User`s guide

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MultiMux

Multiplexer

USER’S GUIDE

Disclaimer: The following document is provided to assist users with the installation, operation

and training in the use of our products. This document and our products are intended to be used

by technically qualified personnel. Contained herein is information that is proprietary to Canary

Systems and may not be reproduced or copied in any form, nor disclosed to outside parties by

any means whether directly or indirectly, without the written consent of Canary Systems. This

document is subject to change without notice and Canary Systems assumes no responsibility for

errors, omissions or misinterpretation. Furthermore Canary Systems makes no warranty as to the

suitability of this information and/or products for any given application or use.

Multimux_usersguide.doc Revision D, 07-07

Canary Systems, Inc.

75 Newport Road, Suite 211

New London, NH 03257 USA

Voice: (603) 526-9800

Fax: (603) 526-9004

e-mail: support@canarysystems.com

web: www.canarysystems.com

Summary of content (14 pages)

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MultiMux Multiplexer USER’S GUIDE Disclaimer: The following document is provided to assist users with the installation, operation and training in the use of our products. This document and our products are intended to be used by technically qualified personnel. Contained herein is information that is proprietary to Canary Systems and may not be reproduced or copied in any form, nor disclosed to outside parties by any means whether directly or indirectly, without the written consent of Canary Systems.
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Table of Contents Section 1 Introduction 1.1 Overview........................................................................................ 3 1.2 Specifications................................................................................. 4 Section 2 MultiMux Operation and Installation 2.1 Operation Details ........................................................................... 2.2 Datalogger Connection .................................................................. 2.3 Instrument Connection ...
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Section 1 - Introduction 3 1.1 Overview The MultiMux expands the number of instruments that may be read by the CR10 or CR10X in increments of 16, 32 or 48, depending on the model purchased and the type of sensor being read. In addition the MultiMux provides integral lightning protection by utilizing plasma surge arrestors (optional). The MultiMux may be purchased installed in a NEMA 4X fiberglass/polyester enclosure or as a board assembly for users supplying their own packaging.
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Section 1 - Introduction 4 1.
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Section 2 – MultiMux Operation and Installation 5 2.1 Operation Details The MultiMux is controlled by the CR10 or CR10X Controller using 2 digital control signals. The operation of the MultiMux is simple enough so that virtually any device capable of controlling 2 digital TTL/CMOS type signals can be used to control the multiplexer. Generally speaking the timing diagram depicted below describes how the 2 digital signals are used to control the MultiMux. Note: Timing values shown are minimum values.
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Section 2 – MultiMux Operation and Installation 6 2.2 Datalogger Connection The MultiMux is connected to the CR10/CR10X Controller or MultiLogger Mux Terminal Board (or ML MUX TB) using the screw terminals on the terminal board. The screw terminal block located on the bottom of the terminal board has the following connections: The table below lists the connections for the screw terminal block.
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Section 2 – MultiMux Operation and Installation 7 2.3 Instrument Connection The way instruments are connected to the MultiMux will vary slightly depending on the Mode selection (section 2.1). The following table illustrates typical connection techniques for each of the operating modes.
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Section 2 – MultiMux Operation and Installation 8 2.5 CR10/CR10X Program Example The following example illustrates how to write custom programs for the CR10/CR10X to read instruments connected to the MultiMux. The example assumes a 16 Channel Mode MultiMux reading 16 vibrating wire gages and their respective thermistors. The program example illustrates how measurements of instruments connected to the MultiMux are read, it does not include instructions that would store the measurements for later retrieval.
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Section 2 – MultiMux Operation and Installation 9 2.
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Section 2 – MultiMux Operation and Installation SerialOut (Com3,"P0400 3500 0600 0040 0300"+CHR(13),"",0,0) 'Short delay Delay (0,200,mSec) 'Clear buffer SerialFlush(Com3) 'Send VA measurement command SerialOut (Com3,"VA"+CHR(13),"",0,0) 'Configure serial input for receiving response SerialIn(sInBuf,Com3,1500,-1,30) 'Check if enough characters received if Len(sInBuf) >= 30 then 'Process response Splitstr(ScratchLoc(),sInBuf," ",4,0) 'Convert to digits ScratchLoc(5) = 1/((((ScratchLoc(3) * 65536) + ScratchLo
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Section 2 – MultiMux Operation and Installation 11 2.8 Enclosure Installation The standard enclosure for the MultiMux is a Hoffman 12x10 fiberglass/polyester NEMA 4 type. The enclosure can be mounted to a wall or other surface by attaching the 4 supplied mounting tabs to the bottom of the enclosure using the supplied screws. The placement of the mounting holes is depicted in the illustration below. Mounting Hole (4 places)  8.00" (203 mm) 12.94" (329 mm) 12.5" (318 mm) Earth Ground Lug 10.
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Section 2 – MultiMux Operation and Installation 12 2.10 DaisyMux Operation DaisyMux is a special operation mode where all of the signals are shared between 2 or more multiplexers. The MultiMux supports up to 8 multiplexers used in a DaisyMux configuration and the switching mode is ALWAYS 16 Channel. The advantage with the DaisyMux configuration is that a single cable may be used to connect a string of MultiMux multiplexers together, as shown in the diagram below.
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Section 2 – MultiMux Operation and Installation 13 MultiLogger Software Configuration Multiplexers are configured using the Program | Multiplexers form, as illustrated. To configure DaisyMux operation you would simply specify an Enable port that matches all of the multiplexers in the series. For example, multiplexer #2 would be configured as shown below.
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Section 3 – Troubleshooting 14 3.1 Troubleshooting Flowchart If you cannot obtain readings using the MultiMux or the readings are unstable then see the troubleshooting flowchart below for help in determining the nature of the problem.