Patton electronics 2017P Manuel utilisateur
USER
MANUAL
MODEL 2017P
RS-232 to 20mA and
MODEL 2017P60
RS-232 to 60mA
Current Loop Converters
07M2017P-E
Doc# 073051UE
Revised 5/7/96
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
1.0 WARRANTY INFORMATION
Patton Electronics warrants all Model 2017P 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 2017P 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 2017P 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
2017P 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
converter. 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 (310) 975-1000.
2.1 FEATURES
• Full duplex, asynchronous operation over 4 wires
• Data rates to 115,200 bps
• Model 2017P works with active 20mA devices
• Model 2017P60 works with active 60mA devices
• Range to 4 miles on 24 AWG twisted pair
• No AC power required
• Optically isolated and surge protected
• Twisted pair connection via terminal blocks, RJ-11 or RJ-45 jacks
• External DCE/DTE switch
• Made in the USA
2.2 DESCRIPTION
The Model 2017P RS-232 to 20mA current loop converter lets
an asynchronous RS-232 device communicate with a 20mA current
loop device (the Model 2017P60 works with 60mA current loop
devices). The Model 2017P requires no AC power or batteries to
operate and supports data rates to 115.2 Kbps.
Operating full duplex, the Model 2017P supports communication
distances up to 4 miles over two unconditioned 24 AWG twisted pair.
To guard against data loss due to ground loops, the Model 2017P is
equipped with 2500V RMS optical isolators on the line side.
The Model 2017P connects directly to the RS-232 interface using a
male or female DB-25 connector. Two-pair cable running to the 20mA
current loop device attaches to the Model 2017P by RJ-11 jack, RJ-45
jack or terminal blocks with built-in strain relief. An external DCE/DTE
switch on the Model 2017P eliminates the need for a cross-over cable
on the RS-232 interface. Like all Patton products, the Model 2017P is
manufactured in the USA.
2
3.0 CONFIGURATION
The Model 2017P is designed to be easy to use. There are no
internal jumpers or DIP 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). The only configuration necessary for
operation is proper setting of the external DCE/DTE switch.
The diagram below shows the location of the DCE/DTE switch on
the PC board, as well as the location of the terminal block and surge
suppressors ("S" model only).
3.1 SETTING THE DCE/DTE SWITCH
For your convenience, the Model 2017P has an externally
accessible DCE/DTE switch (see diagram below). If the RS-232 device
connected to the Model 2017P is a modem or multiplexer (or is wired
like one), set the switch to "DTE". This setting causes the Model 2017P
to behave like Data Terminal Equipment and transmit data on pin 2.
If the RS-232 device connected to the Model 2017P is a PC,
terminal or host computer (or is wired like one), set the switch to "DCE".
This setting causes the Model 2017P to behave like Data
Communications Equipment and transmit data on pin 3.
43
4.0 INSTALLATION
The Model 2017P is simple to install. After configuring the
DTE/DCE switch, connect the two twisted pairs using one of three
methods: terminal blocks with strain relief, RJ-11 jack or RJ-45 jack.
The method you use will depend on the specific model you have.
4.1 TWISTED PAIR WIRING OVERVIEW
Only one Model 2017P is needed for each RS-232 to 20mA (or
60mA) current loop circuit. The Model 2017P is connected to the
current loop device using two twisted pairs. The pairs must be "dry"
(unconditioned) metallic wire, 19 - 26 AWG. Best distance is achieved
with larger gauges. When you have completed wiring for your data
circuit, the pin connections should be as shown below:
4.1.1 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
The terminal block/strain relief version of the Model 2017P allows
you to hook up the line side interface using bare wires. The following
instructions will tell you how to open the case, connect the bare wires
and fasten the strain relief collar in place.
1. Open the unit by gently inserting a screw driver between the
DB-25 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.
DCE/DTE
Switch Terminal
Block
Opto
Isolator
Opto
Isolator
XMT + RCV+
XMT - RCV -
GG
RCV + XMT +
RCV - XMT -
To Shield (Optional) }One Pair
}One Pair
DCE DTE
Once the unit has been opened, you will be able to see the
terminal blocks located at the rear of the PC board.
2. Strip the outer insulation from the twisted pairs about one inch
from the end.
3. Strip back the insulation on each of the 2 twisted pair wires
about .25".
4. Connect one pair of wires in the telephone cable to "XMT"
(Transmit) on the terminal block, being careful to observe the polarity.
(The wire connected to "XMT+"must be connected at the other end of
the telephone line to "RCV+" in the other unit and the wire connected to
"XMT-" must be connected at the other end of the telephone line to
"RCV-" in the other unit).
5. Connect the other pair of wires in the telephone cable to "RCV"
(Receive), again being careful to observe the polarity. (The wire
connected to "RCV+" must be connected at the other end of the
telephone line to "XMT+" in the other unit and the wire connected to
"RCV-" must be connected at the other end of the telephone line to
"XMT-" in the other unit).
6. 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 these units.
7. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
8. 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.
5 6
RCV G XMT RCV G XMT
RCV G XMT
- + - + RCV G XMT
- + - +
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.
10. BEND the top half of the case as necessary to place it over the
strain relief assembly. Do not snap the case together yet.
11. Insert one captive screw through a saddle washer and then
insert the captive screw with the washer on it, 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 the cable installation
process.
4.1.2 TWISTED PAIR CONNECTION USING MODULAR JACKS
The modular versions of the Model 2017P have an RJ-11 or RJ-45
jack mounted in the case. These jacks are prewired for a standard
TELCO wiring environment. To be sure you have the right wiring, use
the table below as a guide.
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
4.2 COMPLETING THE INSTALLATION
Once you have configured the unit for DTE or DCE and connected
the twisted pair wires correctly, simply plug the Model 2017P into the
RS-232 data port. Remember to insert and tighten the two captive
connector screws.
The Model 2017P requires no power supply or batteries for
operation. It will work automatically at any data rate from 50 to 19,200
bps, as long as there is any data or control voltage being applied.
7 8
1 - Blue
2 - Yellow
3 - Green
4 - Red
5 - Black
6 - White
1 - Blue
2 - Orange
3 - Black
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
RCV G XMT
RCV G XMT
- + - +
APPENDIX A
SPECIFICATIONS
Transmission Line: 19 to 26 AWG twisted pair
Range: 4 miles on 24 AWG twisted pair
Interfaces: Asynchronous, EIA RS-232, CCITT V.24 full duplex,
20mA current loop (Model 2017P60 connects to 60mA current loop)
Data Rates: 0 - 115.2 Kbps
Isolation: 2500V RMS via opto-isolators
Surge Suppression: Over-voltage protection for opto-isolators via
Silicon Avalanche Diodes
Connectors: DB-25 male or female on RS-232 side; RJ-11, RJ-45
or terminal block with strain relief on current loop side
Power Supply: No external power required; uses power from NIC
data signals
Temperature Range: 0-50°C (32-122°F)
Altitude: 0-15,000 feet
Humidity: Up to 95% non-condensing
Dimensions: 2.50"L x 1.2"H x 0.75"W
Weight: 1.5 oz
APPENDIX B
RS-232C PIN CONFIGURATIONS
9 10
1- (FG) Frame Ground
2- (TD) Transmit Data To Mdl 2017P
3- (RD) Receive Data From Mdl 2017P
4- (RTS) Request to Send To Mdl 2017P
5- (CTS) Clear to Send From Mdl 2017P
6- (DSR) Data Set Ready From Mdl 2017P
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect From Mdl 2017P
To Mdl 2017P Data Term. Ready (DTR) - 20
DIRECTION STANDARD "DCE" SETTING DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data From Mdl 2017P
3- (RD) Receive Data To Mdl 2017P
4- (RTS) Request to Send From Mdl 2017P
5- (CTS) Clear to Send To Mdl 2017P
6- (DSR) Data Set Ready To Mdl 2017P
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect To Mdl 2017P
From Mdl 2017P Data Term. Ready (DTR) - 20
DIRECTION STANDARD "DTE" SETTING DIRECTION
APPENDIX C
BLOCK DIAGRAM
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