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 724-746-0746
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
CUSTOMER
SUPPORT
INFORMATION
AUGUST 1998
PCW22A-R3
PCW22C-R4
Protocol Converter
A/S-2G
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
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 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
2
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
3
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
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
5
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
6
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
7
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
8
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
9
Switch #4 ON = Self-Diagnostics Mode.
OFF = Normal Operation.
Switch #5, #6—Block Size Specification.
56
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.
78
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.
PROTOCOL CONVERTER A/S-2G
10
NOTE
Self-diagnostics will normally display the switches as they are set on the printed circuit board. If the switches
were reconfigured (see Section 3.2.4), the switches will be displayed as they are set in the software.
3.2.4 RECONFIGURE SWITCH MODE
To enter the Reconfigure Switch Mode, a terminal must be 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 “2” key to enter the Reconfigure Switch Mode. The position of SW2, Switch
#4 (for self-diagnostic testing) does not affect this operation.
The setting for SW3-l (SW3, switch #1) will be displayed. To select the other option for SW3-l, press
“T” (must be upper case). As long as “T” is pressed, the A/S-2G will
“
toggle” between or among your
options. The option will be chosen when you press “enter.” The next switch will then be displayed.
After you have entered the last option, the A/S-2G will return to the main program.
NOTE: If power is interrupted, the A/S-2G will use the manual configurations of SW1, SW2, and SW3
when power is restored. The switch options chosen in the Reconfigure Switch Mode must be reentered.
3.2.5 RS-232 PASS-THROUGH OPTIONS
On the A/S-2G’s printed circuit board are three sets of double pass-through jumpers: DSR, DTR,
and CD. You can have any, or all, of these signals pass-thru from one port to the other without being
regulated by the A/S-2G.
The DSR double jumper is located just below C7 on the circuit board. For normal operation
(A/S-2G signal control), place the jumper over the center and left posts. For pass-through, position
the jumper over the center and right posts.
The DTR double jumper is located just below and slightly to the right of U28 on the circuit board.
For normal operation (A/S-2G signal control), place the jumper over the center and left posts.
For pass-through, position the jumper over the center and right posts.
The CD double jumper is located between U20 and U24 on the circuit board. For normal operation
(A/S-2G signal control), place the jumper over the center and upper posts. For pass-through, position
the jumper over the center and lower posts.
3.2.6 RESET OPTIONS
You can configure the A/S-2G to reset automat-ically on the occurrence of Ring Indicate (RI) on either
port or the loss of Data Set Ready (DSR) on Port A and/or Port B. These jumpers are located on the
upper left of the circuit board, just below U7. Any, or all, of these jumpers may be selected. All of the
reset options are disabled as shipped from the factory—the jumper is over the center and right posts.
To enable one of these reset options, move the appropriate jumper over the left and center posts.
3.3 PREPARING THE A/S-2G FOR CONNECTION TO AN ASYNCHRONOUS DEVICE
The asynchronous port (Port A) is designed to connect to an asynchronous modem, terminal, or CPU.
Set the switches, shunts, and jumpers as described below, then plug a male RS-232 connector into the
A/S-2G’s female receptacle. Sex-change adapters, connectors, and cable are available if you need them.
3.3.1 DATA TERMINAL READY (DTR) SIGNAL OPTIONS
The asynchronous port DTR option control is a jumper labeled DTR A. It is located between U23
and U24 on the circuit board. (See Figure 5-2 on page 28.) Placing the jumper over ON maintains a
constant high signal on DTR. Placing this jumper to CNT allows the A/S-2G to control data flow based
on the position of SW3, Switch #7.
CHAPTER 3: Installation
11
If SW3, Switch #7 is ON, the A/S-2G will drop DTR when only 32 character spaces remain in the buffer.
The A/S-2G will reassert DTR as soon as there are at least 33 character spaces available. For most
applications, it is best to configure SW3, Switch #7 ON.
If SW3, Switch #7 is OFF, the A/S-2G does not use DTR to control the buffer. Instead, the A/S-2G
will issue either an X-ON or X-OFF to control data flow.
3.3.2 CLEAR TO SEND (CTS) SIGNAL OPTIONS
The asynchronous port CTS option control is a jumper labeled CTS A. It is located between U18 and
U22 on the circuit board. (See Figure 5-2 on page 28.) Placing the jumper over ON maintains a
constant high signal on CTS. Placing this jumper to CNT allows the A/S-2G to control data flow.
When CTS is dropped by the device connected to the A/S-2G’s asynchronous port, the A/S-2G will hold
whatever it has in its buffer and stop transmission until CTS is raised again. When the asynchronous
port is configured as DCE (see Section 3.3.4), it is best to have the CTS A jumper positioned over ON.
3.3.3 BAUD RATE OPTIONS
SW1, switches #1 through #4 (See Figure 5-2 on page 28) control the Port A Baud Rate. Set these four
switches so that the baud rate of the A/S-2G matches the baud rate of the modem, terminal, or CPU that
you will be connecting to the asynchronous port. Refer to Table 3-1, Port A (Asynchronous) Baud Rate,
to determine the position of each switch.
NOTE
The baud rate of the asynchronous port (Port A) cannot be set externally. Do not use the EXT setting for Port A.
3.3.4 MODEM OR DIRECT-TO-TERMINAL CONNECTION
When connecting the A/S-2G’s asynchronous port to a modem or external Asynchronous Modem
Eliminator, the A/S-2G should be made to appear as DTE (Data Terminal Equipment).
When connecting the A/S-2G’s asynchronous port directly to a terminal or CPU, the A/S-2G should
be made to appear as DCE (Data Communications Equipment).
To configure this interface correctly, place the DIP Shunt (which resembles a PROM) into the correct
socket. There are two DIP Shunts—one for the asynchronous port and one for the synchronous port.
Only one of these configurations—DTE or DCE— may be selected for each port at any given time. The DIP Shunt
for the asynchronous port (Port A) should go on U27 or U28. (Refer to the printed circuit board
layout, Figure 5-2, on page 28.) To remove or replace a DIP Shunt, follow the instructions for installing
and replacing PROMs, Section 5.2, on page 24.
Rate 1 2 3 4
EXT
(Invalid)
OFF OFF OFF OFF
75 OFF OFF OFF ON
110 OFF OFF ON OFF
134.5 OFF OFF ON ON
150 OFF ON OFF OFF
300 OFF ON OFF ON
600 OFF ON ON OFF
1200 OFF ON ON ON
Rate 1 2 3 4
1800 ON OFF OFF OFF
2000 ON OFF OFF ON
2400 ON OFF ON OFF
4800 ON ON OFF OFF
7200 ON ON OFF ON
9600 ON ON ON OFF
19200 ON ON ON ON
PORT A (Asynchronous) BAUD RATE
Table 3-1. Port A (Asynchronous) Baud Rates.
PROTOCOL CONVERTER A/S-2G
12
3.3.5 CARRIER OPTIONS
If the carrier detect signal is to be driven by the A/S-2G configuration (DCE), the jumper labeled CAR A
ENB must be installed. CAR A ENB is located below U20. Refer to the printed circuit board, Figure 5-2,
on page 28.
The carrier control jumper, CARR A, in between U18 and U19 on the circuit board (See Figure 5-2 on
page 28) should be set as follows:
(a) continuous carrier—place the jumper over the ON position.
(b) switched carrier equal to the RTS signal from the A/S-2G—place the jumper over the CNT position.
If the A/S-2G asynchronous port is configured as DCE, place a jumper over CAR A ENB and place the
CARR A jumper over ON.
3.3.6 CABLE REQUIREMENT
Use an RS-232 cable which is pinned straight through, i.e. 1 to 1, 2 to 2, 3 to 3, etc., to connect the A/S2G’s asynchronous port to the modem, terminal, or CPU. Leads 1 through 8 and 20 are required (see
Section 5.3 on page 25).
3.4 PREPARING THE A/S-2G FOR CONNECTION TO A SYNCHRONOUS DEVICE
The synchronous port (Port B) is designed to connect to a synchronous modem, modem eliminator, or
terminal. Set the switches, shunts, and jumpers as described below, then plug a male RS-232 connector
into the A/S-2G’s female receptacle. Sex-change adapters, connectors, and cable are available if you
need them.
3.4.1 DATA TERMINAL READY (DTR) SIGNAL OPTIONS
The synchronous port DTR option control is a jumper labeled DTR B. It is just under U26 on the
circuit board. (See Figure 5-2 on page 28.) Placing the jumper over ON maintains a constant high
signal on DTR. When this jumper is placed over CNT, the A/S-2G will drop DTR during a reset or
after receipt of a DLE EOT sequence from either the synchronous or the asynchronous port.
For most installations, position the jumper over ON.
3.4.2 CLEAR TO SEND (CTS) SIGNAL OPTIONS
The synchronous port CTS option control is a jumper labeled CTS B. It is located between U21 and
U25 on the circuit board. (See Figure 5-2 on page 28.) Placing the jumper over ON maintains a
constant high signal on CTS. When this jumper is placed over CNT, the A/S-2G will raise RTS when
Rate 5 6 7 8
EXT OFF OFF OFF OFF
75 OFF OFF OFF ON
110 OFF OFF ON OFF
134.5 OFF OFF ON ON
150 OFF ON OFF OFF
300 OFF ON OFF ON
600 OFF ON ON OFF
1200 OFF ON ON ON
Rate 5 6 7 8
1800 ON OFF OFF OFF
2000 ON OFF OFF ON
2400 ON OFF ON OFF
4800 ON ON OFF OFF
7200 ON ON OFF ON
9600 ON ON ON OFF
19200 ON ON ON ON
PORT B (Synchronous) BAUD RATE
Table 3-2. Port B (Synchronous) Baud Rates.
CHAPTER 3: Installation
13
there is data to be transmitted. Once the A/S-2G receives CTS from the attached device, it will transmit
the data. When the synchronous port (Port B) is configured as DTE, the CTS B jumper must be placed
over the CNT position. Place the CTS B jumper over the CNT position when Port B is configured as
DCE.
3.4.3 BAUD RATE OPTIONS
For externally provided synchronous clocking, the baud rate for the synchronous communication line
is determined by the modem or modem eliminator. To select External Clock on Port B, all switches for
Port B Baud Rate (SW1, Switches #5 through #8) must be in the OFF position.
When Transmit and Receive Clock are optioned for INTERNAL, set the four switches so that the baud
rate of the A/S-2G matches the baud rate of the external synchronous device. Refer to
Table 3-2, Port B (Synchronous) Baud Rates, to determine the position of each switch.
3.4.4 MODEM OR DIRECT-TO-TERMINAL CONNECTION
When connecting the A/S-2G’s synchronous port to a modem or external Synchronous Modem
Eliminator, the A/S-2G should be made to appear as DTE (Data Terminal Equipment).
When connecting the A/S-2G’s synchronous port directly to a terminal or CPU, the A/S-2G should
be made to appear as DCE (Data Communications Equipment).
To configure this interface correctly, place the DIP Shunt (which resembles a PROM) into the correct
socket. There are two DIP Shunts—one for the asynchronous port and one for the synchronous port.
Only one of these configurations—DTE or DCE— may be selected for each port at any given time. The DIP Shunt
for the synchronous port (Port B) should go on U29 or U30. Refer to the circuit board layout (Figure
5-2 on page 28). To remove or replace a DIP Shunt, follow the instructions for installing and replacing
PROMs, Section 5.2, on page 24.
3.4.5 EXTERNAL OR INTERNAL CLOCKING OPTION
The Receive and Transmit Clock options are controlled by two EXT B jumpers and two SME B jumpers.
The EXT B jumpers are located near U25. The SME B jumpers are located just below U28.
(Refer to the printed circuit board, Figure 5-2, on page 28.) The Receive and Transmit Clock
jumpers must be selected to agree with the synchronous port DIP Shunt configuration as DTE or DCE.
When the synchronous port has been configured as DTE, Transmit and Receive Clock must be optioned
for EXTERNAL. Install both EXT B jumpers. Remove both SME B jumpers. Port B Baud Rate Switches
(SW1, Switches #5 to #8) must all be in the OFF position.
When the synchronous port has been configured as DCE, Transmit and Receive Clock must be optioned
for INTERNAL. Remove both EXT B jumpers. Install both SME B jumpers. Port B Baud Rate switches
(SW1, Switches #5 to #8) must then be set to match the synchronous baud rate of your external device.
3.4.6 CARRIER OPTIONS
If the Carrier Detect signal is to be driven by the A/S-2G configuration (DCE), the jumper labeled CAR
B ENB must be installed. CAR B ENB is located next to U19. Refer to the printed circuit board, Figure
5-2, on page 28.
The carrier control jumper, CARR B, is located in between U18 and U19 on the circuit board (See
Figure 5-2 on page 28). For most applications, the jumper should be placed over the CNT position.
3.4.7 CABLE REQUIREMENT
Use an RS-232 cable which is pinned straight through, i.e. 1 to 1, 2 to 2, 3 to 3, etc., to connect the
A/S-2G’s synchronous port to a modem, modem eliminator, or terminal. Leads 1 through 8, 15, 17, 20,
and 22 are required (see Section 5.3 on page 25).
PROTOCOL CONVERTER A/S-2G
14
3.4.8 COMMAND PASS-THRU
To use the command pass-thru feature, the command must be preceded by &% and terminated by &%.
Example: &%-Command-&%
Commands consist of character pairs. Each pair must represent a valid Hexidecimal value (i.e. zero
through 9 or A through F). Example: To send an escape sequence to an attached ASCII device, such as
“ESC A,” the following EBCDIC string must be sent to the A/S-2G: &%lB41&%.
CHAPTER 4: Operation
4.0 Operation
By its nature, a protocol converter must operate differently in each direction, since it is communicating
with separate devices. Therefore, its operation will be discussed separately for asynchronous to
synchronous operation and for synchronous to asynchronous.
4.1 ASYNCHRONOUS DEVICE TO SYNCHRONOUS DEVICE
4.1.1 LINE CONTROL
When the A/S-2G is initially connected to an AC power source or reset, the asynchronous device can
transmit data.
When the synchronous side has control of the line, a turnaround cannot occur until an “End of
Transmission” character has been entered from the controlling device. This character will be an EOT
(EBCDIC 37 Hex) on the synchronous side.
4.1.2 ASYNCHRONOUS INPUT DATA FORMAT
The asynchronous side of the A/S-2G is programmed to accept asynchronous data within the following
parameters:
1 start bit
7 data bits
1 parity bit (any parity is accepted, but ignored. Parity is user-selectable by SW2, Switches #7 and #8.)
1 or 2 stop bits (user-selectable with SW3, Switch #8)
Half or full duplex (user-selectable with SW2, Switch #3)
75 to 9600 bps (user-selectable by SW1, Switches #1 through #4)
ASCII code
4.1.3 DATA CONVERSION
The A/S-2G converts Asynchronous ASCII data byte-for-byte to EBCDIC equivalents, blocks it
appropriately and wraps it in the applicable protocol envelope. The only characters not converted
byte-for-byte are listed in Tables 4-1 and 4-2.
4.1.4 RECORD AND BLOCK SIZE
In preparing asynchronous data for communi-cation to a synchronous device, the A/S-2G groups
characters according to the block size selected (SW2, Switches #5 and #6).
In accordance with 2770 and 2780 protocols, the A/S-2G adds an IUS (Hex 1F) followed by 2 block
check characters (which are subsequently stripped by the EBCDIC device) after each 80 characters until
a CR is received. The CR signifies the end of a block. If SW3, Switch #5 is OFF, the A/S-2G will fill the
block with spaces until it reaches the block size specified by SW3, Switches 5 and 6. If SW3, Switch #5
is ON, the block will end immediately after the CR.
ASCII CHARACTERS TRANSLATED TO EBCDIC
ASCII to EBCDIC
Control D EOT (AA AA 32 32 32 32 37 FF)
1B (ASCII Hex) ESC (EBCDIC) (Hex 27)
CR (when SW3, Switch #3 is OFF) NL (New Line) (EBCDIC 15 Hex)
Table 4-1. ASCII characters translated to EBCDIC.
15
PROTOCOL CONVERTER A/S-2G
16
In 3741 protocol, each block contains only one record. If SW3, Switch #5 is OFF, the A/S-2G will fill
the block with spaces until it reaches 128 characters . If SW3, Switch #5 is ON, the block will end
immediately after CR.
NOTE:
• If SW3, Switch #3 is OFF, then one character of the total count must be allotted to the CR. The CR
will be translated into EBCDIC as a NL (New Line). Thus, if block size is specified as 80 characters,
79 characters plus the CR would make a full 80 character record. Entering 80-characters and a CR
would cause 2 records to be sent: one with the 80 characters; the second with the NL character and,
if SW3, Switch #5 is OFF, 79 spaces.
• When SW3, Switch #3 is ON, the A/S-2G will delete CR from the character count and send no
representation of the CR with the EBCDIC data.
4.1.5 USE OF CARRIAGE RETURN
(
A) 2770/2780 MODE
Data from the asynchronous device is buffered (stored in RAM) until a CR (ASCII 0D Hex) is entered.
If the A/S-2G receives asynchronous characters up to the selected block size without receiving a CR
character, the A/S-2G will add an IUS character and a 2-byte CRC sequence to the block.
When the A/S-2G receives a CR, the A/S-2G sends any buffered data to the synchronous device with
an ETB (EBCDIC Hex 26).
The last block of asynchronous data must end with a “Control D” (ASCII Hex 04). The A/S-2G will
send the block, adding with an ETX (EBCDIC Hex 03). After receiving a positive acknowledgement,
the A/S-2G sends an EOT.
(
B) 3741/3780 MODE
Data from the asynchronous device is buffered until a CR (ASCII 0D Hex) is entered. When the
A/S-2G receives a CR, the A/S-2G inserts an IRS (EBCDIC 1E Hex). Data will continue to accumulate
until the selected block size is exceeded. At this point, the A/S-2G sends the full block of data.
The last block of asynchronous data must end with a “Control D” (ASCII Hex 04). The A/S-2G will
send the block, adding with an ETX (EBCDIC Hex 03). After receiving a positive acknowledgement,
the A/S-2G sends an EOT.
4.1.6 FLOW CONTROL
The input buffer (RAM) is capable of storing up to 1720 characters. The asynchronous device can
continuously send data to the A/S-2G if RAM is available and the character string contains a CR code
before the buffer fills. (However, the maximum block size that is acceptable to the synchronous device
must be considered.)
ASCII CHARACTERS NOT TRANSLATED TO EBCDIC
CR (Carriage Return) when SW3, Switch #3 is ON, LF (Line Feed), Control characters are not passed.
Character Hex Character Hex
NUL 00 ACK 06
SOH 01 DLE 10
STX 02 NAK 15
ETX 03 SYN 16
EOT 04 ETB 17
ENQ 05 US 1F
Table 4-2. ASCII characters not translated to EBCDIC.
CHAPTER 4: Operation
17
If SW3, Switch #7 is OFF, the A/S-2G will send an X-OFF (ASCII DC3, 13 Hex) to the asynchronous device
when RAM reaches a nearly-full state. This prevents data from being lost due to a buffer overrun. When
RAM space is available, the A/S-2G will send an X-ON (ASCII DC1, 11 Hex) to resume transmission.
Alternatively, if SW3, Switch #7 is ON, the A/S-2G will lower the DTR (Pin 20) when RAM reaches a
nearly-full state. When RAM space is available, the A/S-2G will again raise DTR to resume transmission.
4.1.7 PRESENTATION OF DATA FROM A/S-2G TO SYNCHRONOUS DEVICE
When an asynchronous device begins transmission to the A/S-2G and the A/S-2G has enough data for
a block, the A/S-2G bids for the synchronous line and proceeds in standard bisynchronous protocol.
See the Data Flow Diagrams on pages 15 through 19.
NOTE
Bracketed sections indicate a selectable option. Arrows indicate the direction of data flow.
4.1.8 VERIFICATION OF DATA RECEPTION
When operating in full duplex mode from the asynchronous side, SW3, Switches #1 and #2 permit visual
assurance of accurate and complete transmission. When SW3, Switch #1 is ON, the A/S-2G will
immediately echo back all the data it receives from the asynchronous device. When SW3, Switch #2 is
ON, the A/S-2G will send a CR, LF, and EOT to the asynchronous device after a complete transmission
and a line turn-around have successfully been completed.
4.1.9 LINE TURNAROUND
The final record transmitted from the asynchronous side must be terminated with a “Control D” (ASCII
04 Hex) character. This notifies the A/S-2G that the asynchronous device has completed its entry and is
relinquishing the line. After all data is sent, the A/S-2G will send an EOT sequence to the synchronous
side.
Data Flow — A/S-2G to Synchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
Characters up to maximum
BSC Block size (2770, 2780,
3780) or one 128 character
record (3741) terminated by
CR (0D Hex) = Block A of
data received in start/stop
format
(Echo all but CR LF)
Line Bid
AA AA 32 32 32 32 2D FF FF
ACK 0
Positive Acknowledgment—
Even AA AA 32 32 32 32 10
70 FF FF
ENQ
Send block A
PROTOCOL CONVERTER A/S-2G
18
Data Flow — A/S-2G to Synchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
*Assumes block size of 80 is selected.
IF 2270 - 2780
AA AA 32 32 32 32 02
(text up to 80 characters),
IF, BCC1, BCC2; etc. (last
record 26, BCC1, BCC2, FF
FF
IF 3780
AA AA 32 32 32 32 02
(text up to 80* characters
with records separated by
1E, last record in block 1E,
26, BCC1, BCC2, FF FF
IF 3741
AA AA 32 32 32 32 02
(up to 128 characters), 26,
BCC1, BCC2, FF FF
ACK 1
Positive Acknowledgment—
Odd AA AA 32 32 32 32 10
61 FF FF
ACK 0
(Echo CR LF)
Block B of data
(Echo all but CR LF)
(Echo CR LF)
Block C of data
(Echo all but CR LF)
Block of D of data begins
Send block B
CHAPTER 4: Operation
19
Data Flow — A/S-2G to Synchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
ACK 1
NAK
Negative Acknowledgment
AA AA 32 32 32 32 3D FF FF
ACK 0
WAK
AA AA 32 32 32 32 6B FF FF
Holds up transmission while
buffer clears DC3 (ASCII 13
Hex) or drop DTR CTS or
user-specified lead
Frees up buffer space.
(Echo CR LF)
Allow resumption of
transmission DC1 (ASCII 11
Hex) or raise DTR
Complete block D
Send block E
(Echo all but CR LF)
X-OFF
Send block C
X-ON
Send block D
Resend block D
Send block E
If A/S-2G buffer is nearly full when asynchronous device is transmitting:
If synchronous device has WAK capability and buffer is full:
2-second interval
If data not properly received by synchronous device or
synchronous device has no WAK capability and buffer is full:
PROTOCOL CONVERTER A/S-2G
20
Data Flow — A/S-2G to Synchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
WAK
ACK 1
ACK 0
AA 32 32 32 32 02 2D FF FF
NAK
AA AA 32 32 32 32 3D FF FF
(Echo CR LF)
Send block F
(Echo all but CR LF)
(Echo CR LF)
Send block G,
(end with EOT Hex 04)
(Echo all but CR LF EOT)
ENQ
ENQ
Send block F
TTD
Send block G
If data not yet available from asynchronous device:
Line release or turnaround:
2-second interval
WAK resets ENQ counter
Sync device buffer space available
If over 3-second interval
CHAPTER 4: Operation
21
Data Flow — A/S-2G to Synchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
*Assumes block size of 80 is selected.
IF 2270 - 2780
AA AA 32 32 32 32 02
(text up to 80 characters),
IF, BCC1, BCC2; etc. (last
record 03, BCC1, BCC2, FF
FF
IF 3780
AA AA 32 32 32 32 02
(text up to 80* characters
with records separated by
1E, last record in block 1E,
03, BCC1, BCC2, FF FF
IF 3741
AA AA 32 32 32 32 02
(up to 128 characters), 03,
BCC1, BCC2, FF FF
ACK 1
AA AA 32 32 32 32 37 FF FF
(Echo CR LF EOT)
Send EOT
Line is now idle
PROTOCOL CONVERTER A/S-2G
22
4.2 SYNCHRONOUS DEVICE TO ASYNCHRONOUS DEVICE
4.2.1 LINE CONTROL
When the A/S-2G is initially connected to an AC power source or reset, the synchronous device can gain
control of the line by sending an ENQ.
When the asynchronous side has control of the line, a turnaround cannot occur until an “End of
Transmission” character has been entered from the controlling device. This character will be a “Control
D” (ASCII 04 Hex) on the asynchronous side.
4.2.2 SYNCHRONOUS INPUT DATA FORMAT
The synchronous side of the A/S-2G is programmed to receive data whose format is completely
specified by the protocol in use (2770, 2780, 3741, or 3780). It will be in EBCDIC code at a data rate of
up to 9600 bps.
4.2.3 DATA CONVERSION
The A/S-2G converts all synchronous EBCDIC data characters byte-for-byte to ASCII characters. The
A/S-2G strips synchronization and protocol characters and adds asynchronous start and stop bits. The
only exceptions in translating EBCDIC characters to ASCII Characters are listed in Tables 4-3 and 4-4
below.
4.2.4 FLOW CONTROL
The input buffer (RAM) is capable of storing up to a maximum of 1720 characters. The synchronous
device can continuously send data to the A/S-2G so long as RAM is available. When a nearly-full state is
reached (as determined by the selected block size), the A/S-2G will send a WAK (Wait
Acknowledgement) to halt synchronous transmission until memory is available.
4.2.5 VERIFICATION OF DATA RECEPTION
The A/S-2G uses the standard synchronous pro-tocol, ensuring data receipt and integrity through the
standard ACK (Positive Acknowledgement), NAK (Negative Acknowledgement), and CRC-16 (cyclic
redundancy check 16th degree polynominal structures).
4.2.6 LINE TURNAROUND
The final transmission from the synchronous side will be the EOT sequence (EBCDIC Hex 37). This
releases the line and allows the A/S-2G to enter an idle mode wherein it will accept a line bid from
either side.
EBCDIC CHARACTERS TRANSLATED TO ASCII
EBCDIC to ASCII
NL (New Line) (Hex 15) CR LF
EE or 27 ESC
ESC S CR LF CR LF
ESC T CR LF CR LF CR LF
ESC A FF
ESC M CR, Suppress LF
all other escapes CR LF
Table 4-3. EBCDIC characters translated to ASCII.
CHAPTER 4: Operation
23
Should the A/S-2G receive a DLE EOT (disconnect), the A/S-2G will cycle the synchro-nous DTR lead
off for 2 seconds. This action will disconnect a phone line if the DTR B jumper is set for CNT.
NOTE
The A/S-2G will cycle the synchronous DTR lead off for 2 seconds whether the DLE EOT sequence comes from
the synchronous or asynchronous side.
EBCDIC CHARACTERS STRIPPED
Character Hex Character Hex
NUL 00 ACK 2E
SOH 01 DLE 10
STX 02 NAK 3D
ETX 03 SYN 32
EOT 37 ETB 26
ENQ 2D
Table 4-4. EBCDIC characters stripped.
PROTOCOL CONVERTER A/S-2G
24
Data Flow — A/S-2G to Asynchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
ENQ
Send data block A
Send data block B
ENQ
ENQ
Send data block C
Unformatted mode—
successive characters
(including spaces) appear
one after another as sent
ACK 0
ACK 1
Send block A
WAK
WAK
Send block B
ACK 0 (when
buffer
available)
ACK 1
Send block C
If A/S-2G buffer is nearly full when synchronous device is transmitting:
2-second interval
2-second interval
WAK resets ENQ counter with
respect to ENQ time out
CHAPTER 4: Operation
25
Data Flow — A/S-2G to Asynchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
Send data block D
Send data block D
Send data block E
Retransmit block E
TTD
TTD
NAK
ACK 0
when available
Send block D
NAK
ACK 1 (when
correctly
received)
Send block E
NAK
NAK
If data not properly received by A/S-2G:
If data not yet available from synchronous device
while synchronous line to A/S-2G is engaged:
2-second interval from previous ACK
2-second interval
Continues until data available
PROTOCOL CONVERTER A/S-2G
26
Data Flow — A/S-2G to Asynchronous Device
Bisynchronous Device A/S-2G Converter Asynchronous Device
Send data block F
(last block)
EOT
ACK 0
Send block F
Send C R LF EOT
to asynchronous
device if SW3,
switch #2 is ON
Line can now be turned around or A/S-2G in idle mode
Line release or turnaround
CHAPTER 5: Conversions and Connections
27
5.0 Conversions and Connections
5.1 TRANSPARENCY MODE OF OPERATION
With a special transparency PROM installed, the A/S-2G will communicate with a host system in IBM
binary synchronous transparent mode. To special-order the transparency PROM, please call technical
support.
In transparent mode, no character translations are performed in either direction, allowing transmission
of binary file such as raw data or program object files.
In accordance with IBM specifications, each data block is bracketed with a protocol envelope consisting
of a DLE STX (EBCDIC 10 Hex, 02 Hex) at the beginning and DLE ETB (EBCDIC 10 Hex, 26 Hex) at
the end. Should a DLE (10 Hex) occur within the data block, a second DLE (10 Hex) is inserted by the
sending device to eliminate the possibility of a legal DLE sequence occurring by chance in the data.
The A/S-2G software automatically inserts or strips the extra DLE (10 Hex) when necessary.
Transparency mode always sends fixed length blocks. Block size is selected with SW2, Switches #5 and
#6. The variable/fixed switch only pertains to the last (partial) block received from the asynchronous
port. The A/S-2G software detects the end of incoming asynchronous data in one of two ways:
1. Receipt of an ASCII ESC Control-D sequence (1B Hex, 04 Hex), with no other data
following for one second.
2 No asynchronous data received for a period of twelve seconds.
When one of these conditions occurs, the A/S-2G will transmit the last block terminated with DLE ETX.
Upon acknowledgement of this last block, an EOT sequence is sent.
The transparency mode software will accept data blocks of any size (assuming no memory overflow)
and will handle variable length or fixed blocks.
5.2 INSTALLING OR REPLACING PROMS
1. Unplug the A/S-2G from the AC power.
2. Remove the cover of the A/S-2G.
3. To locate the PROM, see Figure 5-2 on page 28. The PROM is located on U11, between U10 and
U12.
4. Using a PROM extraction tool or a small screwdriver, pry the PROM out of the socket until it is loose.
Then, slide the tool or your fingers under the PROM and gently lift up. You must lift directly upward
to avoid damaging the teeth of the PROM.
5. Now insert your new PROM. It may require its pins to be pushed in a little. If so, use a table top
to do this. This will ensure that the pins stay aligned.
Caution
Note the orientation of the indentation on one of the prom’s short ends—it must line up with the matching
indentation on the socket into which it is inserted.
PROTOCOL CONVERTER A/S-2G
28
5.3 RS-232 CABLE CHART
RS-232C pins are defined as follows:
1 = Chassis (or Frame or Protective) Ground F-GND, C-GND, or P-GND
2 = Transmit Data TD or TXD
3 = Receive Data RD or RXD
4 = Request to Send RTS
5 = Clear to Send CTS
6 = Data Set Ready DSR
7 = Signal Ground S-GND
8 = Carrier Detect CD
15 = Transmit Signal Element Timing (Clock) T-CLK or TXCLK
17 = Receive Signal Element Timing (Clock) R-CLK or TXCLK
20 = Data Terminal Ready DTR
22 = Ring Indicator RI
Figure 5-1. The RS-232 Interface.
RS-232 Interface
SIGNAL
DESTINATION
DCE TRANSMITTER SIGNAL ELEMENT TIMING
DTE TRANSMITTER SIGNAL ELEMENT TIMING
SECONDARY TRANSMITTED DATA
SECONDARY RECEIVED DATA
RECEIVER SIGNAL ELEMENT TIMING
SECONDARY REQUEST TO SEND
DATA TERMINAL READY
SIGNAL QUALITY DETECTOR
RING INDICATOR
DATA SIGNAL RATE SELECTOR
NUMBER
PIN
14
15
16
17
18
19
20
21
22
23
24
25
PIN
NUMBER
1
PROTECTIVE GROUND
2
TRANSMITTED DATA
3
RECEIVED DATA
4
REQUEST TO SEND
5
CLEAR TO SEND
6
DATA SET READY
7
SIGNAL GROUND/COMMON RETURN
8
RECEIVED LINE SIGNAL DETECTOR
9
+VOLTAGE
10
-VOLTAGE
11
12
SECONDARY RECEIVED LINE SIGNAL DETECTOR
13
SECONDARY CLEAR TO SEND
SIGNAL
DESTINATION
CHAPTER 5: Conversions and Connections
29
5.4 CODE CONVERSIONS
The conversions used in the standard 2770, 2780, 3741, and 3780 PROMs are shown in the following
charts. Your PROM can be customized. Please call Technical Support if you have particular translation
requirements.
Abbreviations:
Dir. = Direction of Conversion
NP = No pass (no translation in either direction)
Character
or ASCII EBCDIC
Graphic Hex Dir. Hex Comments
NUL 00 NP 00
SOH 01 01
STX 02 02
ETX 03 03
EOT 04 37
ENQ 05 2D
ACK 06 2E
BEL 07 2F
BS 08 16
36 Numeric BS
HT 09 05
39 Required Tab
LF 0A 25
VT 0B OB
FF 0C OC
0A Repeat WP
3A Required Page End
CR 0D OD
CR 15
CR 06 Required CR
CR 1E
CR 33 Index Return
SO OE OE
SI OF OF
DLE 10 10
DC1 11 11
DC2 12 12
DC3 13 13
DC4 14 3C
NAK 15 3D
SYN 16 NP 32
ETB (EOB) 17 NP 26
CAN 18 18
EM 19 19
SUB 1A 3F
ESC 1B 27
EE
1C 22
FS 1C 1C
GS 1D 1D
Character
or ASCII EBCDIC
Graphic Hex Dir. Hex Comments
29
RS 1E 35 IRS EBCDIC
US 1F 1F
2C
SPACE 20 40
41 Required Space
E1 Numeric Space
! 21 5A EBCDIC DP
"22 7F
#23 7B
$24 5B
%25 6C
&26 50
'27 7D
(28 4D
)29 5D
*2A 5C
+2B 4E
,2C 6B
-2D 60
CA SYL. Hyphen
.2E 4B
/2F 61
030 F0
131 F1
232 F2
333 F3
434 F4
535 F5
636 F6
737 F7
838 F8
939 F9
:3A 7A
;3B 5E
3C
=3D 7E
3E
?3F 6F
PROTOCOL CONVERTER A/S-2G
30
Character
or ASCII EBCDIC
Graphic Hex Dir. Hex Comments
@40 7C
A41 C1
B42 C2
C43 C3
D44 C4
E45 C5
F46 C6
G47 C7
H48 C8
I49 C9
J4A D1
K4B D2
L4C D3
M4D D4
N4E D5
O4F D6
P50 D7
Q51 D8
R52 D9
S53 E2
T54 E3
U55 E4
V56 E5
W57 E6
X58 E7
Y59 E8
Z5A E9
5B 4A
5B AD
5C E0
5D 4F
5D BD
^ 5E 5F - EBCDIC
5F 6D EBCDIC underscore
“60 79
60 14
a61 81
b62 82
c63 83
d64 84
e65 85
f66 86
g67 87
h68 88
i69 89
j6A 91
k6B 92
l6C 93
m6D 94
n6E 95
Character
or ASCII EBCDIC
Graphic Hex Dir. Hex Comments
o6F 96
p70 97
q71 98
r72 99
s73 A2
t74 A3
u75 A4
v76 A5
w77 A6
x78 A7
y79 A8
z7A A9
7B C0
7B 8B
| 7C 6A 1/2 EBCDIC
7D D0
7D 9B
7E A1
DEL 7F 07
SPECIAL CONVERSIONS
EBCDIC to ASCII Comments
ESC A FF
ESC M CR Suppress LF for underscore
ESC S CR LF Two CR LF sequences
CR LF
ESC T CR LF Three CR LF sequences
CR LF
CR LF
Any other ESC CR LF
sequence
NL CR LF
ASCII to EBCDIC Comments
CR NL This occurs only when SW3,
Switch #3 is OFF.
CHAPTER 5: Conversions and Connections
UNASSIGNED EBCDIC CODE
04 2B 46 58 71 8D AB B7 CE ED
08 30 47 59 72 8E AC B8 CF EF
09 31 48 62 73 8F AE B9 DA FA
17 34 49 63 74 90 AF BA DB FB
1A 38 51 64 75 9A B0 BB DC FC
20 3B 52 65 76 9C B1 BC DD FD
21 3E 53 66 77 9D B2 BE DE FE
23 42 54 67 78 9E B3 BF DF FF
24 43 55 68 80 9F B4 CB EA
28 44 56 69 8A A0 B5 CC EB
2A 45 57 70 8C AA B6 CD EC
5.5 PRINTED CIRCUIT BOARD LAYOUT
Figure 5-2. Printed Board Circuit Layout.
31
P1
C. T.
RESET
OPT
GND
EARTH
11VA C
11VA C
SW4
DSR
DB25
PORT A
DTR
DB25
PORT B
U27
U28
DTE-A
DCE-A
A
DTR
U23
U22
CTS A
ON CNT
U18
XTAL
U9
U7
U8
DSR A DSR B R1
A
28 64
ON
ON CNT CARR B
CARR
CNT
U12 U16
EPROM
CAR B
U19
CNT
ENB
B
SME
B
SME
U24
CD
ENB
CAR A
U20
CDB
DETECT
CDA
DETECT
6116 6264
EXT B
CTS
DCE-B
CNT
B
U29
U25
ON
U17 U21
U13
U30
DTE-B
EXT
U26
DTR B
CNT ON
SW1
ON
18
SW2
ON
18
SW3
ON
18
TXD
A
RXD
A
RTSACTS
A
DTR
A
DSRACDAACDB
TXD
B
B
RTSBCTS
RXD
B
DTR
B
B
TXC
RXC
B
PWR
B
DSR
1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746
© Copyright 1998. Black Box Corporation. All rights reserved.
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