USER
MANUAL
MODEL 1015 and
1015S
DB-15 Async
Short Range Modem
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
Part# 07M1015-B
Doc# 024011UB
Revised 5/24/94
3.0 CONFIGURATION
4.0 INSTALLATION
The Model 1015 is designed to be easy to use. There are no
internal jumpers or configuration switches to set, so there is no need to
open the case to configure the unit (you may need to open the case for
wire connection—refer to section 4.0). However, in some models, you
may have to set the external DCE/DTE switch.
Once you have properly configured the DCE/DTE switch, you are
ready to connect the Model 1015 to your system. This section tells
you how to properly connect the Model 1015 to the twisted pair and
RS-232 interfaces, and how to operate the Model 1015.
The figure below shows both versions of the Model 1015. If your
model looks like Figure 1, follow the instructions in Section 3.1. If your
Model 1015 looks like Figure 2, your unit will always operate in DCE
mode. Follow the instructions in Section 4.0.
4.1 CONNECTION TO THE TWISTED PAIR INTERFACE
The Model 1015 supports data-only communication between two
RS-232 devices at distances to 17 miles and data rates to 19.2 Kbps.
There are two essential requirements for installing the Model 1015:
1. These units work in pairs. Therefore, you must have one Model
1015 at each end of a two twisted pair interface.
Terminal
Block
2. To function properly, the Model 1015 needs two twisted pairs of
metallic wire. The pairs must be unconditioned, dry metallic wire,
between 19 and 26 AWG (the higher number gauges may limit
distance). Standard dial-up telephone circuits, or leased circuits
that run through signal equalization equipment are not acceptable.
DCE/DTE
Switch
Terminal
Block
For your convenience, the Model 1015 is available with three dif-
ferent twisted pair interfaces: RJ-11 jack, RJ-45 jack and terminal
blocks with strain relief.
Figure 1
Figure 2
4.1.1 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
3.1 SETTING THE DCE/DTE SWITCH
The RJ-11 and RJ-45 connectors on the Model 1015’s twisted pair
interface are pre-wired for a standard TELCO wiring environment (see
Figure 3). The table on the following page shows the signal/pin rela-
tionships:
If your Model 1015 looks like Figure 1, it comes equipped with an
external DCE/DTE switch and requires special attention. If the device
connected to the Model 1015 is a modem or multiplexer (or is wired
like one), move the switch to “DTE”. This causes the Model 1015 to
behave like Data Terminal Equipment and transmit data on pin 1.
1 - Blue
1 - Blue
2 - Orange
3 - Black
4 - Red
2 - Yellow
3 - Green
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
5 - Black
6 - White
DCE
DTE
Figure 3. AT&T standard modular color codes
If the device connected to the Model 1015 is a PC, terminal or
host computer (or is wired like one), move the switch to “DCE”. This
setting causes the Model 1015 to behave like Data Communications
Equipment and transmit data on pin 9.
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4
1. Open the unit by gently inserting a screwdriver between the
DB-15 connector and the lip of the plastic case (see below). You don’t
have to worry about breaking the plastic, but be careful not to bend the
D-sub connector.
RJ-11
SIGNAL
RJ-45
SIGNAL
1----------------GND†
2----------------RCV-
3----------------XMT+
4----------------XMT-
5----------------RCV+
6----------------GND†
1----------------N/C
2----------------GND†
3----------------RCV-
4----------------XMT+
5----------------XMT-
6----------------RCV+
7----------------GND†
8----------------N/C
When connecting two Model 1015s, it is necessary to use a
“cross-over” cable. The diagram below shows how a crossover cable
should be constructed for an environment where both Model 1015s use
a
4-wire RJ-11 connector. Similar logic should be followed when
using RJ-45 connectors or a combination of the two.
SIGNAL PIN# COLOR‡
COLOR
PIN# SIGNAL
GND†
RCV-
XMT+
XMT-
RCV+
GND†
1
2
3
4
5
6
Blue --------------------White
6
4
5
2
3
1
GND†
XMT-
RCV+
RCV-
XMT+
GND†
Yellow------------------Red
Green ------------------Black
Red---------------------Yellow
Black -------------------Green
White-------------------Blue
Once the unit has been opened, you will be able to see the termi-
nal blocks located at the rear of the PC board.
†Connection to ground is optional
‡Standard color codes—yours may be different
2. Strip the outer insulation from the twisted pairs about one inch
from the end.
4.1.2 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
If your RS-232 application requires you to connect two pairs of
bare wires to the Model 1015, you will need to open the case to access
the terminal blocks. The following instructions will tell you how to open
the case, connect the bare wires to the terminal blocks, and fasten the
strain relief collar in place so that the wires won’t pull loose.
3. Strip the insulation on each of the twisted pair wires about .25”.
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4. 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.
8. Place the 2 halves of the strain relief assembly on either side
of the telephone wire and press together very lightly. Slide the assem-
bly so that it is about 2 inches from the terminal posts and press
together firmly. If your cable diameter is too small or too large for our
strain relief, please contact our technical support. We have strain relief
assemblies to accommodate most cable diameters.
5. 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.
Ultimately, you will want to construct a two pair crossover cable
that makes a connection with the RS-232 device as shown below:
V +
XMT +
XMT -
G
RCV -
RCV +
RCV+
RCV -
G
XMT -
XMT +
One Pair
One Pair
}
}
To Shield (Optional)
6. If there is a shield around the telephone cable, it may be con-
nected to “G” on the terminal block. To avoid ground loops, we recom-
mend connecting the shield at the computer end only. A ground wire is
not necessary for proper operation of the Model 1015.
9. Insert the strain relief assembly with the wire going through it
into the slot in the bottom half of the modem case and set it into the
recess in the case.
7. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
V +
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APPENDIX A
10. TIP the top half of the case as necessary to place it over the
strain relief assembly. Do not snap the case together yet.
PATTON MOCEL 1015 SPECIFICATIONS
Transmission Format: Asynchronous
Data Rate:
0 to 19,200 bps (no strapping)
Surge Protection:
600W peak power dissipation at 1 mS
(10 x 1000 µs exponential waveform) and
response time of 1.0 pS
Control Signal:
CTS (Pin 10) turns ON immediately after
the terminal raises RTS (Pin 2); DSR (Pin 3)
turns on when powered up; DCD (Pin 12)
turns on immediately after the terminal
raises DTR (Pin 4)
11. Insert one captive screw through a saddle washer and then
insert the entire piece through the hole in the DB-15 end of the case.
Snap that side of the case closed. Repeat the process for the other
side. This completes cable installation.
Transmit Line:
Transmit Mode:
Transmit Level:
Line Connection:
4 wire, unconditioned line (2 twisted pairs)
4.2 CONNECTION TO THE RS-232 INTERFACE
Full duplex, 4-wire
0 dBm
Once you have configured the Model 1015 for DTE or DCE and
connected the twisted pair wires correctly, simply plug the 1015 directly
into the DB-15 port of the RS-232 device. After doing so, remember to
insert and tighten the two captive connector screws.
RJ-11 or RJ-45 jack or 5 screw terminal
posts (4 wires and 1 ground) and a strain
relief insert
Note: If you must use a cable to connect the Model 1015 to the
RS-232, make sure it is a straight through cable of the shortest possi-
ble length—we recommend 6 feet or less. The Model 1015 requires a
cable that incorporates pins 1, 2, 3, 4, 9, 10, 11 and 12.
Power Supply:
No external power required, uses ultra low
power from EIA data and control signals
Size:
2.6” x 1.3” x 0.75”
4.3 OPERATING THE MODEL 1015
Once the Model 1015 is properly installed, it should operate trans-
parently—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. All control signals from the RS-232 interface
are looped back.
Note: If your system requires hardware flow control, you will need
the Patton Model 1012 or Model 1060 Short Range Modem. Call
Patton Customer Service at (301) 975-1007 for more information.
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APPENDIX B
BLOCK DIAGRAM
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