B&B Electronics High Speed Asynchronous to Synchronous Converter... User manual

2011AS3297 Manual Cover Page
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH [phone] -- FAX [phone]
High Speed Asynchronous
to Synchronous Converter
Model 2011
Documentation Number 2011AS3297
B&B Electronics Mfg. Co. Inc.
707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350
PH [phone] -- FAX [phone]
Internet:
http://www.bb-elec.com
[email protected]
[email protected]
B&B Electronics -- September 1997
Not Recommended for New Installations.
Please contact Technical Support for more information.

2011AS3297 Manual Table of Contents i
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH [phone] -- FAX [phone]
Table of Contents
1.0 WARRANTY INFORMATION................................................... 1
1.1 RADIO AND TV INTERFERENCE ........................................... 1
1.2 SERVICE.................................................................................. 1
2.0 GENERAL INFORMATION ...................................................... 2
2.1 FEATURES .............................................................................. 2
2.2 DESCRIPTION ......................................................................... 2
3.0 CONFIGURATION ................................................................... 3
3.1 ACCESSING INTERNAL SWITCHES...................................... 3
3.2 SETTING INTERNAL SWITCHES ........................................... 3
3.2.1 CHARACTER LENGTH ................................................. 4
3.2.2 EXTENDED SIGNALING RATE (ESR).......................... 4
4.0 INSTALLATION ........................................................................ 5
4.1 CONNECTING THE ASYNCHRONOUS PORT ...................... 5
4.2 CONNECTING THE SYNCHRONOUS PORT......................... 5
APPENDIX A: SPECIFICATIONS ................................................. 6
APPENDIX B: ASYNCHRONOUS PORT CONNECTIONS
(CONFIGURED AS DCE)............................................................... 7
APPENDIX C: SYNCHRONOUS PORT CONNECTIONS
(CONFIGURED AS DTE) ............................................................... 8
APPENDIX D: BLOCK DIAGRAM................................................. 9

2011AS3297 Manual 1
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH [phone] -- FAX [phone]
1.0 WARRANTY INFORMATION
B&B Electronics warrants all Model 2011 components to be free from
defects, and will, at our option, repair or replace the product should it fail
within one year from the first date of shipment.
This warranty is limited to defects in workmanship or materials, and
does not cover customer damage, abuse or unauthorized modification. If
this product fails or does not perform as warranted, your sole recourse shall
be repair or replacement as described above. Under no condition shall B&B
Electronics be liable for any damages incurred by the use of this product.
These damages include, but are not limited to, the following: lost profits,
lost savings and incidental or consequential damages arising from the use
of or inability to use this product. B&B Electronics specifically disclaims all
other warranties. expressed or implied, and the installation or use of this
product shall be deemed an acceptance of these terms by the user.
1.1 RADIO AND TV INTERFERENCE
The Model 2011 generates and uses 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 and television
reception. The Model 2011 is designed to provide reasonable protection
from such interference in a commercial installation. However, there is no
guarantee that interference will not occur in a particular installation. If the
Model 2011 does cause interference to radio or television reception, which
can be determined by disconnecting the RS-232 interface, the user is
encouraged to try to correct the interference by one or more of the following
measures: moving the computing equipment away from the receiver,
reorienting the receiving antenna and/or plugging the receiving equipment
into a different AC outlet (such that the computing equipment and receiver
are on different branches).
1.2 SERVICE
All warranty and non-warranty repairs must be returned freight prepaid
and insured to B&B Electronics. All returns must have a Return Materials
Authorization number on the outside of the shipping container. This number
may be obtained from B&B Electronics Customer Service at (815) 433-
5100.
Packages received without an RMA number will not be accepted.
B&B Electronics' technical staff is also available to answer any
questions that might arise concerning the installation or use of your Model
2011. Technical Service hours: 8AM to 5PM CST, Monday through Friday.

2 2011AS3297 Manual
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2.0 GENERAL INFORMATION
Thank you for your purchase of this B&B Electronics product. This
product has been thoroughly inspected and tested and is warranted for one
year parts and labor. If any questions or problems arise during installation
or use of this product, please do not hesitate to contact B&B Electronics
Technical Support at [phone].
2.1 FEATURES
• Conforms to CCITT V.22 and V.14 Standards
• Lets asynchronous terminals communicate with synchronous
modems and multiplexers
• Accepts character lengths to 11 bits
• Requires no AC power or batteries
• Supports data rates to 64 Kbps
• Automatically adjusts synchronous data rates
• Miniature size
• Plugs directly into async. or sync. DB-25 port
• Accepts external clocking
• Made in the USA
2.2 DESCRIPTION
The B&B Model 2011 asynchronous to synchronous converter plugs
directly into a local asynchronous DTE (terminal, PC, etc.) and connects
that DTE, via RS-232 cable, to a synchronous DCE. When the same set-up
is installed on the remote end, the local and remote DTEs can
communicate over the synchronous link.
Drawing power from either the synchronous or asynchronous
RS-232 interface, the Model 2011 needs no AC power or batteries to
operate and supports RS-232 data rates from 64 Kbps. Because the Model
2011 automatically adjusts the synchronous data rate to match the
asynchronous DTE's output rate, no data rate strapping is
necessary. The Model 2011 derives clocking externally from the clock of
the synchronous DCE, and imposes no limit on data block size. Characters
may be up to 11 bits long.
Measuring only 3.2" x 2.0" x .75", the Model 2011 is housed in a sturdy
ABS plastic case. It comes fully equipped with a DB-25 male connector and
a DB-25 female connector, which plug directly into the synchronous and
asynchronous ports.

2011AS3297 Manual 3
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3.0 CONFIGURATION
The Model 2011 is configured using internal DIP switches. Figure 1
shows the location of the Model 2011's configuration switches.
Figure 1. Switch locations on the Model 2011 PC board
3.1 ACCESSING INTERNAL SWITCHES
The Model 2011's DIP switches are mounted on the PC board. To
access the PC board, insert the blade of a small flathead screwdriver into
the slot on one side of the Model 2011's case, then pop the case open by
twisting the blade. Repeat on the other side of the case. You should now be
able to pull the case halves apart and access the DIP switches on the PC
board. Once you have set the switches properly, align the case halves and
snap them together.
3.2 SETTING INTERNAL SWITCHES
Three DIP switches are used to configure the Model 2011: two
switches set the character length and one switch matches the signaling
rates of the asynchronous and synchronous ports. Figure 2 shows the
orientation of the DIP switches.
Figure 2. DIP switch orientation

4 2011AS3297 Manual
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3.2.1 CHARACTER LENGTH
Switches SW1-1 and SW1-2 operate jointly to set the asynchronous
character length. The asynchronous character length setting is determined
by combining the number of start, stop, data and parity bits that make up
each character generated by the asynchronous DTE. The Model 2011 does
not care about the composition of each asynchronous character, only its
length is significant. Below are the combined switch settings that set the
four possible asynchronous character lengths:
SW 1-1 SW 1-2
8bit OFF ON
9 bit ON ON
10 bit OFF* OFF*
11 bit ON OFF
* Default settings
3.2.2 EXTENDED SIGNALING RATE (ESR)
The position of switch SW1-3 ensures that the asynchronous input
data rate matches the synchronous output data rate. When switch SW1-3 is
set to OFF, the asynchronous bit rate must match the synchronous clock
rate to a tolerance of -2.5% to +1%. When switch SW1-3 is set to ON, the
asynchronous bit rate must match the synchronous clock rate to a tolerance
of -2.5% to +2.3%.
SW 1-3
-2.5% to +1% OFF*
-2.5% to +2.3% ON
*Default settings
NOTE: Switch SW1-4 is not used.

2011AS3297 Manual 5
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4.0 INSTALLATION
The Model 2011 is designed to be used in pairs , with one unit installed
between an asynchronous DTE and a synchronous DCE on either end of a
synchronous communication link. Figure 3 illustrates a typical Model 2011
installation.
Figure 3. Typical Model 2011 application
4.1 CONNECTING THE ASYNCHRONOUS PORT
The asynchronous port of the Model 2011 is a DB-25 female and is
configured as "DCE". Therefore it wants to talk to a DTE device such as a
terminal or PC. The Model 2011 may be plugged directly into the DB-25
serial port of a DTE or connected via "straight through" cable.
4.2 CONNECTING THE SYNCHRONOUS PORT
The synchronous port of the Model 2011 is a DB-25 male and is
configured as "DTE". Therefore it wants to talk to a DCE device such as a
modem or multiplexer. The Model 2011 may be plugged directly into the
DB-25 serial port of a DCE or connected via "straight through" cable.

6 2011AS3297 Manual
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APPENDIX A: SPECIFICATIONS
Data Rates: Up to 64 Kbps
Clocking: Provided by modem or multiplexer
Buffer: 4 bit RTS override feature empties buffers before dropping RTS
Data Transmission: Full or half duplex
Connectors: DB-25 female on asynchronous port, DB-25 male on
synchronous port
Power Supply: None required; uses power from data and control signals
Temperature Range: 0-60°C (32-140°F)
Altitude: 0-15,000 feet
Humidity: Up to 95% non-condensing
Dimensions: 3.2" x 2.0" x 0.75"
Weight: 2oz.

2011AS3297 Manual 7
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APPENDIX B: ASYNCHRONOUS PORT
CONNECTIONS (CONFIGURED AS “DCE”)
Pin Name Description
1 FG Frame Ground; connected straight to synchronous port
2 TXD Transmit Data (to 2011); data input from asynchronous
port; Input to the 2011 power supply
3 RXD Receive Data (from 2011); data output to asynchronous
port
4 RTS Request to Send (to 2011); input to the power supply
5 CTS Clear to Send (from 2011); connected straight through to
synchronous port
6 DSR Data Set Ready (from 2011); connected straight through to
synchronous port
7 SG Signal Ground; connected straight through to synchronous
port
8 CD Carrier Detect (from 2011); connected straight through to
synchronous port
9 +DCV Connected straight through to synchronous port
10 -DCV Connected straight through to synchronous port
20 DTR Data Terminal Ready (to 2011); input to power supply
22 Rl Ring Indicator (from 2011); connected straight through to
synchronous port

8 2011AS3297 Manual
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APPENDIX C: SYNCHRONOUS PORT
CONNECTIONS (CONFIGURED AS “DTE”)
Pin Name Description
1 FG Frame Ground; connected straight to asynchronous
port
2 TXD Transmit Data (from 2011); data output to synchronous port
3 RXD Receive Data (to 2011); data input from the synchronous
port input to 2011 power supply
4 RTS Request to Send (from 2011); 4 bit delay from
asynchronous port (2011 waits 4 bits before dropping RTS
to the synchronous port; this facilitates use in a polling
environment)
5 CTS Clear to Send (to 2011); connected straight through to
asynchronous port
6 DSR Data Set Ready (to 2011); connected straight through to
asynchronous port
7 SG Signal Ground; connected straight through to
asynchronous port
8 CD Carrier Detect (to 2011); connected straight through to
asynchronous port
9 +DCV Connected straight through to asynchronous port
10 –DCV Connected straight through to asynchronous port
15 TXC Transmit clock (to 2011); used to synchronize data
conversion from 2011 to synchronous port
17 RXC Receive clock (to 2011); used to synchronize data
conversion from 2011 to synchronous port
20 DTR Data Terminal Ready (from 2011); input to power supply
22 Rl Ring Indicator (to 2011); connected straight through to
asynchronous port

2011AS3297 Manual 9
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APPENDIX D: BLOCK DIAGRAM