Campbell CS-SRM User manual

CS-SRM

Short Range Modem

Package

User Guide

Issued 26.6.07

CSL 700

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. Description................................................................... 1

2. Specifications.............................................................. 2

3. Installation ................................................................... 3

3.1 Connection to a Remote Printer................................................................4

3.2 Protection from Transients........................................................................4

4. Operating Distance ..................................................... 6

Figures

1. Typical installation of CS-SRM in logger enclosure..................................2

2. Block Diagram of CS-SRM Installation.....................................................3

3. Wiring and Installation of Surge Protectors for a Typical CS-SRM

Setup..........................................................................................................5

4. Switch Settings for DCE/DTE....................................................................6

Tables

1. Maximum Transmission Distance ..............................................................6

CS-SRM Short Range Modem Package

The CS-SRM short range modem package is used for direct communication between a

Campbell Scientific datalogger and a computer over distances up to 12km (depending on

baud rate and wire gauge). The package consists of:-

2 off RAD-SRM Asynchronous Short Range Modems

1 off RAD-SP In-line Surge Protector

1 off RAD-SP Station Surge Protector

1 off SC932C Compact RS232 Interface

1 off 9-Pin to 25-Pin Cable.

The standard RAD-SRM ensures integrity of data transmission using unconditioned 4-wire

links at data rates of up to 19,200 baud. The CS-SRM is supplied specifically to connect the

CS I/O part of a Campbell Scientific Datalogger to a RS232 COM port on a PC. The use of

USB-RS232 converters may be possible, if power to the RAD-SRM modem is on continually.

For other connection requirements, please contact Campbell Scientific for advice.

RAD

SRM-5A

THIS EQUIPMENT COMPLIES WITH THE REQUIREMENTS IN

PART IS OF FCC RULES FOR A CLASS A COMPUTING DEVICE.

E109091

LISTED

46D2

NWGQ

1. Description

The CS-SRM can operate without an external supply, the small amount of current

required being drawn from the RS232 circuits. A switch-selectable DCE/DTE

option allows the RAD-SRM modem to operate as a DTE-type device for

connection to another piece of DCE equipment without the need for a cross-over

cable (see Figure 2).

The RAD-SRM has transformer coupling between itself and the 4-wire cable

which, in conjunction with electronic circuitry, protects it from AC or DC

overvoltages up to 1500V RMS and provides isolation for the two ends of the link.

The standard modem is not BABT approved and should therefore not be used in

the UK on leased lines. Please contact Campbell Scientific if you require a BABT

approved modem.

CS-SRM Short Range Modem Package

2. Specifications

Data rate: Up to 19,200 baud (dependent on datalogger)

Transmission line: 4-wire unconditioned cable (two twisted pairs)

Transmission mode: Asynchronous, full duplex

Transmission level: 0dBm

Terminal interface: RS232, 9-way D-type female connector

(25-way D-type female on the RAD-SRM)

Transmission range: Up to 12km (see Table 1)

Line Interface: 5-way (four wires and ground) via terminal block

Power Requirements: No external power required. Takes less than 2.5mA

quiescent, 10-15mA active with SC932C

Protection: AC/DC over-voltage protection circuits are connected via

isolation transformers rated at 1,500V RMS

Operating temperature: 0°C to +50°C (extended temperature testing available)

Humidity: Up to 90%, non-condensing

Length: 52mm

Width: 53mm

Height: 18mm

Weight: 38g

Figure 1 Typical Installation of CS-SRM in logger enclosure

User Guide

3. Installation

Use the SC932C 9-Pin to RS232-DCE Interface between the RAD-SRM and the

datalogger.

4-Wire Telephone Line

or 2 Twisted Pairs

RAD-SP

(if required)

RAD-SRM

Modem

SC25/

SC25AT

Cable PC

SC932 Datalogger

RAD-SP

(if required)

RAD-SRM

Modem

Datalogger

CS I/O Port

SC932C

Figure 2 Block Diagram of CS-SRM Installation

Install the modems as follows:

1. Set the DCE/DTE switch in the RAD-SRM to DCE. (This is the default

setting and all CS-SRM modems are supplied with the switch in this

position.) To gain access to this switch and the line interface terminal block,

separate the two halves of the plastic cover by pressing the marked places on

the sides starting at the cable end.

2. Select a suitable cable with two twisted pairs (see Section 4).

3. Connect the four conductors to the screw terminal block, with the transmit

pair connected to the terminals labelled ‘XMT’ and the receive pair to the

terminals labelled ‘RCV’. (See Figure 2; note that the wires labelled A and B

are one twisted pair of the cable, and the wires labelled C and D are

the other twisted pair.) A ground terminal is provided to connect the cable

shield (if present) at one end of the link only.

It is vital that the +XMT and -XMT terminals on one modem are connected

to the +RCV and -RCV terminals, respectively, on the other modem.

NOTE

4. Transients induced on the communication line may damage electronic

equipment connected at either end of the line. To decrease the chances of

damage, install earthed surge protectors as shown in Figure 2. Suitable

protectors are supplied in the CS-SRM package (model RAD-SP). The wiring

is straight through such that pin to pin continuity exists between the two

modems.

If the modems are installed entirely within a building the surge protectors

are not needed, unless the cable length exceeds 200m. Campbell Scientific

will not accept any warranty claims where damage to the CS-SRM has

occurred because the recommended surge protectors were not used.

NOTE

CS-SRM Short Range Modem Package

5. Close the unit by pressing the two halves of the cover together. Connect one

modem directly to the RS232 port on the computer and connect the other to

the SC932C interface.

6. Referring to the SC932C manual, check that its internal jumpers are set in

the correct position for use with the CS-SRM modem.

7. This modem requires no specific set up in the latest version of PC400 or

LoggerNet, as the software will be aware of its presence.

3.1 Connection to a Remote Printer

Please refer to the SC932C Manual for details of connection to a remote printer.

3.2 Protection from Transients

The RAD-SP spark-gaps provide protection both for the datalogger

and RAD-SRM units from induced voltage transients in the

interconnecting cable. Please be aware that the RAD-SRM linked to

the computer can still be damaged by transients coming from the

PC, and in such circumstances considerable damage is also often

done to the PC itself. These transients can come from the AC power

lines to the PC or its peripherals and/or connections to other remote

peripherals (e.g. via network links) and are typically caused when

lightning strikes overhead power lines. As the RAD-SP units and the

datalogger protection devices act as low resistance clamps to

ground, the PC may offer the path of least resistance to ground

compared to other equipment.

CAUTION

To protect the PC and the RAD-SRM from this type of damage fit

the power supply lines to the PC with good quality surge arrestors.

These should also be fitted to any network or serial connections to

other devices. Please contact your computer dealer for the supply of

such devices.

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