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USER
MANUAL
MODEL 2020 and
MODEL 2020N
Interface Powered
RS-232 to V.35 Converters
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com
Part #07M2020-E
Doc #077011UE
Revised 08/16/99
An ISO-9001
Certified Company
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1.0 WARRANTY INFORMATION
Patton Electronics warrants all Model 2020 and 2020N 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 Patton 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.
Patton 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 Models 2020 and 2020N generate and use 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 2020/2020N 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 from such
interference in a commercial installation. However, there is no guarantee that interference will not occur in a particular installation. If the
Model 2020/2020N does cause interference to radio or television
reception, which can be determined by disconnecting the RS-232 or
V.35 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, re-orienting 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 CE NOTICE
The CE symbol on your Patton Electronics equipment indicates
that it is in compliance with the Electromagnetic Compatibility (EMC)
directive and the Low Voltage Directive (LVD) of the Union European
(EU). A Certificate of Compliance is available by contacting Technical
Support.
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1.3 SERVICE
All warranty and non-warranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Support: (301) 975-1007; http://www.patton.com; or, sup-
port@patton.com.
NOTE: Packages received without an RMA number will not be
accepted.
Patton Electronics' technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Model 2020 or 2020N. Technical Support hours: 8AM to 5PM EST,
Monday through Friday.
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2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton 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 Patton Electronics Technical Support at (301)-975-1007.
2.1 FEATURES
• Bi-directionally converts synchronous RS-232 to V.35
• Data rates to 384 Kbps, full or half duplex
• Transparent to protocol
• No AC power or batteries required
• DCE/DTE strap selectable
• DB-25 and M/34 connectors with integral 6 ft cable (Model 2020)
• Dual DB-25 connectors with integral 6ft cable (Model 2020-25)
• DB-25 and M/34 connectors in one plastic enclosure (Model
2020N)
• Circuitry housed in ultra-miniature case
• Made in the USA.
2.2 DESCRIPTION
The Model 2020 and 2020N RS-232 to V.35 converters let a
synchronous RS-232 device communicate bi-directionally with a synchronous V.35 device. The Model 2020/2020N require no external AC
power or batteries to operate and supports data rates to 384 Kbps.
Operating full or half duplex, the Model 2020 passes all necessary
clocking and control signals, and is transparent to protocol.
The Model 2020 connects directly to the synchronous RS-232
interface using a male or female DB-25 connector. A male or female
M/34 connector at the end of an integral 6 ft cable plugs into the V.35
device. The Model 2020-25 substitutes a male or female DB-25 on the
V.35 interface. The Model 2020N house both DB-25 and M/34 connectors within the same enclosure.
An internal DCE/DTE strap allows the user to configure the Model
2020/2020N as "DCE to DTE" or "DTE to DCE". In most cases, this
eliminates the need for special crossover cables. Housed in an ultraminiature case measuring only 2.66" x 2.10" x 0.73", the Model 2020
fits easily into tight locations. The Model 2020N measures a tiny
3.20”L x 2.10”H x 0.90”W.
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3.0 CONFIGURATION
The Model 2020/2020N is designed to be easy to use. In most
cases you will not need to configure the Model 2020/2020N in
any
way: just plug it in and go! The Model 2020 is transparent to protocol,
including data rate and clocking method. the only configuration you
may need to do is for DTE/DCE orientation. This procedure is
described below.
3.1 SETTING DCE/DTE ORIENTATION
The Model 2020/2020N installs between DTE devices such as
terminals and host computers, and DCE devices such as modems,
multiplexers and CSU/DSUs. Most often the DTE device will be RS232, and the DCE device will be V.35. Therefore, the default
DCE/DTE setting for the Model 2020 is RS-232 DCE to V.35 DTE,
based on how the Model 2020 "sees" its
own
orientation. For example, if the Model 2020 sees its own RS-232 port as DCE, it will want to
plug into an RS-232 DTE device such as a terminal.
If you need to reverse the DCE/DTE orientation of the Model 2020
so that the RS-232 port is DTE and the V.35 port is DCE, follow the
step-by-step instructions below (note: it is not possible to configure the
Model 2020/2020N so that both ports are DTE or DCE).
3.1.1 OPENING THE CASE
The DCE/DTE strap on the Model 2020/2020N is located on the
PC board. To access the PC board you will need to open the plastic
case.
1. Simply insert a small flathead screwdriver or similar tool
between the DB-25 connector and the lip of the case as
shown in Figure 1, below.
Figure 1. Inserting the screwdriver
RS-232
Interface
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2.
Gently
twist the screwdriver to pop the case open as shown in
Figure 2, below. Be careful not to damage the case or connector as you twist the screw driver.
3. Once you have opened the case of the Model 2020/2020N,
you will see the DCE/DTE strap located on the PC board in
the position shown in Figure 3, below. The DCE/DTE strap
is oriented closest to the RS-232 interface.
4. The arrows on top of the strap indicate the orientation of the
Model 2020's ports. For example, if the "DCE" arrow is pointing toward the DB-25 connector, then the Model
2020/2020N's RS-232 port is configured as a DCE and will
connect to a RS-232 DTE port. The arrow pointing toward
the cable at the rear of the PC board shows the orientation of
the Model 2020's V.35 port.
5. To reverse the DCE/DTE orientation, pull the entire strap out
of its socket and rotate it 180 degrees. Then plug it back into
the socket. You will see that the arrows on top now point in
the opposite directions showing the new DCE/DTE orientation
of the Model 2020.
6. When you're done, realign the case halves (don't forget the
captive screws and saddle washers) and snap them back
together.
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Figure 2. Popping open the case
DCE/DTE
Strap
Figure 3. DCE/DTE strap orientation on PC board
RS-232
Interface
RS-232
Interface
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4.0 INSTALLATION
After you have configured the DCE/DTE strap, all you need to do
is plug the Model 2020 or 2020N into the proper device ports. Figures
4 and 5 show how to intstall the Model 2020/2020N.
*NOTE: The diagrams below show the Model 2020 in the
installed application. If you are using a Model 2020N, connect the
RS-232 interface directly to the RS-232 equipment and connect
the V.35 interface to the V.35 interface.
4.1 CONNECTING AN RS-232 DTE TO A V.35 DCE*
Figure 4 (below) illustrates proper connection of an RS-232 DTE
to a V.35 DCE using the Model 2020. The RS-232 interface of the
Model 2020/2020N must be configured as DCE.
4.2 CONNECTING A V.35 DTE TO AN RS-232 DCE*
Figure 5 (below) illustrates proper connection of a V.35 DTE to
an RS-232 DCE using the Model 2020. The RS-232 interface of the
Model 2020/2020N must be configured as DTE.
4.3 CONNECTING THE MODEL 2020-25
The Model 2020-25 is connected the same way as the standard
Model 2020, with the exception that the V.35 interface has a DB-25
connector instead of an M/34 connector. The DB-25 carries the same
signals as the M/34, but is pinned according to the RS-530 Standard.
Please refer to Appendix B for specific pin out information.
AAPPPPEENNDDIIXX AA..
MODEL 2020 AND 2020N SPECIFICATIONS
Interfaces: EIA RS-232/ITU/CCITT V.24 to ITU/CCITT
V.35/EIA RS-530
Data Rates: 0 - 384 Kbps
Transmission Mode: Synchronous, full or half duplex
Protocol: Transparent to protocol
Clocking: Set by connected devices
Connectors: All Versions: DB-25 male or female on
RS-232 side;
Model 2020: M/34 male or female on V.35
side at the end of 6 ft. cable.
Model 2020-25: DB-25 male or female on
V.35 side at the end of 6 ft. cable.
Model 2020N: RS-232 Male or Female
with M/34 male or female on V.35 side.
Power Supply: None required. Uses power from interface
data and control signals
Temperature Range: 0-60 degrees C (32-140 degrees F)
Altitude: 0-15,000 feet (0-5,000 meters)
Humidity: 5 to 95% noncondensing
Dimensions: Model 2020: 2.66"L x 2.10"H x 0.73"W
(6.76cmL x 5.33cmH x 1.85cmW)
Model 2020N: 2.40”L x 1.73”H x 0.89”W
(6.10cmL x 4.39cmH x 2.26cmW)
Weight: Model 2020: 14 oz, including cable and
connectors
Model 2020N: 2.2 oz
7 8
Sync. Terminal
(DTE)
V.35 Modem
(DCE)
Figure 4. A Common RS-232 DTE to V.35 DCE Installation
V.35 Mini Computer
(DTE)
Sync. Modem
(DCE)
Figure 5. A common V.35 DTE to RS-232 DCE installation
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APPENDIX B
V.35 INTERFACE STANDARDS
APPENDIX C
RS-232 INTERFACE STANDARDS
9 10
1- (FG) Frame Ground
2- (TD) Transmit Data
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect
Transmit Clock - 15
Receive Clock - 17
Data Term. Ready (DTR) - 20
External Clock - 24
Test Mode (TM) - 25
RS-232C/V.24 INTERFACE (DB-25)
B
F
L
R
V
Z
DD
JJ
NN
A
E
K
P
U
Y
CC
HH
MM
D
J
N
T
X
BB
FF
LL
C
H
M
S
W
AA
EE
KK
A- Frame Ground
C- Request to Send
E- Data Set Ready
H- Data Terminal Ready
KM- (TM) Test Mode
P- Transmitted Data (A)
S- Transmitted Data (B)
U- Terminal Timing (A)
W- Terminal Timing (B)
Y- Transmit Timing (A)
AA- Transmit Timing (B)
Signal Ground -B
Clear To Send -D
Data Carrier Detect -F
Receive Data (A) -R
Receive Data (B) -T
Receive Timing (A) -V
Receive Timing (B) - X
CCITT V.35 Interface (M/34 Male)
1 - (FG) Frame Ground
2 - Transmit Data A
3 - Receive Data A
4 - (RTS) Request to Send
5 - (CTS) Clear to Send
6 - (DSR) Data Set Ready
7 - (SG) Signal Ground
8 - (CD) Carrier Detect
9 - Receive Clock B
11 - External Clock B
12 - Transmit Clock B
Data Term. Ready (DTR) - 20
CCITT V.35/EIA-530 INTERFACE (DB-25)
External Clock A - 24
Transmit Clock A - 15
Receive Clock A - 17
Transmit Data B - 14
Receive Data B - 16
Local Analog Loopback ( LAL) - 18
Remote Digital Loopback (RDL) - 21
Test Mode (TM) - 25
Local Analog Loopback (LAL) -L
Remote Digital Loopback (RDL) -N
Test Mode (TM) -NN
Local Analog Loopback (LAL) - 18
Remote Digital Loopback (RDL) - 21
9- External Power
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APPENDIX D
BLOCK DIAGRAM
TD-A
RD-A
TD-B
RD-B
PRS
T
TD
RD
2
3
RD
TD
3
2
RD-A
TD-A
RD-B
TD-B
RPT
S
TC-A
XC-A
XC-B
YUW
XC
TC
24
15
TC
XC
15
24
RS-232 V.35
AA
AA
TC-B
XC-A
TC-A
TC-B
U
Y
XC-B
RC-A
W
V
RC
17
RC-B
X
RTS
CTS
C
D
V.35
RTS
CTS
4
5
RS-232
DCD
DTR
FG
FHA
V.35
DCD
DTR
FG
8201
RS-232
+5V
-5VPOWER SUPPLY
AND
CTS
RTSXCTC
24154
5
DTR
DCD
DSR
6820
DATA
SWITCHING
REGULATOR
+V
SG
7
PATTON ELECTRONICS MODEL 2020 BLOCK DIAGRAM
SG
B
AUGUST 12, 1994 REV. D
DSR
6
DSR
E
V.35 DRIVER
DIFFERENTIAL
AMPLIFIER
V.35 DRIVER
DIFFERENTIAL
AMPLIFIER
DIFFERENTIAL
AMPLIFIER
V.35 DRIVER
11
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