Introduction; Control Specifications; General; Sdm-Cd16D - Campbell SDM-CD16D User Manual

16 channel digital control port expansion module

Hide thumbs Also See for SDM-CD16D:

Table of Contents

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.

1. Introduction

NOTE

Figure 1 SDM-CD16D

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.

Compatible dataloggers:

Operating voltage:

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

Total cable length:

CR10/10X, CR23X, CR7 and 21X

12V DC nominal (9 to 18V)

6m (CR10/10X, CR23X, 21X), 180m (CR7)

Table of Contents