Campbell SDM-CD16D Spécifications télécharger pdf (Page 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.

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

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Campbell SDM-CD16D Spécifications Page 5