Campbell DCSCOM User manual

DCSCOM

Telephone Modem

User Guide

Issued 1.3.99

Guarantee

This equipment is guaranteed against defects in materials and

workmanship. This guarantee applies for twelve months from date of

delivery. We will repair or replace products which prove to be defective

during the guarantee period provided they are returned to us prepaid. The

guarantee will not apply to:

•Equipment which has been modified or altered in any way without the

written permission of Campbell Scientific

•Batteries

•Any product which has been subjected to misuse, neglect, acts of God

or damage in transit.

Campbell Scientific will return guaranteed equipment by surface carrier

prepaid. Campbell Scientific will not reimburse the claimant for costs

incurred in removing and/or reinstalling equipment. This guarantee and the

Company’s obligation thereunder is in lieu of all other guarantees,

expressed or implied, including those of suitability and fitness for a

particular purpose. Campbell Scientific is not liable for consequential

damage.

Please inform us before returning equipment and obtain a Repair

Reference Number whether the repair is under guarantee or not. Please

state the faults as clearly as possible, and if the product is out of the

guarantee period it should be accompanied by a purchase order.

Quotations for repairs can be given on request.

When returning equipment, the Repair Reference Number must be clearly

marked on the outside of the package.

Note that goods sent air freight are subject to Customs clearance fees

which Campbell Scientific will charge to customers. In many cases, these

charges are greater than the cost of the repair.

Campbell Scientific Ltd,

Campbell Park, 80 Hathern Road,

Shepshed, Loughborough, LE12 9GX, UK

Tel: +44 (0) 1509 601141

Fax: +44 (0) 1509 601091

Email: [email protected]

www.campbellsci.co.uk

Contents

1. Introduction................................................................ 1

2. Installation.................................................................. 2

2.1 Modem Configuration...............................................................................3

3. Power Requirements ................................................. 3

4. Troubleshooting.......................................................... 3

Appendix A. ‘AT’ Command Summary......................A-1

Figures

1. Connector Pin Diagram...............................................................................2

2. Schematic Diagram of Datalogger-Modem Connections ...........................3

DCSCOM Telephone Modem

The DCSCOM is based around the Dataflex Pocket Stradcom, a commercial BABT-approved

telephone modem. A summary of the features of the DCSCOM is given below.

Features of the DCSCOM include:

• Initiate and receive calls –full duplex at 1200 baud

• ‘AT’ command set

• Fitted with BT miniature modular telephone plug

• Pulse or tone dialling

• Direct connection to and powered by Campbell Scientific dataloggers using the interface

provided

• Signal level connects/disconnects 5V DC external power, minimising current drain

The DCSCOM, as configured, fully meets the BABT approval

requirements and responds to the industry standard Hayes ‘AT’

command set.

1. Introduction

The DCSCOM modem is fully Hayes compatible and can be used at 1200 baud to

both receive calls and initiate calls from the datalogger (using instruction 97). For

more information on datalogger programming refer to the description of

Instruction 97 in the datalogger manual.

The DCSCOM is powered from the 5V supply of the datalogger. Current con-

sumption is 0.002mA when off-line and less than 30mA when on-line. The

interface allows the datalogger to switch the power to the modem on and off.

When the modem is switched off, incoming calls are detected by the datalogger

via this interface; the datalogger responds by turning on the modem to answer the

call.

The DCSCOM is connected to a Campbell Scientific datalogger via a special ‘D’

connector interface which plugs directly into the 25-way connector on the modem.

The design of the interface allows other devices (for example a Campbell

Scientific Storage Module) to be connected in parallel with the modem. The other

end of the interface is connected to the datalogger using the 9-pin subminiature

SC12 ribbon cable supplied. The pin-out of the connector is shown in Figure 1.

The pins used by the modem are as shown below. All levels are 0V for logic low,

5V for logic high.

NOTE

DCSCOM Telephone Modem

1. (input) +5V regulated supply

2. (input) Ground

3. (output) Ring: a logic high signifies a ring signal has been detected.

4. (output) Rx Data: serial data from modem

5. (input) Modem Enable: a logic high turns on 5V power to the modem. A

logic low shuts off 5V power to the modem.

6. No Connection

7. No Connection

8. No Connection

9. (input) Tx Data: serial data to the modem.

Figure 1 Connector Pin Diagram

2. Installation

The modem is designed to plug into a modern British Telecom modular telephone

socket. We do not recommend the connection of a telephone in parallel with the

modem as (by default) the modem will answer all incoming calls (see below).

If you intend to use the modem on a remote telephone line, we recommend that

you install lightning arrestors on the telephone line; note that the warranty on the

DCSCOM does not cover lightning damage. Please contact British Telecom or

Campbell Scientific for further details.

Once the modem has been connected to the telephone line, plug the special silver

25-way ‘D’ connector (marked ‘DCSCOM INTERFACE’) into the modem. Connect

the interface to the datalogger’s serial I/O port using the 9-way SC12 ribbon cable

supplied. A connection diagram is shown in Figure 2. When the datalogger is

turned on, the modem will answer an incoming call.

The modem will not answer the telephone if the datalogger is not

powered up.

To check for correct operation, call the modem/datalogger from another telephone

using a modem connected to a PC running appropriate Campbell Scientific

datalogger support software. The DCSCOM detects the speed of incoming calls

automatically.

NOTE

User Guide

The ringer equivalence number (REN) of the DCSCOM is 3. For

correct operation you should ensure that the sum of the RENs for

all equipment connected to one telephone line does not exceed 4.

You can usually assume that British Telecom equipment has a REN

of 1 unless otherwise marked.

Figure 2 Schematic Diagram of Datalogger-Modem Connections

2.1 Modem Configuration

The modem is supplied pre-configured for use with Campbell Scientific

dataloggers, and there are no user configurable switches inside the modem.

Opening the modem casing for any reason will invalidate the

warranty.

3. Power Requirements

The power requirements of the modem are given in Section 1. When not com-

municating, power consumption is negligible. However, note that the on-line

consumption, although not great, is large compared to the datalogger’s normal

requirements. This must be taken into consideration when estimating the size of

battery pack needed to run the datalogger, especially if the datalogger is to be

called for long periods via the modem.

4. Troubleshooting

If any of the telephone equipment is not operating properly, you should immediately

remove it from your telephone line and establish the cause of the problem.

For assistance in installation or for repair, please contact Campbell Scientific or

your local representative.

NOTE

CAUTION

To BT Modular

Telephone Socket

DCSCOM

Modem

Special DCSCOM

Interface Connector

SC12 Cable

Typical Datalogger

Spare connector for

connecting SM192

Storage Module, etc.

Serial I/O Port

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