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USER
MANUAL
MODEL 2017RC
Miniature RS-232 to 20mA
Current Loop Converter:
Dual Port Rack Mount Card
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com
Part# 07M2017RC-B
Doc# 073062U, Rev. C
Revised 1/22/08
CERTIFIED
An ISO-9001
Certified Company
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1.2 CE NOTICE
The CE symbol on your Patton Electronics equipment indicates
that it is in compliance with the Electromagnetic Compatibility (EMC)
directive and the Low Voltage Directive (LVD) of the Union European
(EU). A Certificate of Compliance is available by contacting Technical
Support.
1.3 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; http://www.patton.com; or
support@patton.com.
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 2017RC. Technical Service hours: 8AM to 5PM EST, Monday
through Friday.
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3.0 CONFIGURATION
This section describes the location and orientation of the Model
2017RC's configuration straps, and details all possible settings. This
section also identifies factory default configuration settings.
3.1 FRONT CARD CONFIGURATION
The Model 2017RC uses one switch and one jumper per port that
allow configuration to a wide range of asynchronous applications.
These switches and jumpers are accessible when the card is slid out of
the rack chassis. Figure 1 shows the switches and jumpers on the
position of the Model 2017RC PC board.
3.1.1 Active/Passive Configuration
In any closed current loop, the transmitter
or
the receiver acts as
the active current source, while the other of the two must be passive.
To configure the Model 2017RC active/passive modes, you must first
determine whether the transmitter should be active or passive.
The active/passive switches are used to control the mode of the
20mA transmitters. Each converter on the dual port card has one
switch. As Figure 2 shows, the switch controls the mode of the
transmitter.
The Model 2017RC receivers are always passive.
WARNING: Never connect two active devices together. Your
configurations must be "active to passive" or "passive to active".
Figure 1. Model 2017RC front card, showing location of the Switches and Jumpers
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Active/PassiveSwitch
- Port A
Active/PassiveSwitch
- Port B
JB1
JB2
1
2
3
1
2
3
N
L
N
L
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3.1.2 Setting the Receiver Impedance Straps
JB1 and JB2 are used to set the input impedance of the port A and
port B receivers, respectively. This allows the user to choose the
optimum impedance setting for the particular application. There are
two possible positions for JB1 and JB2: strap covering posts 1 & 2, or
strap covering posts 2 & 3. Figure 3 shows the orientation of the strap
with respect to its post positions.
The following table provides a summary of strap functions rear
interface card.
Straps JB1 and JB2: Receiver Impedance
In the normal setting, JB1 and JB2 are positioned on posts 1 and
2. The “Normal” setting is best suited for applications in which two
Model 2017RCs are used together. The low impedance setting may
improve performance with other current loop devices.
JB1
Position 1&2 = Normal
(default)
Position 2&3 = Low Receiver Impedance
JB2
Position 1&2 = Normal
(default)
Position 2&3 = Low Receiver Impedance
NOTE: peg 1 is oriented toward top of card, peg 3 is oriented toward bottom of card
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Strap Position 1&2 Position 2&3
JB1 Normal
†
Low
JB2 Normal
†
Low
IMPEDANCE STRAP SUMMARY TABLE
NOTE: †indicates factory default
123 123 123
Figure 3. Orientation of interface card straps
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The table below provides a summary of strap functions for both of
the rear cards. Descriptions of each strap follow the table.
Line A Shield & Line B Shield (JB2 & JB4)
This strap pertains to the line interface. In position 1&2, the strap
links RJ-11 pins 1 and 6 (RJ-45 pins 2 and 7) to frame ground and the
rear panel. These pins can be used as connections for the twisted pair
cable shield. In position 2&3, pins 1 and 6 (or 2 and 7) are
disconnected from frame ground.
JB2
Position 1&2 = Line A Shield Connected to Frame Ground
Position 2&3 = No Shield
JB4
Position 1&2 = Line B Shield Connected to Frame Ground
Position 2&3 = No Shield
SGND & FRGND (JB5)
In position 1&2, this strap links signal ground and frame ground
through a 100 Ohm, 1/2 W resistor. In position 2&3, pin 1 is “not
connected to frame ground.
JB5
Position 1&2 = SGND and FRGND Connected
Position 2&3 = SGND and FRGND Not Connected
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Strap Position 1&2 Position 2&3
JB2 Line A Shield No Shield
†
JB4 Line B Shield No Shield
†
JB5 SGND & FRGND* Open (Not Connected)
†
JB6 Unit A DSR
†
N/A
JB7 Unit B DSR
†
N/A
INTERFACE CARD STRAP SUMMARY TABLE #1
NOTE†indicates factory default
*via 100 ohm resistor
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4.0 INSTALLATION
This section describes the functions of the Model 1000R16 rack
chassis, tells how to install front and rear Model 2017RC cards into the
chassis and provides diagrams for wiring up the interface connections
correctly.
4.1 THE MODEL 1000R16 RACK CHASSIS
The Model 1000R16 Rack Chassis (Figure 6) has sixteen short
range modem card slots, plus its own power supply. Measuring only
3.5” high, the Model 1000R16 is designed to occupy only 2U in a 19”
rack. Sturdy front handles allow the Model 1000R16 to be extracted
and transported conveniently.
4.1.1 THE RACK POWER SUPPLY
The power supply included in the Model 1000R16 rack uses the
same mid-plane architecture as the modem cards. The front card of
the power supply slides in from the front, and the rear card slides in
from the rear. They plug into one another in the middle of the rack.
The front card is then secured by thumb screws and the rear card by
conventional metal screws.
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WARNING! There are no user-serviceable parts in the
power supply section of the Model 2017RC. Fuse
replacement should only be performed by qualified
service personnel. Contact Patton Electronics Technical
support at (301)975-1007 for more information.
Figure 6. Model 1000R16 Rack Chassis with Power Supply
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4.4 TWISTED PAIR CONNECTION
The Model 2017RC operates half or full duplex over two twisted
pairs. In
all
applications, the twisted pair wire must be 26 AWG or
thicker, unconditioned, dry, metallic wire. Both shielded and unshielded
wire yield favorable results. Note: The Model 2017RC can only
communicate in a closed data circuit with another Model 2017RC or a
compatible 20mA device. Dial-up analog circuits, like those in a
standard Hayes-type modem, are
not acceptable.
For further
information, see Appendix B.
4.4.1 POINT-TO-POINT TWISTED PAIR CONNECTION
The 6-position RJ-11 and 8-position RJ-45 jack options for the
Model 2017RC (always the
upper
jack on the rear interface card) are
prewired for a standard TELCO wiring environment. Pin descriptions of
the RJ-11 and RJ-45 modular jacks.
RJ-1
1 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
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5.0 OPERATION
Once you have configured each Model 2017RC and connected the
cables, you are ready to operate the units. This section describes the
LED status monitors, and the power-up procedure.
5.1 LED STATUS MONITORS
The Model 2017RC features nine front panel LEDs that indicate
data activity and power status. Figure 7 (below) shows the positions of
the LEDs. Following Figure 7 are functional descriptions of each LED.
Power glows green when power is applied to the Model
2017RC front card.
TD (Transmit Data) - indicates status of transmit data
from the DTE. Red indicates a mark or idle state.
Green indicates a space or active state.
RD (Receive Data) - indicates status of receive data from
the DCE. Red indicates a mark or idle state. Green
indicates a space or active state.
5.2 POWER-UP
There is no power switch on the Model 2017RC: Power is
automatically applied to the 2017RC when its card-edge connector
touches the chassis' mid-plane socket, or when the chassis' power is
turned on.
Note: The 2017RC is a "hot swappable" card—it will not be
damaged by plugging it in or removing it while the rack is powered up.
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Figure 7. The Model 2017RC front panel, showing LED positions
Model 2017RC
Power
TD
RD
TD
RD
Unit
A
Unit
B
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APPENDIX B
PATTON MODEL 2017RC CABLE RECOMMENDATIONS
The following statements apply to the Model 2017RC when used as
a short range modem over private twisted pair:
All Patton Electronics Company Short Range Modems (SRMs) are
tested to the distances published in our Catalogs and Specification
Sheets on twisted-pair cable with the following characteristics:
W
ire Gauge Capacitance Resistance
19 AWG 83nF/mi or 15.72 pF/ft. .0163Ω/ft.
22 AWG 83nF/mi or 15.72 pF/ft. .0326Ω/ft.
24 AWG 83nF/mi or 15.72 pF/ft. .05165Ω/ft.
26 AWG 83nF/mi or 15.72 pF/ft. .08235Ω/ft.
We fully expect that the Short Range Modems will operate on lines
with specifications different from those tested, but to reduce the
potential difficulties in the field, one should ensure that the cable being
used has similar or better characteristics (lower capacitance or lower
resistance).
Wire with capacitance of 20pF/ft. or less is suitable for all our Short
Range Modems however, distances may vary from those published in
our catalog. Resistance will also affect distance but not functionality.
Wire should be 26 AWG or larger (smaller AWG#).
Patton products are designed to withstand normal environmental
noise and conditions; however, other environmental factors too
numerous to discuss in this format may affect proper operation of the
SRM’s.
Selection of the proper SRM for an application is critical to
maintaining Customer Satisfaction and must be taken seriously.
Certain models are better suited for particular applications and
environments than others.
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APPENDIX D
PATTON MODEL 2017RC
INTERFACE SETTINGS AND ORIENTATION
Copyright © 1997
Patton Electronics Company
All rights reserved
PATTON MODULAR INTERFACE - 10 Wire RJ-45
Contact Number Circuit Description
1 N/A Not Used
2 125 DSR
3 109 Received Line Signal Indicator (CD)
4 108 / 2 DTE Ready (DTR)
5 102 Signal Common
6 104 Received Data
7 103 Transmitted Data
8 106 Clear to Send
9 105 / 133 Request to Send / Ready for Receiving
10 N/A Not Used
Pins 2-9 conform to the EIA/TIA-561 eight position non-synchronous interface standard.
For all modular jacks
(6, 8 or 10 position):
Pin 1 is always toward
the bottom when the
rear card is oriented
correctly in the slot
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