USER
MANUAL
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
Part# 07M1004-C
Doc# 047011UC
Revised 8/10/95
MODEL 1004
and 1004S
High Speed,
Multipoint Short
Range Modem
1.0 WARRANTY INFORMATION
Patton Electronics warrants all Model 1004 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 1004 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 1004 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 1004 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 1004. Technical Service hours: 8AM to 5PM EST, Monday
through Friday.
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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
• Operates asynchronously, point to point or multipoint
• Up to 50 multipoint device drops in a polling environment
• Data rates to 115.2 Kbps
• Passes transmit & receive data, one control signal each direction
• DCE/DTE switch selectable on RS-232 interface
• No AC power or batteries are required
• Variable high/low impedancesettings
• Carrier can be set as “constantly on” or “controlled by RTS”
2.2 DESCRIPTION
The Model 1004 High Speed, Multipoint Short Range Modem
provides exceptional versatility in a compact package. Requiring no
AC power or batteries for operation, the Model 1004 supports asynchronous RS-232 data rates to 115.2 Kbps over one or two unconditioned twisted pair. Distances up to 9.4 miles are attainable at lower
data rates (19.2 Kbps, 19 AWG twisted pair).
The Model 1004 can handle up to 50 terminal drops in a multipoint
polling environment. For RS-485 and serial printer applications requiring hardware handshaking, the Model 1004 passes one control signal
in each direction. The Model 1004 may be configured for high or low
impedance operation, and carrier may be set to “constantly on” or
“controlled by RTS”.
Options for twisted pair connection include terminal blocks with
strain relief, RJ-11, RJ-45 and dual modular connectors for daisy chaining. The surge protected Model 1004S incorporates Silicon Avalanche
Diodes which provide 600 watts per wire of protection against harmful
data line transient surges.
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3.0 CONFIGURATION
The Model 1004 is configured using six PC board mounted switches. Figure 1 shows the switch locations, along with the location of the
terminal blocks and optional surge protectors:
3.1 SETTING THE DCE/DTE SWITCH
For your convenience, the Model 1004 has an externally accessible DCE/DTE switch (Figure 2). If the device connected to the Model
1004 is a modem or multiplexer (or is wired like one), set the switch to
“DTE”. This setting causes the Model 1004 to behave like Data
Terminal Equipment and transmit data on pin 2.
If the device connected to the Model 1004 is a PC, terminal or
host computer (or is wired like one), set the switch to “DCE”. This setting causes the Model 1004 to behave like Data Communications
Equipment and transmit data on pin 3.
3
DCE/DTE
Switch
2-Wire/4-Wire
Switch
Surge
Suppressors
(1004S only)
Terminal
Block
Control
Switches
Figure 1. Model 1004 board, showing switch locations
Figure 2. Close up of the external DCE/DTE switch
3.2 ACCESSING THE CONFIGURATION SWITCHES
The five switches shown in Figure 3 configure the Model 1004 for
RTS/CTS delay, echo, method of carrier control, impedance and
2-wire/4-wire operation. These switches are located
internally
on the
Model 1004's PC board. To access switch set 1 (SW1) and switch set
2 (SW2), use a small flat blade screwdriver to pop open the Model
1004's case as shown in Figure 4.
4
“ON”
“OFF”
SW2SW1
Figure 3. Close up of switches SW1 and SW2 on the PC board
Figure 4. Opening the Model 1004's plastic case with a small screwdriver
123
4
DCE DTE
3.2.1 SWITCH SETTINGS
All possible settings for the Model 1004’s configuration switches
are presented in the summary table below. If you have additional
questions, contact Technical Support at (301) 975-1000.
SW 1-1: RTS/CTS Delay
The setting for Switch SW1-1 determines the amount of delay
between the time the Model 1004 “sees” RTS and when it sends CTS.
(This option is available in DCE mode only).
SW1-1
Setting
Off 0mS
On 8mS
SW 1-2: Echo Enable
Switch SW1-2 determines whether the Model 1004 echoes data
back to the transmitting device. (Half duplex modes only).
SW1-2
Setting
Off Echo Off
On Echo On
SW 1-3: Carrier Control Method
Switch SW1-3 determines whether the carrier is “constantly on” or
“controlled by RTS”. This setting allows for operation in switched carrier, multipoint and/or hardware handshaking applications.
SW1-3 Setting
Off Constantly “on”
On Controlled by RTS
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SWITCH SUMMARY TABLE
Position Function Off Position On Position
SW1-1 RTS/CTS Delay 0mS 8mS
SW1-2 Echo Enable Echo “Off” Echo “On”
SW1-3 Carrier Control Constantly “On” Controlled by RTS
SW1-4 Impedance High (120K Ohm) Low (120 Ohm)
SW2 2 wire/4 wire 2-wire 4-wire
SW 1-4: Impedance
Switch SW1-4 defines a termination resistance. The Model 1004’s
generator can drive 50 unit loads including two termination resistances
of 120 Ohms each.
SW1-4 Setting
Off High (120K Ohm)
On Low (120 Ohm)
SW 2: 2-Wire/4-Wire
Switch SW1-4 determines whether the Model 1004 will operate in
either 2-wire or 4-wire mode.
SW1-4 Setting
Off 2-wire
On 4-wire
3.2.2 CONFIGURATION SWITCH APPLICATIONS
The table below shows you how to set the Model 1004's configuration switches to fit several common applications. If you have any
questions, call Patton Technical Support at (301) 975-1007.
*NOTE: RTS/CTS Delay setting should be based upon transmission timing.
6
SW1-1: RTS/CTS* ON ON ON ON ON
SW1-2: Echo OFF ON OFF ON OFF
SW1-3: Carrier OFF ON ON Master-OFF ON
Slaves-ON
SW1-4: Impedance ON ON ON Master - ON
Slaves - HIGH
Last Slave - ON
SW2: 2-wire/4-wire ON ON OFF ON OFF
TYPICAL SWITCH APPLICATIONS
Point-to-Point
Switch
Settings
Multi-point
4W 2W 4W 2W4W HDX
4.0 INSTALLATION
Once the Model 1004 is properly configured, it is ready to connect
to your system. This section tells you how to properly connect the
Model 1004 to the twisted pair and RS-232 interfaces, and how to
operate the Model 1004.
4.1 TWISTED PAIR CONNECTION
The Model 1004 supports data-only communication between two
RS-232 devices at distances to 9.4 miles and data rates to 115.2 Kbps.
There are two essential requirements for installing the Model 1004:
1. These units work in
pairs.
Therefore, you must have one Model
1004 at each end of a two twisted pair interface. In multipoint
environments, there must be one Model 1004 at the RS-232 host
and one at each RS-232 terminal.
2. To function properly, the Model 1004 needs two twisted pairs of
metallic wire. These 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
.
For your convenience, the Model 1004 is available with several
different twisted pair interfaces: RJ-11 jack, RJ-45 jack, terminal
blocks with strain relief and dual modular jacks (for multipoint daisychaining).
4.1.1 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
If your application requires you to connect one or two pairs of bare
wires to the Model 1004, 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 the wires won't pull loose.
1. You should already have the case open for the configuration
procedure. If not, see Section 3.2.
2. Strip the outer insulation from the twisted pair(s) about one
inch from the end.
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3. Strip the insulation on each of the twisted pair wires about .25”.
4. In a two pair circuit, 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.
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 two Model 1004s as shown below.
6. In a single pair circuit, use
only the transmit (XMT) pair
as
shown below:
7. If there is a shield around the telephone cable, it may be connected to “G” on the terminal block. To avoid ground loops, we recommend connecting the shield at the computer end only. A ground wire is
not necessary
for proper operation of the Model 1004.
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XMT+--------------------------------------------------RCV+
XMT- --------------------------------------------------RCVG ---------------------- G
RCV+--------------------------------------------------XMT+
RCV- --------------------------------------------------XMT-
To Shield (Optional)
}
One Pair
}
One Pair
XMT+--------------------------------------------------XMT+
XMT- --------------------------------------------------XMT-
8. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
9. Place the 2 halves of the strain relief assembly on either side
of the telephone wire and press together very lightly. Slide the assembly 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.
+RCV- G -XMT+
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10. Insert the strain relief assembly and wire into the slot in the
bottom half of the modem case. Set it into the recess in the case.
11. BEND the top half of the case as necessary to place it over
the strain relief assembly. Do not snap the case together yet.
12. Insert one captive screw through a saddle washer. Then
insert the entire piece through the hole in the DB-25 end of the case.
Snap that side of the case closed. Repeat the process for the other
side. This completes cable installation.
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+RCV- G -XMT+
RJ-45 Cable (4-Wire)
SIGNAL PIN# PIN# SIGNAL
GND
†
2-----------------------7 GND
†
RCV- 3-----------------------5 XMTXMT+ 4-----------------------6 RCV+
XMT- 5-----------------------3 RCVRCV+ 6-----------------------4 XMT+
GND
†
7-----------------------2 GND
†
RJ-11 Cable (2-Wire)
SIGNAL PIN# PIN# SIGNAL
XMT+ 3-----------------------3 XMT+
XMT- 4 -----------------------4 XMT-
RJ-45 Cable (2-W
ire)
SIGNAL PIN# PIN# SIGNAL
XMT+ 4-----------------------4 XMT+
XMT- 5 -----------------------5 XMT-
†
Connection to ground is optional
4.2 WIRING FOR MULTIPOINT CIRCUITS
The Model 1004 supports multi-point applications using either a
star or daisy chain topology. Both topologies require special wiring, as
well as specific DIP switch settings for master and slave units. Note:
Refer to Section 3.2.2 for multipoint DIP switch settings.
4.2.1 STAR TOPOLOGY
Using a star topology, you may connect several Model 1004s
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.
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4.1.2 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
The RJ-11 and RJ-45 connectors on the Model 1004’s twisted pair
interface are pre-wired for a standard TELCO wiring environment. The
signal/pin relationships are shown below:
RJ-11 SIGNAL RJ-45 SIGNAL
1...................GND
†
1...................N/C
2...................RCV- 2...................GND
3...................XMT+ 3...................RCV-
4...................XMT- 4...................XMT+
5...................RCV+ 5...................XMT-
6...................GND 6...................RCV+
7...................GND
8...................N/C
†
Connection to ground is optional
AT&T standard modular color codes
When connecting two Model 1004’s, it is necessary to use a
crossover cable. The diagrams below show how a crossover cable
should be constructed for the following environments: 4-wire RJ-11,
4-wire RJ-45, 2-wire RJ-11 or 2-wire RJ-45.
RJ-11 Cable (4-Wire)
SIGNAL PIN# PIN# SIGNAL
GND
†
1-----------------------6 GND
†
RCV- 2-----------------------4 XMTXMT+ 3-----------------------5 RCV+
XMT- 4-----------------------2 RCVRCV+ 5-----------------------3 XMT+
GND
†
6-----------------------1 GND
†
†
Connection to ground is optional
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1
2
3
4
5
6
7
8
1
2
3
4
5
6
Figure 4 shows how to wire the two-pair cables properly for a
Model 1004 star topology. Note that the ground connection is not
needed.
4.2.2 DAISY CHAIN TOPOLOGY
Using a daisy chain topology, you may connect several Model
1004s 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.
Figure 5 shows how to wire the two-pair cables properly for a
Model 1004 daisy chain topology. Note that the ground connection is
not needed.
Optional Connection: Dual Modular Jacks
To facilitate daisy chaining, the Model 1004 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.
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HOST FIRST SLAVE SECOND SLAVE
XMT+ RCV+
RCV+
XMT- RCV-
RCV-
RCV+ XMT+
XMT+
RCV- XMT-
XMT-
Figure 4. Star wiring for Model 1004 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 1004 host and slaves
With the dual modular units, you won't 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.
4.3 CONNECTION TO THE RS-232 INTERFACE
Once you have properly configured the Model 1004 and connected the twisted pair wires correctly, simply plug the Model 1004 directly
into the DB-25 port of the RS-232 device. Remember to insert and
tighten the two captive connector screws.
(Note: If you must use a cable to connect the Model 1004 to the
RS-232 device, make sure it is a
straight through
cable of the shortest
possible length—we recommend 6 feet or less).
4.4 OPERATING THE MODEL 1004
Once the Model 1004 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 and RS-485 interfaces are passed straight through. Additionally, one hardware flow
control signal is passed
in each direction
.
14
APPENDIX A
SPECIFICATIONS
Transmission Format: Asynchronous
Data Rate: Up to 115,200 bps
Transmit Line: 2, 4 wire unconditioned twisted pair
Transmit Mode: Full or half duplex
Transmit Level: 0 dBm
Range: Up to 9 miles
Control Signals: In DCE mode, DSR turns “ON” immediately after the
terminal raises DTR; DCD turns “ON” after recogniz
ing the receive signal from the line; CTS turns on
after the terminal raises RTS
Carrier: The carrier is switch selected either continuous operation or
switched operation, controlled by RTS
Surge Protection: 600W power dissipation at 1 mS and response
time less than 1.0 pS
Power: No external power required, uses ultra low power from EIA
data and control signals
Size: 2.66” x 2.10” x 0.73”
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APPENDIX B
RS-232 PIN CONFIGURATIONS
1- (FG) Frame Ground
2- (TD) Transmit Data To Model 1004
3- (RD) Receive Data From Model 1004
4- (RTS) Request to Send To Model 1004
5- (CTS) Clear to Send From Model 1004
6- (DSR) Data Set Ready From Model 1004
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect From Model 1004
To Model 1004 Data Term. Ready (DTR) - 20
DIRECTION “DCE” SETTING DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data From Model 1004
3- (RD) Receive Data To Model 1004
4- (RTS) Request to Send From Model 1004
5- (CTS) Clear to Send To Model 1004
6- (DSR) Data Set Ready To Model 1004
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect To Model 1004
From Model 1004 Data Term. Ready (DTR) - 20
DIRECTION “DTE” SETTING DIRECTION
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APPENDIX C
BLOCK DIAGRAM
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