Campbell SDM-CD16D Manual de usuario

SDM-CD16D 16 Channel Digital

Control Port Expansion Module

Revision: 8/07

Campbell Scientific, Inc.

Warranty and Assistance

The SDM-CD16D 16 CHANNEL DIGITAL CONTROL PORT

EXPANSION MODULE is warranted by CAMPBELL SCIENTIFIC, INC. to

be free from defects in materials and workmanship under normal use and

service for twelve (12) months from date of shipment unless specified

otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s

obligation under this warranty is limited to repairing or replacing (at

CAMPBELL SCIENTIFIC, INC.'s option) defective products. The customer

shall assume all costs of removing, reinstalling, and shipping defective

products to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC,

INC. will return such products by surface carrier prepaid. This warranty shall

not apply to any CAMPBELL SCIENTIFIC, INC. products which have been

subjected to modification, misuse, neglect, accidents of nature, or shipping

damage. This warranty is in lieu of all other warranties, expressed or implied,

including warranties of merchantability or fitness for a particular purpose.

CAMPBELL SCIENTIFIC, INC. is not liable for special, indirect, incidental,

or consequential damages.

Products may not be returned without prior authorization. The following

contact information is for US and International customers residing in countries

served by Campbell Scientific, Inc. directly. Affiliate companies handle

repairs for customers within their territories. Please visit

www.campbellsci.com to determine which Campbell Scientific company

serves your country. To obtain a Returned Materials Authorization (RMA),

contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an

applications engineer determines the nature of the problem, an RMA number

will be issued. Please write this number clearly on the outside of the shipping

container. CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____

815 West 1800 North

Logan, Utah 84321-1784

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

SDM-CD16D Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use

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

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

2.1 General......................................................................................................2

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

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

4. Installation....................................................................4

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

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

6. Datalogger Instructions ..............................................7

6.1 CRBasic....................................................................................................7

6.2 Edlog.........................................................................................................7

7. Theory of Operation ....................................................8

8. Program Examples......................................................8

8.1 CRBasic Example.....................................................................................9

8.2 Edlog Example .........................................................................................9

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 Addresses...................................................................6

This is a blank page.

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.

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 5 V 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 100 mA, allowing direct control of

low voltage valves, relays etc.

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

ports on the datalogger 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 three

datalogger SDM ports.

In CRBasic, instruction SDMCD16AC is used to control the SDM-CD16D. In

Edlog, Instruction 104 is typically used; older CR7 dataloggers use Instruction

29.

Older CR7 dataloggers with pre-OS7.1 software may not have

the necessary instruction. Ensure that your datalogger contains

the appropriate instruction before using.

NOTE

SDM-CD16D 16 Channel Digital Control Port Expansion Module

2. Control Specifications

2.1 General

Compatible dataloggers: CR800, CR850, CR1000, CR3000, CR5000,

CR10(X), CR23X, CR7 and 21X

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

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

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

2.2 Output Specifications

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

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

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

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

115 mA short-circuited to ground*

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

(total all outputs)

The maximum current should be derated under the following

conditions: 50 mA for every 10°C above 50°C and/or 50 mA for

every volt above 12 V.

NOTE

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

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

Weight: 350 g

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.

0.6V Drop

Output

580R

Output set ON/HI Output set OFF/LO

5V, 0Ω

FIGURE 2. Equivalent Output Driver Circuit

SDM-CD16D 16 Channel Digital Control Port Expansion Module

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.

Connection with External Supply

Connection with Datalogger Supply

GND

EXTERNAL

9 TO 18V DC

+ –

SDM-CD16D DATALOGGER

12V C1

SDM-C1 or C1

SDM-C2 or C2

SDM-C3 or C3

12V

SDM-CD16D DATALOGGER

GND

12V

SDM-C1 or C1

SDM-C2 or C2

SDM-C3 or C3

FIGURE 3. Connection Block Diagrams

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

low level analog measurements (thermocouples, pyranometers,

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

slight ground potentials created along the 21X analog terminal

strip when the 12 V supply is used to power peripherals. This

limitation reduces the number of available analog input channels

and may make an external supply for the SDM-CD16D essential.

NOTE

SDM-CD16D 16 Channel Digital Control Port Expansion Module

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 12 V first, followed by ground, then the

control ports.

CAUTION

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

details of how to use the spring-loaded terminals.

TABLE 1. Datalogger to SDM-CD16D Connections

Connection Order

SDM-CD16D

CR800, CR850,

CR1000, CR7,

CR10(X), CR23X, 21X

CR3000,

CR5000

Function

First 12 V 12 V on datalogger or

external supply 12 V on datalogger or

external supply Power

Second

or G

SDM-C1

SDM-C2

SDM-C3

Common Ground

Data

Clock

Enable

On a CR7, SDMs connect to the ports at the upper right corner

of the 700X control module.

NOTE

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 CR7 dataloggers, the total cable length can be up to 180 m.

For our other dataloggers, the total cable length connecting

SDM-CD16Ds to SDM-CD16Ds and the datalogger should not

exceed 6 m. Total cable lengths in excess of 6m will adversely

affect communication performance.

NOTE

4.1 Controlled Device Connections

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

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

common ground connector is provided between each pair of terminals.

SDM-CD16D 16 Channel Digital Control Port Expansion Module

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 9 mm 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

Use a screwdriver in appropriate slot

to release spring tension

Strip insulation

and insert wire

FIGURE 4. Use of Terminal Blocks

5. Address Selection Switches

Each SDM-CD16D can have 1 of 16 addresses. The factory-set address is 00.

Table 2 shows switch position and the corresponding address. Figures 1 and 5

show the position of the switch. Note that you will have to remove the

mounting bracket to gain access to this switch.

SDM-CD16D 16 Channel Digital Control Port Expansion Module

TABLE 2. Switch Position and

Addresses

Switch Setting Base 4 Address

0 00

1 01

2 02

3 03

4 10

5 11

6 12

7 13

8 20

9 21

A 22

B 23

C 30

D 31

E 32

F 33

Use a screwdriver to select address

FIGURE 5. Address Selection Switch

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