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MANUAL
MODEL 1012B
Asynchronous
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Carrier Controlled Short
Range Modem
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SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
Part# 07M1012B Rev. A
Doc# 040061U
Revised 10/28/03
Copyright © 2003
Patton Electronics Company
All rights reserved.
An ISO-9001
Certified Company
3.0 CONFIGURATION
To change the DTE/DCE setting, do the following:
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.
1. Using a small screwdriver, insert the tip into one of the slots in
the side of the Model 1012B (see Figure 2).
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.
Figure 2. Using a small screwdriver to open the Model 1012B case
2. Rotate the screwdriver as shown in Figure 2 to open the case.
DCE
DTE
Figure 3. SW1 DTE/DCE switch
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 1. Model 1012B Board, showing switch and strap locations
3
4
3.2 SETTING THE RTS/CD CARRIER CONTROL JUMPER
4.0 INSTALLATION
The RTS/CD jumper (see Figure 1) is identified as J2 inside the
1012B (see Figure 1). To access this strap, do the following:
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.
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.
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.
DTE/DCE Switch Setting
DCE (Default)
DTE
RTS/CD jumper in place
(default)
Carrier activated by
RTS - pin 4 (default)
Carrier activated by
CD - pin 8
1. These units work in pairs. Therefore, you must have one Model
1012B at each end of a two twisted pair interfaces.
RTS/CD jumper removed
Carrier constantly ON
Carrier constantly ON
Table 1. Interaction of DTE/DCE switch and RTS/CD strap
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.
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.
For your convenience, the Model 1012B is available with the
following twisted pair interfaces: RJ-11 jack, RJ-45 jack, and terminal
blocks.
DTE/DCE Switch Setting
DCE
DTE
4.1.1 TERMINAL BLOCK TWISTED PAIR CONNECTION
Carrier Detect Function
Carrier detect is output
on pin 8 (CD)
Carrier detect is output
on pin 4 (RTS)
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.
Table 2. Interaction of DTE/DCE switch and RTS/CD jumper
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.
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.
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.
Figure 4. Stripping the outer insulation from the twisted pairs
5
6
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.
Figure 5. Stripping 0.25-inch of 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.
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
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:
XMT +
XMT -
RCV+
RCV -
One Pair
}
}
†Connection to ground is optional
RCV -
RCV +
XMT -
XMT+
One Pair
Crossover Cable Construction
5. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram Figure 6 below.
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†
RCV-
XMT+
XMT-
RCV+
GND†
1
2
3
4
5
6
6 . . . . . . . . . . . . .GND†
4 . . . . . . . . . . . . . .XMT-
5 . . . . . . . . . . . . .RCV+
2 . . . . . . . . . . . . . .RCV-
3 . . . . . . . . . . . . .XMT+
1 . . . . . . . . . . . . .GND†
Figure 6. Wiring terminal block of Model 1012B
RJ-45
SIGNAL PIN# PIN# . . . . . . . . . . .SIGNAL
The Model 1012B is now installed.
GND†
RCV-
XMT+
XMT-
RCV+
GND†
2
3
4
5
6
7
7 . . . . . . . . . . . . .GND†
5 . . . . . . . . . . . . . .XMT-
6 . . . . . . . . . . . . .RCV+
3 . . . . . . . . . . . . . .RCV-
4 . . . . . . . . . . . . .XMT+
2 . . . . . . . . . . . . .GND†
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.
†Connection to ground is optional
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8
4.2.2 DAISY CHAIN TOPOLOGY
1
2
3
4
5
6
7
8
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 (301) 975-1007;
distance estimates.
1
2
3
4
5
6
Figure 6 shows how to wire the two-pair cables properly for a
AT&T standard modular pin assignments
HOST
FIRST SLAVE
OTHER SLAVE(S)
4.2 WIRING FOR MULTI-POINT CIRCUITS
XMT+
XMT-
RCV+
RCV-
RCV+
RCV-
XMT+
XMT-
RCV+
RCV-
XMT+
XMT-
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.
Table 3. Daisy Chain Wiring for Model 1012B Host and Slaves
Model 1012B’s daisy chain topology. Note that the ground connection is
not needed.
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 (301) 975-1007;
distance estimates.
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.
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.
HOST
FIRST SLAVE
SECOND SLAVE
RCV+
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.
XMT+
RCV+
XMT-
RCV+
RCV-
RCV-
XMT+
XMT-
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.
RCV-
XMT+
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.
XMT-
Table 3. Star wiring for Model 1012B host and slaves
9
10
APPENDIX A
SPECIFICATIONS
APPENDIX B
RS-232C PIN CONFIGURATIONS
Transmission Format: Asynchronous, full duplex, half duplex
DIRECTION
"DCE" STANDARD SETTING
DIRECTION
Transmission Line:
Interfaces:
Data Rates:
Isolation:
Two unconditioned twisted pair AWG 19–26
EIA RS-232, ITU/CCITT V.24
0–38.4 kbps
Minimum 1500 V RMS via custom
transformers
1- (FG) Frame Ground
2- (TD) Transmit Data
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
To Model 1012B
From Model 1012B
To Model 1012B
Surge Protection:
600W power dissipation at 1 mS
From Model 1012B
From Model 1012B
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
Approximately 30 mS
DB-25 male or female on RS-232 side; RJ-
11, RJ-45 or terminal block with strain relief
on line side
To Model 1012B
Data Term. Ready (DTR) - 20
8- (CD) Carrier Detect
9- External Power
From Model 1012B
To Model 1012B
RTS/CTS Delay:
Connectors:
Power Supply:
No external power required; uses power
from EIA data and control signals
0–60°C (32–140°F)
0–15,000 feet (0–4,500 meters)
5 to 95% non-condensing
Temperature Range:
Altitude:
Humidity:
DIRECTION
"DTE" STANDARD SETTING
DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (CD) Carrier Detect
9- External Power
From Model 1012B
To Model 1012B
From Model 1012B
To Model 1012B
To Model 1012B
Weight:
Dimensions:
2 oz. (60 grams)
3.54L x 2.09W x 0.79H in.
(90L x 53W x 20H mm)
Distance Table (miles)
Wire Gauge
From Model 1012B Data Term. Ready (DTR) - 20
To Model 1012B
To Model 1012B
Data
Rate
19
24
26
1,200 to 38,400 6.0
4.0
2.5
11
12
APPENDIX C
Notes
MODEL 1012B BLOCK DIAGRAM
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