Daniel Multidrop Communications Adapter Owner's manual

MULTIDROP

COMMUNICATIONS

ADAPTER

__________________________________________

DANIEL MEASUREMENT AND CONTROL

HOUSTON, TEXAS

Part Number: 3-9000-513

REVISION F

October 1995

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

DANIEL INDUSTRIES, INC.

MULTIDROP COMMUNICATIONS ADAPTER (MCA)

SOLARFLOW PLUS MODELS 2460, 2470

REFERENCE GUIDE

NOTICE

DANIEL INDUSTRIES, INC. AND DANIEL MEASUREMENT AND CONTROL ("DANIEL")

SHALL NOT BE LIABLE FOR TECHNICAL OR EDITORIAL ERRORS IN THIS MANUAL

OR OMISSIONS FROM THIS MANUAL. DANIEL MAKES NO WARRANTIES, EXPRESS

OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY

AND FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THIS MANUAL

AND, IN NO EVENT, SHALL DANIEL BE LIABLE FOR ANY SPECIAL OR

CONSEQUENTIAL DAMAGES INCLUDING, BUT NOT LIMITED TO, LOSS OF

PRODUCTION, LOSS OF PROFITS, ETC.

PRODUCT NAMES USED HEREIN ARE FOR MANUFACTURER OR SUPPLIER

IDENTIFICATION ONLY AND MAY BE TRADEMARKS/REGISTERED TRADEMARKS OF

THESE COMPANIES.

BY DANIEL MEASUREMENT AND CONTROL

HOUSTON, TEXAS, U.S.A.

copied in any form or by any means - graphic, electronic or

mechanical - without first receiving the written permission of

Daniel Measurement and Control, Houston, Texas, U.S.A.

PREFACE i

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

WARRANTY

Daniel Measurement and Control ("Daniel") warrants all equipment manufactured by it to be free

from defects in workmanship and material, provided that such equipment was properly selected

for the service intended, properly installed, and not misused. Equipment which is returned,

transportation prepaid to Daniel within twelve (12) months of the date of shipment (eighteen (18)

months from date of shipment for destinations outside of the United States), which is found after

inspection by Daniel to be defective in workmanship or material, will be repaired or replaced at

Daniel’s sole option, free of charge, and return-shipped at lowest cost transportation. All

transportation charges and export fees will be billed to the customer. Warranties on devices

purchased from third party manufacturers not bearing a Daniel label shall have the warranty

provided by the third party manufacturer.

Extended warranty - Models 2470, 2480 and 2500 are warranted for a maximum of twenty-four

(24) months. The Danalyzer valves are warranted for the life of the instrument and the columns

for five years.

The warranties specified herein are in lieu of any and all other warranties, express or implied,

including any warranty of merchantability or fitness for a particular purpose.

Daniel shall be liable only for loss or damage directly caused by its sole negligence. Daniel’s

liability for any loss or damage arising out of, connected with, or resulting from any breach

hereof shall in no case exceed the price allocable to the equipment or unit thereof which gives

rise to the claim. Daniel’s liability shall terminate one year after the delivery of the equipment

except for overseas deliveries and extended warranty products as noted above.

In no event, whether as a result of breach of warranty or alleged negligence, shall Daniel be

liable for special or consequential damages, including, but not limited to, loss of profits or

revenue; loss of equipment or any associated equipment; cost of capital; cost of substitute

equipment, facilities or services; downtime costs; or claims of customers of the purchaser for

such damages.

ii PREFACE

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

TABLE OF CONTENTS

Section Page

SECTION 1 INTRODUCTION

1.0 INTRODUCTION ..........................................1-1

SECTION 2 COMMUNICATIONS INTERFACE

2.0 COMMUNICATIONS INTERFACE .............................2-1

2.1 MCA/HOST COMMUNICATIONS INTERFACE ...................2-1

2.1.1 MCA/Host Communications Protocol ...........................2-1

2.1.2 MCA/Host Interconnection Cables ..............................2-2

2.2 NETWORK INTERCONNECTION .............................2-3

2.2.1 Network Communications Protocol .............................2-3

2.2.2 Network Interconnection Cables ...............................2-4

SECTION 3 ELECTRICAL POWER

3.0 ELECTRICAL POWER ......................................3-1

3.1 HOST POWER SYSTEM .....................................3-1

3.1.1 Host-Supplied Power .......................................3-1

3.1.2 Isolated Power Supply ......................................3-2

3.1.3 Host System Power Characteristics .............................3-2

3.2 NETWORK POWER SYSTEM ................................3-3

3.2.1 MCA Configuration Plug ....................................3-3

3.2.2 Primary Slave MCA .......................................3-3

3.2.3 Network Power Distribution ..................................3-3

3.2.4 Network System Power Characteristics ..........................3-4

SECTION 4 HARDWARE

4.0 CIRCUITRY ..............................................4-1

4.1 INTRINSIC SAFETY ........................................4-1

4.2 SAFE AREA INTERFACE ....................................4-1

TABLE OF CONTENTS iii

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

4.3 OPERATING AND STORAGE ENVIRONMENT ...................4-1

4.4 SPARE PARTS LIST ........................................4-2

SECTION 5 INSTALLATION

5.0 INSTALLATION IN A SOLARFLOW PLUS ENCLOSURE ...........5-1

5.1 INSTALLATION KIT .......................................5-1

5.2 INSTALLATION PROCEDURE ...............................5-2

5.2.1 Model 2460 SolarFlow Plus/MCA Installation

in the Original Enclosure .................................5-3

5.2.2 Model 2460 SolarFlow Plus/MCA Installation

in a Model 2470 Enclosure ................................5-5

5.2.3 Model 2470 SolarFlow Plus/MCA Installation ..................5-7

5.3 SAFE AREA INTERFACT (SAI) INSTALLATION INSTRUCTIONS ....5-8

5.4 INSTALLATION WITH HAYES MODEM ........................5-8

APPENDICES

Appendix A Hayes 1200 Model Settings for MCA Interface ................. A-1

Appendix B Drawings ........................................... B-1

iv TABLE OF CONTENTS

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

SECTION 1

INTRODUCTION

1.0 INTRODUCTION

The Multidrop Communications Adaptor (MCA) links SolarFlow Plus units in a network that

shares a common radio, modem, or other serial device. A separate MCA module is attached to

each SolarFlow Plus unit in the network and to the device shared by the SolarFlow Plus units.

The MCA modules are linked by a proprietary network interface. The network interface is

designed for low power, intrinsicallly safe operation in electrically hostile environments. An

MCA network can include as many as four SolarFlow Plus units and one shared device.

WARNING: Underwriters’ Laboratories (UL) approval of the

MCA as an intrinsically safe device specifies that no

communications device other than the HHDT may share a serial

port with the MCA and maintain intrinsic safety approval.

Specifically, the MCA may not be used with a radio interface, a

modem interface, or similar devices that share a serial port.

The MCA module is suitable for operation with SolarFlow Plus Models 2460 and 2470.

The SolarFlow Plus unit or shared device communicates with the MCA attached to it through an

RS-232 compatible serial port. The MCA converts the RS-232 signals to and from network

levels. The SolarFlow Plus unit and shared device communicate full duplex over the network

established by the MCA at rates up to 1200 baud. The network can accommodate cables up to

1000 feet in length between SolarFlow Plus units and the shared device.

SECTION 1 1-1

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

This page intentionally left blank.

1-2 INTRODUCTION

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

SECTION 2

COMMUNICATIONS INTERFACE

2.0 COMMUNICATIONS INTERFACE

A SolarFlow Plus/MCA network can include as many as four SolarFlow Plus units and one

shared device. Each of the SolarFlow Plus units and the shared device must have an individual

Multidrop Communications Adaptor (MCA) connected to it. The network interconnects each

individual MCA.

2.1 MCA/HOST COMMUNICATIONS INTERFACE

Either a SolarFlow Plus unit or shared device is designated the host. If a SolarFlow Plus unit

is the host, the unit communicates with the MCA attached to it through the same serial channel

provided for Hand Held Data Terminal (HHDT) communications. When a HHDT cable is

connected to a SolarFlow Plus unit, the MCA releases the serial port to the HHDT and

communications between the SolarFlow Plus unit and the shared network device are interrupted.

However communications between the shared device and the other SolarFlow Plus units in the

network are not affected. Communication signals between a SolarFlow Plus unit (or shared

device) and the MCA are protected against electrical transients.

2.1.1 MCA/Host Communications Protocol

RS-232 compatible communications protocol is used for data transmission between an MCA and

the host SolarFlow Plus (or shared device).

The host protocol has the following characteristics:

Signal levels:

Mark (1) exceeds -3.0 volts (V) (nominally -5V)

Space (0) exceeds 3.0V (nominally 5V)

SECTION 2 2-1

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

Maximum cable length between an MCA and an associated SolarFlow Plus unit (or

shared device) is 50 feet.

Full duplex

Maximum Baud rate: 1200

Defined signals:

a. RS-232 signals:

GND Power supply and signal return from SolarFlow Plus

CTS Clear to send input from SolarFlow Plus or shared device

RXD Receive data input from SolarFlow Plus or shared device

RTS Request-to-Send output to SolarFlow Plus or shared device

TXD Transmit data output to SolarFlow Plus or shared device

b. Non RS-232 signals:

HHDT Input, which indicates that the HHDT cable is connected to the

SolarFlow Plus

PWR Input power for the host side of the isolated interface

DO 1000-ohm resistor-to-ground output that indicates to SolarFlow Plus

that a device is connected

2.1.2 MCA/Host Interconnection Cables

Cables for connecting the MCA to host units (SolarFlow Plus units or shared device) must have

the following characteristics when the MCA is not mounted in the same enclosure as the host

unit.

- Eight conductor with overall shield

- Length: maximum of 50 feet

- Capacitance (conductor-to-conductor or conductor-to-shield): 0.05uF maximum

- Inductance: 10uH maximum (0.2uH/Foot)

- Size: 20 American Wire Gauge (AWG) minimum, 18 AWG maximum

- Voltage rating: 600V

2-2 COMMUNICATIONS INTERFACE

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

2.2 NETWORK INTERCONNECTION

Individual MCA modules are connected to each SolarFlow Plus unit and to the shared network

device. A network can accommodate up to four SolarFlow Plus units and one shared device (for

a maximum of five MCA modules).

2.2.1 Network Communications Protocol

The network protocol has the following characteristics:

Maximum total cable length in the network is 1000 feet.

Defined signals:

NRET Network power supply and signal return input

NRTS Network Request-to-Send output

NVMID Reference voltage equal to half the network power supply voltage

NTXD Network Transmit-Data output

NPWR Network power input

NCTS Network Clear-to-Send input

NRXD Network Receive-Data input from SolarFlow Plus or shared device

SHIELD Cable shield connection to local earth ground

Full duplex

Maximum Baud rate: 1200

SECTION 2 2-3

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

2.2.2 Network Interconnection Cables

Network interconnection cables are furnished by the user and must have the following

characteristics.

- Six twisted pairs (12-conductor with overall shield)

- Length: 1000 feet (maximum total of all drops)

- Capacitance (conductor-to-conductor or conductor-to-shield: 0.05uF maximum

- Inductance: 200uH maximum (0.2uH/Foot)

- Size: 20 AWG minimum, 18 AWG maximum

- Voltage rating: 600V

2-4 COMMUNICATIONS INTERFACE

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

SECTION 3

ELECTRICAL POWER

3.0 ELECTRICAL POWER

The Multidrop Communications Adaptor (MCA) is designed with two separate electrical

power/ground systems: the host system and the network system. Except for one host/MCA unit,

which supplies power to the network system, all host and network power/ground systems are

isolated. Because the systems are isolated, MCA modules can be connected to host units

regardless of ground differences among the various sites. This prevents network communication

errors caused by ground currents. All power connections are isolated against transient voltages.

3.1 HOST POWER SYSTEM

3.1.1 Host-Supplied Power

In normal installations, each MCA host power system receives electrical power from its host unit

and has a common ground with the host unit through the host/MCA interface.

As noted above, all host and network power/ground systems are isolated except for the host/MCA

unit that supplies power to the network system. The network system is described in paragraph

3.2.

SECTION 3 3-1

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

3.1.2 Isolated Power Supply

An MCA isolated power supply (IPS) (Daniel part number 3-0004-106) is available for

installations where suitable power for the MCA host power system is not available from the host

device. The IPS connects to Jack J2 on the MCA printed circuit assembly (PCA) and converts

network power to the isolated MCA host power system.

3.1.3 Host System Power Characteristics

Power for individual MCA modules is supplied by the SolarFlow Plus unit (or the shared device)

to which the MCA is connected. The host power system characteristics are provided below.

Source impedance: 10 ohms maximum

Input voltage: 9 volts minimum

15 volts maximum

Quiescent current: Typically 0.3mA at 80

o

F (1mA maximum)

(CTS low, NCTS high)

Active current: Typically 10mA, 12mA maximum

(CTS high, NCTS low, TXD and RXD active at 1200 baud)

3-2 ELECTRICAL POWER

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

3.2 NETWORK POWER SYSTEM

3.2.1 MCA Configuration Plug

Network power is supplied from one of the SolarFlow Plus units through an MCA configuration

plug (Daniel part number 3-0004-105), which is installed in an MCA associated with one of the

SolarFlow Plus units. The configuration plug is installed in only one MCA in the system. The

configuration plug connects the host and network power systems and provides power and the

ground reference to the MCA network. Once connected, the network interfaces of all MCA

modules in the system draw power from the battery of that SolarFlow Plus unit and are grounded

through that SolarFlow Plus unit.

3.2.2 Primary Slave MCA

The MCA module fitted with the configuration plug is designated the primary slave. Any MCA

in the system can serve as the primary slave (including the shared device). Another primary

slave can be selected by moving the configuration plug to another unit.

3.2.3 Network Power Distribution

Network power and ground (NPWR and NRET) pass through a wire pair of the network cable

and provide power and ground reference for the MCA network transmitters and receivers.

Network ground is also paired with each of the network control signals (NRTS and NCTS). An

extra wire carries power (NPWR) in order to reduce resistance due to long cable runs. The

network cable shields are connected to earth ground at each MCA.

SECTION 3 3-3

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

3.2.4 Network System Power Characteristics

The network system power characteristics are provided as follows. Maximum configuration is

for four MCA-equipped SolarFlow Plus units and a master shared device using an MCA isolated

power supply. The recommended maximum duty cycle for the MCA network is 10 percent (or

2.4 hours of network communication activity per day) to avoid an excessive drain on the battery

of the primary slave SolarFlow Plus unit.

Source impedance: 10 ohms maximum

(SolarFlow Plus battery current limit plus cable resistance)

Input voltage: 9 volts minimum

15 volts maximum

Quiescent current: Typically 12mA at 80

o

F, 16mA maximum

(CTS low, NCTS high)

Active current: Typically 43mA at 80

o

F, 60mA maximum

(CTS high, NCTS low, TXD and RXD active at 1200 baud)

3-4 ELECTRICAL POWER

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

SECTION 4

HARDWARE

4.0 CIRCUITRY

All Multidrop Communications Adapter (MCA) circuity is mounted on a single printed circuit

board (PCB).

4.1 INTRINSIC SAFETY

The MCA is designed to meet the following intrinsic safety standard when installed in

accordance with the field wiring diagrams provided in Appendix B.

Underwriters Laboratories Standard 913

Class I, Div 1, Gp D

All MCA modules installed in hazardous areas must be mounted inside the SolarFlow Plus

enclosure in accordance with the procedures in Section 5. Kits are available for mounting MCA

modules inside the SolarFlow unit.

4.2 SAFE AREA INTERFACE

The MCA safe area interface provides for connecting MCA modules in safe areas to those

installed in hazardous areas. The safe area interface is supplied in a weather-proof enclosure.

4.3 OPERATING AND STORAGE ENVIRONMENT

The MCA is designed to operate in the following physical environment.

Relative humidity: Between zero and 95 percent (noncondensing)

Operating temperature range: -20

o

Fto160

o

F

Storage temperature range: -40

o

Fto160

o

F

SECTION 4 4-1

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

4.4 SPARE PARTS LIST

The following is a list of the spare parts recommeded for the MCA.

Quantity (per Network) Description Part Number

1

MCA printed circuit assembly

MCA isolated power supply

Intrinsic safety barrier

3-0004-010

3-0004-106

9-9020-372

4-2 HARDWARE

MULTIDROP COMMUNICATIONS ADAPTER ____________________________________

OCT 1995

SECTION 5

INSTALLATION

5.0 INSTALLATION IN A SOLARFLOW PLUS ENCLOSURE

This section of the manual provides information necessary for proper installation of the Multidrop

Communications Adaptor (MCA) inside Models 2460 or 2470 SolarFlow Plus enclosures.

Model 2460 SolarFlow PLUS may be installed either with or without termination boards. The

system wiring diagrams and the installation drawings are provided in Appendix B.

There are three different installation drawings:

DE-11378 (Model 2460 in original enclosure)

DE-11965 (Model 2460 in 2470 enclosure)

DE-11962 (Model 2470)

Use the installation drawing for your instrument. To determine if your Model 2460 SolarFlow

has the original Model 2460 enclosure or was built with a Model 2470 enclosure, check the

mounting of the door hinge to the enclosure. The original Model 2460 enclosure had the door

hinge mounted to the right side of the enclosure. While the Model 2460 in the Model 2470

enclosure has the door hinge mounted to the right front edge of the enclosure.

5.1 INSTALLATION KIT

The MCA Kit (Daniel P/N 3-0004-113) includes the MCA printed circuit assembly (PCA)

mounted on an "L" bracket ready to be installed in a Model 2470 or a Model 2460 with a Model

2470 enclosure. If your unit is a Model 2460 in the original enclosure you need to replace the

"L" bracket on the PCA with the flat bracket (P/N 4-0004-008) supplied with the kit.

SECTION 5 5-1

_________________________________ MULTIDROP COMMUNICATIONS ADAPTER

OCT 1995

In addition to the MCA PC Assembly, the installation kit contains the following items:

3 Threaded Hex spacers 3/4" (P/N 4-9119-075)*

3 No. 10 screws 3/8" (P/N 4-9202-906)*

3 No. 10 screws 5/8" (P/N 4-9202-910)**

1 Flat Plate bracket (P/N 4-0004-008)*

3 No. 10 lock washers (P/N 4-9231-102)*

7" Gasket tape (P/N 4-9241-001)**

6 Cable ties (P/N 4-9158-002)

1 Cable tie base (P/N 4-9158-901)

1 Butt splice (P/N 4-9154-900)

* Required only for Model 2460 in original enclosure installation

** Required only for Model 2470 and Model 2460 in Model 2470 enclosure installation

The cable required to interconnect the individual SolarFlow Plus units is user-furnished and

should meet the requirements given in paragraph 2.2.2.

5.2 INSTALLATION PROCEDURE

WARNING: When installing the MCA, bear in mind that

Underwriters’ Laboratories (UL) approval of the MCA as an

intrinsically safe device specifies that no communications device

other than the HHDT may share a serial port with the MCA and

maintain intrinsic safety approval. Specifically, the MCA may not

be used with a radio interface, a modem interface, or similar

devices that share a serial port.

5-2 INSTALLATION

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Daniel Multidrop Communications Adapter Owner's manual

Daniel Multidrop Communications Adapter Owner's manual

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