Spectrum 3365WD2 Product Manual

®

Short-Range Modem Pair

PRODUCT MANUAL

Item # 3365WD2

CONTENTS

General Overview 3
Components 3

Cable Connection 4
Connecting to the Computer 5

Connecting to the Weather Station 6
Warranty 7

This manual will familiarize you with the features and

operation of your new Short-Range Modem Pair. Please

read this manual thoroughly before using your

instrument. For customer support, or to place an order,

call Spectrum Technologies, Inc. at [phone] or

[phone] between 7:30 am and 5:30 p.m. CST,

FAX at [phone], or E-Mail at

2

[e-mail].

Spectrum Technologies, Inc

12360 S. Industrial Dr. East

General Overview

The short-range modem pair will allow you to ex­tend the range of your WatchDog Weather Station
up to 4000 ft. Because the station is hardwired to
your computer, it is not necessary to have a line of
sight with the station.

Components

The components of the short-range modem pair
are as follows:

1. Optically Isolated RS-485 Converter

2. 3349CB RS-422 Connector Assembly

3. Short-range modem adaptor and modular con­nector cable.

4. A/C adapter

The 2 converters must be connected by a length
of 6-wire cable (2 twisted pair, 1 ground, 1 volt­age). The recommended wire type is number 24
AWG twisted-pair telephone cable with a shunt
capacitance of 16 picofarads/foot and a length no
greater than 4000 feet.

3

Cable Connection

The twisted-pair cable should be connected to the two convert­ers and the A/C adaptor as shown in figure 1.

IMPORTANT: the wire connected to a Transmit Data terminal
[TD(A) or TD(B)] of one converter must be connected to the
corresponding Receive Data terminal [RD(A) or RD(B)] of the
other converter.

The ground (GRD) and voltage (12V) terminals of one con­verter should be connected to the corresponding terminal of the
other. The black wire from the A/C adaptor is connected to the
GRD terminal of the RS232-RS485 converter. The black/white
wire connects to the 12V terminal.

If the case of the 03349CB RS422 Converter has been closed,
it can be opened by inserting a screwdriver in the side slots and
rotating to separate the halves.

Note

: The twisted pair cable should be run through the right-

most hole in the bottom of the weather station enclosure be­fore connecting to the RS232-RS422 converter. The RS232-

RS422 converter will then rest inside the weather station enclo­sure (see photo on page 6).

PC End Weather Station End

TD(A)
TD(B)
RD(A)
RD(B)
GND
12V

RS232 - RS485

black
black/white

4

RS232 - RS422

TD(A)
TD(B)
RD(A)
RD(B)
GND
12V

A/C

Adaptor

Fig. 1: Component Wiring Diagram

Connecting to the Computer

Before powering the short-range modem pair with the A/C
adaptor, check that the jumper clip on the RS232-RS485
converter is in the Echo-On

position as shown in figure 2.

Jumper Clip

Echo

Off

Pins

Figure 2: Top view of Echo On/Off switch

The 9-pin female connector of the RS232-RS485 converter
connects to the computer data port. This converter is opti­cally isolated so voltage spikes in the twisted-pair cable
should not damage your computer.

In SpecWare go to File → Preferences →

Communication→ Advanced Options. Uncheck the
Hardware Flow Control (RTS) (see fig. 3). This must be

unchecked for the modem to work correctly.

On

Fig. 3: Hardware Flow Control Option (Specware 9)

5

Connecting to Weather Station

The 9-pin male connector of the short-range modem
adaptor is attached to the 3349CB RS422 converter.
The modular connector snaps into the auxiliary port
(Aux) of the weather station. Secure the twisted-pair
cable into the notch in the right-most hole and snap the
cap over the hole. The flat edge of the cap should rest
against the cable.

The converter and adapter fit snuggly behind the sensor
wires as shown in the photo below. This will make it
easier to remove and replace external sensor wires.

Note: It is advisable to confirm the connection before
installation of the cable.

6

Warr anty

This product is warranted to be free from defects in material
or workmanship for one year from the date of pur­chase. During the warranty period Spectrum will, at its op­tion, either repair or replace products that prove to be de­fective. This warranty does not cover damage due to im­proper installation or use, lightning, negligence, accident, or
unauthorized modifications, or to incidental or consequen­tial damages beyond the Spectrum product. Before return­ing a failed unit, you must obtain a Returned Materials Au-

7

[phone] or [phone]

12360 S. Industrial Dr. East

Plainfield, IL 60585

FAX: [phone]

E-Mail: [e-mail]

www.specmeters.com

Rev. 05/2012