Patton electronics 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

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

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