Patton electronic 1012B User Manual

USER
MANUAL

MODEL 1012B

Asynchronous
Carrier Controlled Short
Range Modem

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]
http://www.patton.com

Part# 07M1012B
Doc# 040061U,
Rev. B
Revised 1/22/08

An ISO-9001

Certified Company

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 1012B 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 Model 1012B generates and uses radio frequency electromagnetic
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 1012B has been tested and found to
comply with the limits for a Class A computing device in accordance with
the specifications in Subpart B of Part 15 of FCC rules, which are designed
to provide reasonable protection from such interference in a commercial
installation. However, there is no guarantee that interference will not occur
in a particular installation. If the Model 1012B 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, 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). In the event the user
detects intermittent or continuous product malfunction due to nearby high
power transmitting radio frequency equipment, the user is strongly advised
to take the following steps: use only data cables with an external outer
shield bonded to a metal or metalized connector.

1.2 SERVICE

All warranty and nonwarranty 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, [e-mail]. Notice:
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 Patton Model 1012B.
Technical Service hours: 8AM to 5PM EST, Monday through Friday.

1

2.0 GENERAL INFORMATION

Thank you or buying the Patton Model 1012B. This product has
been thoroughly inspected and tested and is warranted for One Year
parts and labor. Contact Patton Electronics Technical Support if you
have any questions.

2.1 FEATURES

• Supports up to 10 multi-point terminals

• Full or half duplex, point-to-point or multipoint

• Supports hardware handshaking

• External DCE/DTE switch

• Automatic equalization and gain control

• Transformer isolation

• No AC power required

• Supports data rates to 38,400 bps, distances to 6 miles

• Silicon Avalanche Diode surge protection

• Twisted pair connection via RJ-11, RJ-45, or terminal blocks (for
daisy chaining)

• Made in the U.S.A

2.2 DESCRIPTION

In a multi-point environment, the master transmits data to all of the
addressable slave devices (there can be up to 10 slave devices).
Typically the modem at the master site is set for

constant carrier

,

whereas the modems at the slave sites must be configured for

controlled carrier

. Automatic equalization and gain control ensure the
optimal performance for a specific environment. Environments vary in
the twisted-pair wire gauge, quality of the twisted-pair, the data rate,
length of the transmission line, number of slave devices on the circuit,
etc. The transformers eliminate problems caused by ground loops. With
all these features, the 1012B can be used in numerous types of
applications. Some of them are simple point-to-point between buildings,
multipoint applications, and point-to-point applications which require
passing a control signal from end-to-end.

The 1012B uses silicon avalanche diodes (SADs) for protection
against transients. With SADs, the clamping response is superior and
does not degrade in performance after transient “hits.” The
surge/transient protection protects the 1012B as well as the port to
which it is connected.

2

Figure 1. Model 1012B Board, showing switch and strap locations

3

3.0 CONFIGURATION

By default, the Model 1012B is configured to be a DCE with the
transmitter set for controlled carrier. If the 1012B is in controlled carrier
mode for multi-point operation, the transmitter is controlled by RTS (pin 4)
when it is a DCE, and controlled by CD (pin 8) when configured as a DTE.

The DTE/DCE slide switch (SW1 in Figure 1) is used to configure
DTE or DCE orientation. The RTS/CD control jumper (J2 in Figure 1) is
used to configure constant/controlled carrier mode.

Section 3.1 describes how to configure the DTE/DCE switch.
Section 3.2 provides information on configuring the transmitter to be

constant

or

controlled.

3.1 SETTING THE MODEL 1012B AS DCE OR DTE

Note: Remember that when the DTE/DCE switch is set for DCE,
the 1012B functions as a DCE device. Otherwise, when the switch is in
the DTE position, the short range modem operates as a DTE device..

SW1 (located inside the Model 1012B) controls the DTE/DCE
configuration of the Model 1012B. Figure 1 shows the location of the
DTE/DCE switch on the 1012B circuit board.

To change the DTE/DCE setting, do the following:

1. Using a small screwdriver, insert the tip into one of the slots in
the side of the Model 1012B (see Figure 2).

2. Rotate the screwdriver as shown in Figure 2 to open the case.

3. If the device connected to the Model 1012B is a PC, terminal
or host computer (or is wired like one), set switch SW1 to “DCE” (see
Figure 3). This causes the Model 1012B to behave like data
communications equipment.

4. If the device connected to the Model 1012B is a modem or
multiplexer (or is wired like one), set the switch to “DTE.” This setting
causes the Model 1012B to behave like data terminal equipment.

5. After you finish configuring the DTE/DCE switch, snap the
case halves back together, then go to section 4.0, “Installation.”

Figure 2. Using a small screwdriver to open the Model 1012B case

4

Figure 3. SW1 DTE/DCE switch

DCE

DTE

3.2 SETTING THE RTS/CD CARRIER CONTROL JUMPER

The RTS/CD jumper (see Figure 1) is identified as J2 inside the

1012B (see Figure 1). To access this strap, do the following:

1. Using a small screwdriver, insert the tip into one of the slots in

the side of the Model 1012B (see Figure 2).

2. Rotate the screwdriver as shown in Figure 2 to open the case.

3. The RTS/CD carrier control jumper setting on the 1012B
determines whether the transmitter is constantly on or is controlled by an
RS-232 control signal. When this jumper is removed from the pegs, the
1012B transmitter is constantly on. When the jumper is in place on the
pegs, the transmitter is controlled by either RTS or CD. When the control
signal is a positive voltage, the transmitter is turned on, if negative
voltage, the transmitter is off. See Table 1 for the correspondence
between DTE/DCE and RTS/CD parameters.

4. The RTS/CD carrier control jumper also controls which signal
will function as the Carrier Detect (CD) signal. If the DTE/DCE switch is
set to “DCE,” the carrier detect is output on Pin 8. If the DTE/DCE
switch is set to “DTE,” the carrier detect is output on Pin 4. Table 2
shows which control signal provides the carrier detect function, per the
DTE/DCE setting.

Note: For multi-point applications, it is necessary to have a jumper

in place on the pegs on the slave modems.

5. After you finish configuring the DTE/DCE switch, snap the
case halves back together and continue the installation process.

DTE/DCE Switch Setting DCE DTE

Carrier Detect Function Carrier detect is output Carrier detect is output

on pin 8 (CD) on pin 4 (RTS)

5

Table 2. Interaction of DTE/DCE switch and RTS/CD jumper

DTE/DCE Switch Setting DCE (Default) DTE

RTS/CD jumper in place Carrier activated by Carrier activated by

(default) RTS - pin 4 (default) CD - pin 8

RTS/CD jumper removed Carrier constantly ON Carrier constantly ON

Table 1. Interaction of DTE/DCE switch and RTS/CD strap

4.0 INSTALLATION

Once you have properly configured the Model 1012B, you are
ready to connect it to your system. This section tells you how to
connect the Model 1012B to the twisted pair and RS-232 interfaces,
and how to operate the Model 1012B.

4.1 HOW TO CONNECT TO THE TWISTED PAIR INTERFACE

The Model 1012B passes data and handshaking signals between
two RS-232 devices at distances to 6 miles (9.7 km) and data rates to

38.4 kbps. There are two requirements for installing the Model 1012B.

1. These units work in pairs. Therefore, you must have one Model
1012B at each end of a two twisted pair interfaces.

2. To function properly, the Model 1012B needs two twisted pair of
metallic wire. They must be unconditioned, dry metallic wire,
unloaded, between AWG 19 and 26 (the higher number gauges
may limit distance somewhat). Standard dial-up telephone
circuits, or leased circuits that run through signal equalization
equipment, are not acceptable.

For your convenience, the Model 1012B is available with the
following twisted pair interfaces: RJ-11 jack, RJ-45 jack, and terminal
blocks.

4.1.1 TERMINAL BLOCK TWISTED PAIR CONNECTION

If your application requires you to connect one or two pair of bare
wires to the Model 1012B, you will need to access the external terminal
blocks. The following instructions will tell you how to connect the bare
wires to the terminal blocks.

1. Strip the outer insulation from the twisted pairs about one inch
from the end.

2. Strip the insulation on each of the twisted pair wires about

0.25 inch.

6

Figure 4. Stripping the outer insulation from the twisted pairs

3. Connect one pair of wires to XMT+ and XMT- (transmit positive
and negative) on the terminal block, making careful note of
which color is positive, and which color is negative.

4. Connect the other pair of wires to RCV+ and RCV- (receive
positive and negative) on the terminal block, again making
careful note of which color is positive, and which color is
negative. Your completed crossover cable should be pinned
electrically as shown below:

5. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram Figure 6 below.

The Model 1012B is now installed.

4.1.2 MODULAR TWISTED PAIR CONNECTION

The Model 1012B offers two interface options for twisted pair
connection: RJ-11 (6-wire) jack and RJ-45 (8-wire) jack. Pages 9 and
10 show signal/pin assignments for the jacks, as well as pin-outs for the
appropriate twisted pair cable topologies.

XMT + RCV+
XMT - RCV -

RCV - XMT ­RCV + XMT+

}

One Pair

}

One Pair

7

Figure 5. Stripping 0.25-inch of insulation from the twisted pairs

Figure 6. Wiring terminal block of Model 1012B

Signal/Pin Assignments

The 6-wire RJ-11 and 8-wire RJ-45 jack options for the Model
1012B are prewired for a standard TELCO wiring environment. Use the
guide below when ordering or constructing twisted pair cables.

RJ-11 SIGNAL RJ-45 SIGNAL

1 . . . . . .GND† 1 . . . . . . .N/C

2 . . . . . .RCV- 2 . . . . . .GND†

3 . . . . . .XMT+ 3 . . . . . . .RCV-

4 . . . . . .XMT- 4 . . . . . .XMT+

5 . . . . . .RCV+ 5 . . . . . . .XMT-

6 . . . . . .GND† 6 . . . . . .RCV+

7 . . . . . .GND†

8 . . . . . . .N/C

†

Connection to ground is optional

Crossover Cable Construction

Connection of a 4-wire twisted pair circuit between two or more
Model 1012Bs requires a crossover cable as shown in the figures on
the following page.

RJ-11

SIGNAL PIN# PIN# . . . . . . . . . . .SIGNAL

GND† 1 6 . . . . . . . . . . . . .GND†

RCV- 2 4 . . . . . . . . . . . . . .XMT-

XMT+ 3 5 . . . . . . . . . . . . .RCV+

XMT- 4 2 . . . . . . . . . . . . . .RCV-

RCV+ 5 3 . . . . . . . . . . . . .XMT+

GND† 6 1 . . . . . . . . . . . . .GND†

RJ-45

SIGNAL PIN# PIN# . . . . . . . . . . .SIGNAL

GND† 2 7 . . . . . . . . . . . . .GND†

RCV- 3 5 . . . . . . . . . . . . . .XMT-

XMT+ 4 6 . . . . . . . . . . . . .RCV+

XMT- 5 3 . . . . . . . . . . . . . .RCV-

RCV+ 6 4 . . . . . . . . . . . . .XMT+

GND† 7 2 . . . . . . . . . . . . .GND†

†

Connection to ground is optional

8

AT&T standard modular pin assignments

4.2 WIRING FOR MULTI-POINT CIRCUITS

The Model 1012B supports multi-point applications using either a

star or a daisy chain topology. Both topologies require special wiring.

Note: Refer to Section 3.2 for multi-point settings.

4.2.1 STAR TOPOLOGY

Using a star topology, you may connect several Model 1012Bs
together in a master/slave arrangement. Maximum distance between
the units will vary based upon the number of drops, data rate, wire
gauge, etc. Contact Patton Technical Support [phone];
http://www.patton.com; or, [e-mail] for specific
distance estimates.

Table 3 shows how to wire the two-pair cables properly for a Model
1012B star topology. Note that the ground connection is not needed.

9

1
2
3
4
5
6
7
8

1
2
3
4
5
6

HOST FIRST SLAVE SECOND SLAVE

XMT+ RCV+

RCV+

XMT- RCV-

RCV-

RCV+ XMT+

XMT+

RCV- XMT-

XMT-

Table 3. Star wiring for Model 1012B host and slaves

4.2.2 DAISY CHAIN TOPOLOGY

Using a daisy chain topology, you may connect several Model
1012Bs together in a master/slave arrangement. Maximum distance
between the units will vary based upon the number of drops, data rate,
wire gauge, etc. Contact Patton Technical Support at [phone];
http://www.patton.com; or, [e-mail] for specific
distance estimates.

Figure 6 shows how to wire the two-pair cables properly for a

Model 1012B’s daisy chain topology. Note that the ground connection is
not needed.

Optional Connection: Dual Modular Jacks

To facilitate daisy chaining, the Model 1012B is available in a
"DRJ11" (dual RJ-11) or "DRJ45" (dual RJ-45) version. These units have
two specially wired modular jacks for twisted pair connection. With the
dual modular units, you do not need to build cumbersome "Y" cables for
your daisy chain application. Simply use a crossover cable to go between
the host and the first slave (see Section 4.1.2 for crossover cable wiring
instructions), and straight through cables between the slaves.

4.3 CONNECTION TO THE RS-232 INTERFACE

Once you have properly configured the Model 1012B and
connected the twisted pair wires correctly, plug the Model 1012B
directly into the DB-25 port of the RS-232 device. After doing so,
remember to insert and tighten the two captive connector screws.

Note: If you must use a cable to connect the Model 1012B to the

RS-232 device, make sure it is a straight through cable of
the shortest possible length—we recommend 6 feet (1.8
meters) or less.

4.4 OPERATING THE MODEL 1012B

Once the Model 1012B is properly installed, it should operate
transparently—as if it were a standard cable connection. Operating power
is derived from the RS-232 data and control signals; there is no "ON/OFF"
switch. All data signals from the RS-232 interface are passed straight
through. Additionally, one control signal is passed in each direction.

10

HOST FIRST SLAVE OTHER SLAVE(S)

XMT+ RCV+ RCV+
XMT- RCV- RCV­RCV+ XMT+ XMT+
RCV- XMT- XMT-

Table 3. Daisy Chain Wiring for Model 1012B Host and Slaves

APPENDIX A

SPECIFICATIONS

Transmission Format: Asynchronous, full duplex, half duplex
Transmission Line: Two unconditioned twisted pair AWG 19–26
Interfaces: EIA RS-232, ITU/CCITT V.24
Data Rates: 0–38.4 kbps
Isolation: Minimum 1500 V RMS via custom

transformers

Surge Protection: 600W power dissipation at 1 mS
Factory Switch Setting: DCE (transmits from RS-232 on pin 3)
Control Signals: CTS follows RTS from the terminal (DTE);

DSR follows DTR from the terminal (DTE);
CD indicates reception of carrier

RTS/CTS Delay: Approximately 30 mS
Connectors: DB-25 male or female on RS-232 side; RJ-

11, RJ-45 or terminal block with strain relief
on line side

Power Supply: No external power required; uses power

from EIA data and control signals

Temperature Range: 0–60°C (32–140°F)
Altitude: 0–15,000 feet (0–4,500 meters)
Humidity: 5 to 95% non-condensing
Weight: 2 oz. (60 grams)
Dimensions: 3.54L x 2.09W x 0.79H in.

(90L x 53W x 20H mm)

11

Distance Table (miles)

Data Wire Gauge
Rate 19 24 26

1,200 to 38,400 6.0 4.0 2.5

APPENDIX B

RS-232C PIN CONFIGURATIONS

12

1- (FG) Frame Ground
2- (TD) Transmit Data To Model 1012B
3- (RD) Receive Data From Model 1012B
4- (RTS) Request to Send To Model 1012B
5- (CTS) Clear to Send From Model 1012B
6- (DSR) Data Set Ready From Model 1012B
7- (SG) Signal Ground
8- (CD) Carrier Detect From Model 1012B
9- External Power To Model 1012B

To Model 1012B Data Term. Ready (DTR) - 20

DIRECTION "DCE" STANDARD SETTING DIRECTION

1- (FG) Frame Ground
2- (TD) Transmit Data From Model 1012B
3- (RD) Receive Data To Model 1012B
4- (RTS) Request to Send From Model 1012B
5- (CTS) Clear to Send To Model 1012B
6- (DSR) Data Set Ready To Model 1012B
7- (SG) Signal Ground
8- (CD) Carrier Detect To Model 1012B
9- External Power To Model 1012B

From Model 1012B Data Term. Ready (DTR) - 20

DIRECTION "DTE" STANDARD SETTING DIRECTION

APPENDIX C

MODEL 1012B BLOCK DIAGRAM

13 14

Notes

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An ISO-9001

Certified Company

Dear Valued Customer,

Thank you for purchasing Patton Electronics products! We do

appreciate your business. I trust that you find this user manual helpful.

We manufacture one of the widest selections of data communications
products in the world including CSU/DSU's, network termination units,
powered and self-powered short range modems, fiber optic modems, interface
converters, baluns, electronic data switches, data-line surge protectors,
multiplexers, transceivers, hubs, print servers and much more. We produce
these products at our Gaithersburg, MD, USA, facility, and can custom
manufacture products for your unique needs.

We would like to hear from you. Please contact us in any of the
following ways to tell us how you like this product and how we can meet your
product needs today and in the future.

Web: http://www.patton.com

Sales E-mail: [e-mail]

Support E-mail: [e-mail]

Phone - Sales [phone]

Phone - Support [phone]

Fax: [phone]

Mail: Patton Electronics Company

7622 Rickenbacker Drive
Gaithersburg, MD 20879 USA

We are committed to a quality product at a quality price. Patton
Electronics is ISO 9001 certified. We meet and exceed the highest standards
in the industry (CE, UL, etc.).

It is our business to serve you. If you are not satisfied with any
aspect of this product or the service provided from Patton Electronics or its
distributors, please let us know.

Thank you.

Burton A.Patton
Vice President

P.S. Please tell us where you purchased this product:

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