Patton electronic 2017P RS-232, 2017P60 RS-232 User Manual

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
[phone]
TECHNICAL SUPPORT
[phone]

1.0 WARRANTY INFORMATION

2.0 GENERAL 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 [phone].

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.

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 [phone].

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

• 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.

devices

1

2

3.0 CONFIGURATION

4.0 INSTALLATION

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).

DCE/DTE

Switch

Opto

Isolator

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.

Terminal

Block

Opto

Isolator

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:

XMT + RCV+
XMT - RCV ­GG
RCV + XMT +
RCV - XMT -

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.

To Shield (Optional)

One Pair

}

One Pair

}

DCE

DTE

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