Campbell SDM-CD16D Manuale utente

SDM-CD16D

16 Channel Digital Control

Port Expansion Module

User Guide

Issued 15.6.99

Guarantee

This equipment is guaranteed against defects in materials, workmanship,

and software. 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 Refer-

ence 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 re-

pairs 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, Leicestershire, LE12 9RP, UK

Tel: +44 (0) 1509 601141

Fax: +44 (0) 1509 601091

Email: [email protected]

www.campbellsci.co.uk

Contents

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

2. Control Specifications..................................................1

2.1 General................................................................................................1

2.2 Output Specifications...........................................................................2

3. Power Considerations..................................................2

4. Installation.....................................................................3

4.1 Controlled Device Connections............................................................4

5. Address Selection Switches........................................5

6. Datalogger Instructions 104 (CR10/10X, CR23X,

21X & newer CR7s) and 29 (older CR7s)...................6

7. Theory of Operation......................................................7

8. Program Example..........................................................7

Figures

1. SDM-CD16D.........................................................................................1

2. Equivalent Output Driver Circuit...........................................................2

3. Connection Block Diagrams...................................................................3

4. Use of Terminal Blocks..........................................................................5

5. Address Selection Switch.......................................................................6

Tables

1. Datalogger to SDM-CD16D Connections...............................................4

2. Switch Position and Address..................................................................5

SDM-CD16D 16 Channel Digital Control

Port Expansion Module

The SDM-CD16D (see Figure 1) is a synchronously addressed peripheral. It has 16 control

ports and is compatible with Campbell Scientific’s CR10/10X, CR23X, CR7 and 21X

dataloggers.

Figure 1 SDM-CD16D

1. Introduction

The SDM-CD16D expands the digital output capability of Campbell Scientific

dataloggers. The outputs can be set to 0 or 5V by the datalogger. In addition to

being able to drive normal logic level inputs, when an output is set HI a ‘boost’

circuit allows it to source a current of up to 100mA, allowing direct control of low

voltage valves, relays etc.

The SDM-CD16D is a synchronously addressed datalogger peripheral. Datalogger

control ports 1, 2 and 3 are used to address the SDM-CD16D then clock out the

desired state of each of the 16 control ports. Up to sixteen SDM-CD16Ds may be

addressed, making it possible to control a maximum of 256 ports from the first

three datalogger control ports.

CR10/10X, CR23X, CR7 and 21X dataloggers use I/O Instruction

104 to control the SDM-CD16D.

Older dataloggers with pre-OS7.1 software may not have the

necessary instruction, or may use Instruction 29. Ensure that your

datalogger contains the appropriate instruction before using.

2. Control Specifications

2.1 General

Compatible dataloggers: CR10/10X, CR23X, CR7 and 21X

Operating voltage: 12V DC nominal (9 to 18V)

Current drain at 12V DC: 100µA typical (All ports HI, no load)

Total cable length: 6m (CR10/10X, CR23X, 21X), 180m (CR7)

NOTE

SDM-CD16D 16 Channel Digital Control Port Expansion Module

2.2 Output Specifications

Output Voltage (no load): Output ON/HI, Nominal 5V (Minimum 4.5V)

Output OFF/LO, Nominal 0V (Maximum 0.1V)

Output Sink Current: Output will sink 8.6mA from a 5V source*

Output Source Current: Output will source 36mA @ 3V,

115mA short-circuited to ground*

Max. Output Current: 400mA at 50°C and 12V supply (see NOTE below)

(total all outputs)

The maximum current should be derated under the following

conditions:

50mA for every 10°C above 50°C and/or 50mA for every volt

above 12V.

Operating temp.: -25°C to +70°C standard

Size: 230mm wide x 100mm high x 24mm deep

Weight: 350g

EMC Status: Complies with EN55022-1:1998 and

EN50082-1:1998

* If more detailed output characteristics are required, experienced users should consult the

equivalent circuit diagrams shown in Figure 2, below.

Figure 2 Equivalent Output Driver Circuit

3. Power Considerations

The SDM-CD16D power requirements are large compared to most Campbell

Scientific products when driving significant loads. For many applications an

external power supply, as shown in Figure 3, is recommended to power the

SDM-CD16D.

For some applications it may be convenient to use the datalogger supply to power

the SDM-CD16D, as shown in Figure 3. For long-term applications, the lead-acid

power supply available with Campbell Scientific dataloggers should be used,

allowing the batteries to be float charged. Alkaline batteries are not recommended

for long term applications.

NOTE

0.6V Drop

Output

580R

Output set ON/HI Output set OFF/LO

5V, 0Ω

User Guide

Connection with External Supply

Connection with Datalogger Supply

Figure 3 Connection Block Diagrams

If the 21X power supply is used to power the SDM-CD16D, all low

level analogue measurements (thermocouples, pyranometers,

thermopiles, etc.) must be made differentially.This is a result of slight

ground potentials created along the 21X analogue terminal strip when

the 12V supply is used to power peripherals. This limitation reduces

the number of available analogue input channels and may make an

external supply for the SDM-CD16D essential.

4. Installation

For correct operation the SDM-CD16D must be installed where there is no

risk of water ingress or condensation.

The order in which connections are made is critical.

Always

connect 12V first

, followed by ground, then the control ports.

For datalogger connections, see Table 1, below. Please refer to Figure 4 for details

of how to use the spring-loaded terminals.

NOTE

CAUTION

GND

EXTERNAL

9 TO 18V DC

+ –

SDM-CD16D DATALOGGER

12V C1

SDM-CD16D DATALOGGER

GND

12V

SDM-CD16D 16 Channel Digital Control Port Expansion Module

Table 1 Datalogger to SDM-CD16D Connections

Connection Order SDM-CD16D Datalogger Function

First 12V 12V on datalogger or

external supply

Power

Second

or G

C1 (Control Port 1)

C2 (Control Port 2)

C3 (Control Port 3)

Common Ground

Data

Clock

Enable

Multiple SDM-CD16Ds may be wired in parallel by connecting the datalogger

side of one SDM-CD16D to the next.

The transient protection of the SDM-CD16D relies on a low resistance path

to earth. Ensure that the ground return wire has as low a resistance as

possible. Where long cable runs are likely, or where lightning damage is a

possibility, the SDM-CD16D can be fitted with gas discharge tubes. Please

contact Campbell Scientific for details.

For CR10/10X, CR23X and 21X dataloggers, the total cable length

connecting SDM-CD16Ds to SDM-CD16Ds and the datalogger

should not exceed 6m. Total cable lengths in excess of 6m will

adversely affect communication performance. For CR7 dataloggers,

the total cable length can be up to 180m.

4.1 Controlled Device Connections

The SDM-CD16D uses spring-loaded terminal blocks, which provide quick,

vibration resistant, connections. The output terminals are labelled 1 to 16. A

common ground connector is provided between each pair of terminals

Use a screwdriver in either the top or front slot, as appropriate, to open the

terminal spring. Strip any insulation from the wire to give 7 to 9mm bare wire.

Push the wire into the opening, and, while holding it in position, withdraw the

screwdriver to release the spring. The wire will now be firmly held in place. See

Figure 4, below.

You cannot reliably insert more than one solid-core wire into one

terminal connector unless the wires are soldered or clamped

together. When inserting more than one stranded wire, twist the bare

ends together before insertion.

NOTE

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