A/S-2G always operates in half-duplex mode on the synchronous side, so this option applies only to the asynchronous device.

Switch #2 ON = echo “EOT” character.

OFF = don’t echo “EOT” character.

The last record received from the asynchronous device must be terminated with a “Control D” character. For this character to echo to the asynchronous device, switch #2 must be ON. This character is echoed only after the EOT sequence is sent to the synchronous device. Its echo appears as a CR LF, EOT.

NOTE

An EOT from the bisynchronous device will be displayed in the same way to the asynchronous device with this switch ON.

Switch #3 ON = do not include CR (carriage return) character in EBCDIC data.

OFF = include CR character in EBCDIC data

Each block sent by the asynchronous device (except the last one) must be terminated with a CR (carriage return) code. If this CR code will be included in the synchronous EBCDIC data as a new line, this switch must

be OFF.

NOTE

The 3741 protocol is limited to a block size of 128 characters (the block size is also the record size), thus a CR must be entered not later than each 128 characters.

PROTOCOL CONVERTER A/S-2G

Block size for the 2770/2780 is normally limited to 160, but block size is 400 if the 2770/2780 has the Multiple Record Transmission. Block size for the 3780 is 512.

Switch #4 ON = sends CR LF (Carriage Return, Line Feed) to asynchronous device immediately after

each logical end of block character (ETB, or ETX) is received from the synchronous side.

OFF = Normal operation

Switch #5 ON = Variable-length blocks. This switch causes the records sent by the asynchronous

device to be blocked and treated as variable length, i.e. no spaces are used to pad out the block.

OFF = All blocks are treated as fixed length, which would require blank spaces, if necessary,

to complete the block size. (In 2780 multi-record blocks, an IUS character is inserted after each 80 characters counted. The final record is the only one that may be less than the block size specified).

NOTE

It is possible that a block will have only one record if you enter a CR after each record (2780 mode).

Switch #6 ON = 3780 MODE

OFF = 2770/2780/3741 MODE

Switch #7 ON = When RAM reaches a nearly-full state, DTR (Pin 20) will be lowered. When RAM

space is available, DTR will be raised to permit transmission to resume. Port A must be configured as DTE (see Section 3.2.5). When CTS from the external asynchronous device is ON, the A/S-2G can send data. When the external device lowers CTS, the A/S-2G will not send data.

OFF = When RAM reaches a nearly-full state, an X-OFF (ASCII DC3, 13 Hex) will be issued

to the asynchronous device to prevent buffer overrun. When RAM space is available, X-ON (ASCII DCl, 11 Hex) will be sent to resume transmission. Put the CTS A jumper to the on position (see Section 3.2.3).

Switch #8 ON = 2 Stop Bits (asynchronous side only).

OFF = 1 Stop Bit (asynchronous side only).

3.2.2 SW2

Locate the switch labeled SW2 on the printed circuit board. (See Figure 5-2 on page 28.)

Switch #1 ON = Space compression on transmit (3780 Mode only).

OFF = Normal operation.

Switch #2 ON = Pass escape sequences through.

OFF = Convert escape sequences to CR LF or FF per Section 4.2.3 on page 20.

Switch #3 ON = No Asynchronous RTS except during bisynchronous receive (half-duplex on

asynchronous side).

OFF = Normal Operation (full-duplex).

CHAPTER 3: Installation

Switch #4 ON = Self-Diagnostics Mode.

OFF = Normal Operation.

Switch #5, #6—Block Size Specification.

OFF OFF 80 Characters

OFF ON 128 Characters

ON OFF 256 Characters

ON ON 512 Characters

NOTE

For 3741, set SW3, Switch #5: OFF (Fixed length)SW2, Switch #5: OFF, and Switch #6: OFF (128 character block)

Switch #7, #8—Asynchronous Parity Specification.

OFF OFF Space Parity (always 0)

OFF ON Mark Parity (always l)

ON OFF Odd Parity

ON ON Even Parity

NOTE

The A/S-2G only recognizes a 7-bit, 1 bit parity sequence. 8-bit data, no parity is the same as 7-bit, space parity. If you have 8-bit data, no parity, set SW2, Switches #7 and #8 to the OFF position.

3.2.3 SELF-DIAGNOSTICS

There are two ways to enter the self-diagnostic mode. The first method requires that you locate SW2, switch #4 and set it to the ON position. When you press the reset switch, the A/S-2G will display diagnostic information (see below) on a terminal or printer connected to Port A.

The second method requires a terminal connected to Port A. When you type an ampersand (“&”) and then a pound sign (“#”), the A/S-2G will enter the Self-Diagnostics/Reconfigure Switch Menu. Press the “l” key to enter the self-diagnostics mode and the A/S-2G will display diagnostic information on your terminal.

This is what the A/S-2G does in self-diagnostic mode:

Displays its software version Checks the ROM Checks the RAM Displays the state of SW3 Displays the state of SW2 Displays the state of SW1 Port A Displays the state of SW1 Port B

The information for SW3, SW2, and SW1 is listed in binary: 1=ON and 0=OFF.

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