USER
MANUAL
MODEL 1012AR
Asynchronous, Carrier
Controlled Short Range
Modem
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com
Part# 07M1012AR-A
Doc# 040051UA
Revised 11/22/94
1.0 WARRANTY INFORMATION
Patton Electronics warrants all Model 1012AR 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 1012AR 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 1012AR 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 1012AR
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).
1.2 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 Service at (301) 975-1007.
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 1012AR. Technical Service hours: 8AM to 5PM EST, Monday
through Friday.
1
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
• Allows up to 10 terminals to use a single port
• Supports hardware handshaking
• Full or half duplex, point-to-point or multipoint
• Automatic equalization and gain control
• Transformer isolation
• No AC power required. Draws required low power from
TIA-561 interface
• Supports data rates to 38,400 bps, distances to 6 miles
• Silicon Avalanche Diode surge protection - Standard
• TIA-561 connection via 10-pin RJ-45 jack
• Line connection via RJ-11 or 8-pin RJ-45 jack
2.2 DESCRIPTION
The Patton Model 1012AR asynchronous short range modem was
designed for point-to-point or multidrop applications requiring hardware
handshaking. In a multipoint environment, the master transmits data
simultaneously to up to 10 addressable terminals. The terminals contend for the main channel by activating RTS (pin 4). Automatic equalization and gain control ensure the accuracy of transmitted data.
Built-in transformers eliminate much of the noise which can occur
in commercial buildings. These transformers also eliminate ground
loops caused by differences in reference ground. Consequently, the
Model 1012AR may be used to extend RS-232 (TIA-561) distances in
environments where connected equipment is located in different buildings.
The 1012AR uses the latest in bi-directional, clamping, transient
suppressors to protect itself and connected equipment against harmful
transient surges. These suppressors can dissipate 600W per wire at
1.0 mS. Response times are typically 1.0 pS from 0 to the nominal
breakdown level of 6.8 volts.
2
3.0 CONFIGURATION
The Model 1012AR is pre-configured at the factory to work in multipoint applications, and in point-to-point applications that use hardware
flow control. These are the vast majority of applications that call for
the Model 1012AR. Therefore, you will normally have no need to re-
configure the Model 1012AR: it will be strictly “plug-and-play”.
The only user-modifiable setting on the Model 1012AR is the RTS
control strap. The RTS control strap setting determines how its transmitter (i.e. carrier) is activated. When the RST control strap is ON
(installed on the pins), the transmitter is enabled by activating RTS
(RJ-45 pin 8). This is the
factory setting
.. When its strap is OFF
(removed from the pins), the 1012AR’s transmitter is constantly on. If
your application requires the transmitter to be constantly on (i.e. hardware flow control disabled), follow the instructions below:
Step 1: Opening the Case. To open the Model 1012AR’s case,
insert the blade of a small flat-head screw driver into the narrow slots
on either side of the case and twist. The two case halves should pop
apart. Then slide the case halves off of the two end inserts. This will
expose the PC board.
Step 2: Setting the RTS Strap. On Figure 1 (below), you will
see the location of the RTS strap on the PC board. To re-configure the
Model 1012AR for transmitter constantly on, remove the strap by
pulling it out with a pair of needle-nose pliers or tweezers. Be sure not
to lose the strap.
Step 3: Closing the Case. To close the Model 1012AR’s case,
be sure the end inserts are in place around th modular jacks
(“side”side closest to the clip) and slide th case halves down around
them. Then snap the case halves shut.
4.0 INSTALLATION
The Model 1012AR features modular connectors on both the
EIA/TIA-561 and 4-wire (line) sides. The EIA/TIA-561 interface is
always a
10 pin
RJ-45 jack (although its physical size is identical to an
8-pin RJ-45 jack). A one foot RJ-45 patch cable, wired straight
through, is supplied with the unit. The 4-wire interface may be a 6 pin
RJ-11 jack or an
8 pin
RJ-45 jack.
4.1 CONNECTION TO THE EIA/TIA-561 INTERFACE
The Model 1012AR features a convenient, 10 pin RJ-45 jack for
interface with your DTE device. This jack is wired as a DCE accord-
ing to the EIA/TIA-561 specification. Figure 2 (below) shows the
pins and signals for the modular EIA/TIA-561 interface. Note: Signal
are
named
from the perspective of the DTE (PC/terminal). Therefore,
even though pin 7 (below) is called “TD” , the signal is actually
incom-
ing
to the DCE (Model 1012AR).
10 Pin RJ-45 (DCE) SIGNAL DIRECTION
1 ----------------------N/C
2 ----------------------RI Not Supported
3 ----------------------CD From 1012AR
4 ----------------------DTR To 1012AR
5 ----------------------SG No Direction
6 ----------------------RD From 1012AR
7 ----------------------TD To 1012AR
8 ----------------------CTS From 1012AR
9 ----------------------RTS To 1012AR
10 ----------------------N/C
.
Figure 2. Pin-outs for the Model 1012AR’s modular EIA/TIA-561 interface jack
If you wish to use the Model 1012AR with a DTE device that is
equipped with a DB-25 RS-232 port, you will need to construct a
patch cable according to the diagram shown in Figure 3 (below).
SIGNAL
10 Pin RJ-45 (DCE) DB-25 (DTE) SIGNAL
CD 3 ------------------------------8 CD
DTR 4 ------------------------------20 DTR
SG 5 ------------------------------7 SG
RD 6 ------------------------------3 RD
TD 7 ------------------------------2 TD
CTS 8 ------------------------------5 CTS
RTS 9 ------------------------------9 RTS
Figure 3. Pin connections for an EIA/TIA-561(RJ-45) to RS-232 (DB-25) patch cable.
3 4
Surge
Suppressors
Isolation
Transformers
RTS/CTS
Strap
Figure 1. Model 1012AR board, showing the RTS strap location
4.2 CONNECTION TO THE 4-WIRE INTERFACE
The Model 1012AR offers RJ-11 and RJ-45 options for connection
of the 4-wire data line. The signals/pins used are shown below:
RJ-1
1 SIGNAL RJ-45 SIGNAL
1 ------------GND
†
1 -----------N/C
2 ------------RCV- 2 -----------GND
3 ------------XMT+ 3 -----------RCV4 ------------XMT- 4 -----------XMT+
5 ------------RCV+ 5 -----------XMT6 ------------GND 6 -----------RCV+
7 -----------GND
8 -----------N/C
†
Connection to ground is optional
4.2.1 POINT-TO-POINT CONNECTION
When installing two Model 1012AR units in a point-to-point appli-
cation, the cable between them should be a
crossover
cable, as shown
in the following chart. The color/pin number correlations below correspond to AT&T’s wiring standard for RJ-11 connectors.
SIGNAL
PIN# COLOR COLOR PIN# SIGNAL
GND†1 Blue‡--------------White 6 GND
RCV- 2 Yellow------------Red 4 XMTXMT+ 3 Green------------Black 5 RCV+
XMT- 4 Red ---------------Yellow 2 RCVRCV+ 5 Black-------------Green 3 XMT+
GND 6 White-------------Blue 1 GND
†
Connection to ground is optional
‡
Standard color codes—yours may be different
4.3 MULTIPOINT CONNECTION
The Model 1012AR supports multi-point applications using either
a star or a daisy chain topology. together in a master/slave arrangement. Maximum distance between the units will vary based upon the
number of drops, data rate, wire gauge, etc. Call Technical Support for
specific distance estimates. In both topologies, the master unit should
be set to “transmitter constantly on” (strap removed), and the slaves
should be set to “transmitter controlled by RTS” (strap in place).
4.3.1 STAR TOPOLOGY
Figure 4 (below) shows how to wire the two-pair cables properly
for a Model 1012AR star topology. Note that the ground connection is
not needed
4.3.2 DAISY CHAIN TOPOLOGY
Figure 5 (below) shows how to wire the two-pair cables properly
for a Model 1012AR daisy-chain topology. Note that the ground connection is not needed.
5 6
1 - Blue
2 - Orange
3 - Black
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
1 - Blue
2 - Yellow
3 - Green
4 - Red
5 - Black
6 - White
HOST FIRST SLAVE SECOND SLAVE
XMT+ RCV+
RCV+
XMT- RCV-
RCV-
RCV+ XMT+
XMT+
RCV- XMT-
XMT-
Figure 4. Star wiring for Model 1012AR host and slaves
HOST FIRST SLAVE OTHER SLAVE(S)
XMT+ RCV+ RCV+
XMT- RCV- RCVRCV+ XMT+ XMT+
RCV- XMT- XMT-
Figure 5. Daisy chain wiring for Model 1012AR host and slaves
APPENDIX A
PAT TON MODEL 1012AR SPECIFICATIONS
Transmission Format: Asynchronous, full duplex
Transmission Line: Two unconditioned twisted pair 19-26 AWG
Interface: EIA/TIA 561
Data Rates: 0 - 38.4 Kbps
Isolation: Minimum 1500 V RMS via custom
transformers
Surge Protection: 600W power dissipation at 1 mS and
response time of 1 pS
Control Signals: CTS follows RTS from the terminal (DTE);
DSR follows DTR from the terminal (DTE);
DCD indicates reception of carrier
RTS/CTS Delay: Approximately 35 mS
Connectors: 10 Pin RJ-45 on EIA/TIA-561 side; RJ-11
or 8 pin RJ-45 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
Humidity: 5 to 95% noncondensing
Weight: 2 oz.
Dimensions: 2.66” x 2.10” x 0.73”
Copyright ©
Patton Electronics Company
All Rights Reserved
APPENDIX B
PAT TON MODEL 1012AR BLOCK DIAGRAM
7 8
Distance Table (miles)
Data Wire Gauge
Rate 19 24 26
38,400 6.0 4.0 2.5
19,200 6.0 4.0 2.5
9,600 6.0 4.0 2.5
4,800 6.0 4.0 2.5
2,400 6.0 4.0 2.5
1,200 6.0 4.0 2.5
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