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.

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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.

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

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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

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Figure 3. SW1 DTE/DCE switch

DCE

DTE