FieldServer FS-8700-08 User Manual

APPLICABILITY & EFFECTIVITY

Effective for all systems manufactured after January 2013

Driver Manual

(Supplement to the FieldServer Instruction Manual)

FS-8700-01 Modbus RTU

&

FS-8700-08 Modbus ASCII

There are several similarities between these two drivers and we have

incorporated them into the same manual to ensure that our information

stays current. Although both drivers are referenced in this manual, they are

different drivers and need to be ordered separately."

Driver Version:

4.06

Document Revision:

3

A Sierra Monitor Company

FS-8700-01 Modbus RTU/ASCIIFS-8700-01_Modbus_RTU.doc Driver Manual Table of Contents

TABLE OF CONTENTS

1 Modbus RTU/ Modbus ASCII Description ....................................................................................................... 3

2 Driver Scope of Supply ................................................................................................................................... 3

2.1 Supplied by FieldServer Technologies for this driver ................................................................................... 3

2.2 Provided by Supplier of 3rd Party Equipment ............................................................................................... 3

3 Hardware Connections ................................................................................................................................... 4

4 Data Array Parameters ................................................................................................................................... 5

5 Configuring the FieldServer as a Modbus RTU or Modbus ASCII Client. .......................................................... 6

5.1 Client Side Connection Parameters .............................................................................................................. 6

5.2 Client Side Node Parameters ....................................................................................................................... 7

5.3 Client Side Map Descriptor Parameters ....................................................................................................... 8

5.3.1 FieldServer Related Map Descriptor Parameters ..................................................................................... 8

5.3.2 Driver Related Map Descriptor Parameters ............................................................................................. 8

5.3.3 Timing Parameters ................................................................................................................................... 9

5.3.4 Map Descriptor Examples. ..................................................................................................................... 10

6 Configuring the FieldServer as a Modbus RTU or Modbus ASCII Server ........................................................ 11

6.1 Server Side Connection Parameters ........................................................................................................... 11

6.2 Server Side Node Parameters .................................................................................................................... 12

6.3 Server Side Map Descriptor Parameters .................................................................................................... 13

6.3.1 FieldServer Specific Map Descriptor Parameters ................................................................................... 13

6.3.2 Driver Specific Map Descriptor Parameters ........................................................................................... 13

6.3.3 Map Descriptor Examples ...................................................................................................................... 14

6.3.4 Slave_Id .................................................................................................................................................. 14

Appendix A. Useful Features – Modbus RTU ........................................................................................................ 15

Appendix A.1. Managing Floating points with Modbus ........................................................................................... 15

Appendix A.1.1. Transferring non-integer values with one register ................................................................. 15

Appendix A.1.2. Transferring 32 bit values with two registers ......................................................................... 16

Appendix A.2. Node_Offline_Response................................................................................................................... 16

Appendix B. Troubleshooting ............................................................................................................................... 18

Appendix B.1. Server Configuration of System Station Address.............................................................................. 18

Appendix C. Vendor Information ......................................................................................................................... 19

Appendix C.1. Connection to York Modbus Microgateway ..................................................................................... 19

Appendix C.2. Modbus ASCII - Examples of FieldServer setup for typical clients .................................................... 19

Appendix C.2.1. FieldServer with GE Cimplicity as client .................................................................................. 19

Appendix C.2.2. FieldServer with Intellution FIX as a client .............................................................................. 19

Appendix D. Reference ........................................................................................................................................ 21

Appendix D.1. Data Types ........................................................................................................................................ 21

Appendix D.2. Single Writes .................................................................................................................................... 21

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com

Tel: [phone] Fax: [phone] Toll Free: [phone] email: [e-mail]

FS-8700-01 Modbus RTU/ASCIIFS-8700-01_Modbus_RTU.doc Driver Manual Page 3 of 21

FieldServer Technologies PART #

Description

FS-8915-10

UTP cable (7 foot) for RS-232 use 1

PART #

Description

Modbus RTU or Modbus ASCII device

1

1 MODBUS RTU/ M O D B US ASCII DE SC R I P TION

The Modbus RTU and Modbus ASCII drivers allow the FieldServer to transfer data to and from devices using
Modbus RTU or Modbus ASCII protocol respectively. Data can be transferred over either RS-232 or RS-485. The
driver was developed for Modbus Application Protocol Specification V1.1a" from Modbus-IDA. The specification
can be found at www.modbus.org. The FieldServer can emulate either a Server or Client.

The information that follows describes how to expand upon the factory defaults provided in the configuration files
included with the FieldServer.

There are various register mapping models being followed by various vendors

To cover all these models FieldServer uses the following three Models

 Modicon_5digit – Use this format where addresses are defined in 0xxxx, 1xxxx, 3xxxx or 4xxxx format. A

maximum of 9999 registers can be mapped of each type. This is FieldServer driver’s default format.

 ADU –Application Data Unit address. Use this format where addresses of each type are defined in the

range 1-65536

 PDU –Protocol Data unit address. Use this format where addresses of each type are defined in the range

0-65535.

The key difference between ADU and PDU is for example if Address_Type is ADU and address is 1, the driver will
poll for register 0. If Address_Type is PDU, the driver will poll for address 1.

Note 1: If vendor document shows addresses in extended Modicon (i.e. 6 digit) format like 4xxxxx then consider
these addresses as xxxxx (omit the first digit) and use either ADU or PDU

Note 2: The purpose of providing 3 different ways of addressing the Modbus registers is to allow the user to
choose the addressing system most compatible with the address list being used. At the protocol level, the same
protocol specification is used for all three with the exception of the limited address range for Modicon_5digit.

2 DRIVER SCOPE OF SU P PLY

2.1 Sup plied by FieldSe r v e r Technologies fo r t h i s driver

2.2 Provided by Supplier of 3

rd

Party Equipment

This cable is necessary for connection to the driver. It is shipped with the FieldServer and not separately with the driver.

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com

Tel: [phone] Fax: [phone] Toll Free: [phone] email: [e-mail]

FS-8700-01 Modbus RTU/ASCIIFS-8700-01_Modbus_RTU.doc Driver Manual Page 4 of 21

RJ45 to

RS-232

Connector

Connect

to 2-wire

RS-485

network

OR

RJ45 Connector

Typical DB9/DB25
kit assemblies are
shown here. Refer
to the third party
device literature
for exact
configuration

required.

DB25M

FUNCTION FROM TO COLOUR

Rx RJ45-01 DB9F-03 WHITE

GND RJ45-04 DB9F-05 GREEN

Tx RJ45-08 DB9F-02 BLUE

FUNCTION FROM TO COLOUR

RX RJ45-01 DB25M-03 WHITE
CTS RJ45-02 DB25M-05 BROWN
DSR RJ45-03 YELLOW
GND RJ45-04 DB25M-07 GREEN
GND RJ45-05 RED

TX RJ45-08 DB25M-02 BLUE

RTS RJ45-07 DB25M-04 ORANGE

DTR RJ45-06 BLACK

8917-01 WIRE LIST

FUNCTION FROM TO COLOUR

RX RJ45-01 DB25F-02 WHITE
CTS RJ45-02 DB25F-04 BROWN
DSR RJ45-03 YELLOW
GND RJ45-04 DB25F-07 GREEN
GND RJ45-05 RED

TX RJ45-08 DB25F-03 BLUE

RTS RJ45-07 DB25F-05 ORANGE

DTR RJ45-06 BLACK

8917-04 WIRE LIST

DB25F

DB9M

FUNCTION FROM TO COLOUR

RX RJ45-01 DB9M-02 GREY
CTS RJ45-02 DB9M08 BROWN
DSR RJ45-03 DB9M-06 YELLOW
GND RJ45-04 DB9M-05 GREEN
GND RJ45-05 RED

TX RJ45-08 DB9M-03 BLUE

RTS RJ45-07 DB9M-07 ORANGE

DTR RJ45-06 DB9M-04 BLACK

8917-03 WIRE LIST

BASE NAME:
FILE NAME:

FIELDSERVER

GENERIC

CONNECTION DIAGRAM

DATE: 8/16/05
BY: MC

(408)-262-2299

DB9F

8917-02 WIRE LIST

PLC

Ethernet Interface

FS-8915-10

FS-8915-10

Site Ethernet

2

3 HARDWARE C O N N E CT ION S

It is possible to connect a Modbus RTU or Modbus ASCII device to any of the existing serial ports on the
FieldServer2. These ports simply need to be configured for the appropriate driver in the configuration file.

Configure the Modbus RTU or Modbus ASCII device according to manufacturer’s instructions.

Not all ports shown are necessarily supported by the hardware. Consult the appropriate Instruction manual for details of the ports available

on specific hardware.

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com

Tel: [phone] Fax: [phone] Toll Free: [phone] email: [e-mail]

FS-8700-01 Modbus RTU/ASCIIFS-8700-01_Modbus_RTU.doc Driver Manual Page 5 of 21

Section Title

Data_Arrays

Column Title

Function

Legal Values

Data_Array_Name

Provide name for Data Array

Up to 15 alphanumeric characters

Data_Array_Format

Provide data format. Each Data Array can only take
on one format.

FLOAT, BIT, UInt16, SInt16,
Packed_Bit, Byte, Packed_Byte,
Swapped_Byte

Data_Array_Length

Number of Data Objects. Must be larger than the
data storage area required by the Map Descriptors
for the data being placed in this array.

1-10, 000
// Data Arrays

Data_Arrays

Data_Array_Name

, Data_Array_Format

, Data_Array_Length

DA_AI_01

, UInt16

, 200

DA_AO_01

, UInt16

, 200

DA_DI_01

, Bit

, 200

DA_DO_01

, Bit

, 200

4 DATA A R R AY PARAMETERS

Data Arrays are “protocol neutral” data buffers for storage of data to be passed between protocols. It is necessary

to declare the data format of each of the Data Arrays to facilitate correct storage of the relevant data.

Example

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com

Tel: [phone] Fax: [phone] Toll Free: [phone] email: [e-mail]

FS-8700-01 Modbus RTU/ASCIIFS-8700-01_Modbus_RTU.doc Driver Manual Page 6 of 21

Section Title

Connections

Column Title

Function

Legal Values

Port

Specify which port the device is connected to the FieldServer

P1-P8, R1-R23

Baud*

Specify baud rate

110 – 115200, standard baud
rates only. 9600

Parity*

Specify parity

Even, Odd, None

Data_Bits*

Specify data bits

7, 8

Stop_Bits*

Specify stop bits

1,2

Protocol

Specify protocol used

Modbus RTU

Modbus _RTU

Modbus ASCII

MB_ASCII

Poll_Delay*

Time between internal polls

0-32000s, 0.05s

// Client Side Connections

Connections

Port

, Baud

, Parity

, Data_Bits

, Stop_Bits

, Protocol

, Handshaking

, Poll_Delay

P1

, 9600

, None

, 8

, 1

, Modbus _RTU4

, None

, 0.100s

3

4

5 CONFIGUR I N G T HE FIELDSERVER A S A M O DBUS RTU OR MODB U S A SCII CLIENT.

For a detailed discussion on FieldServer configuration, please refer to the FieldServer Configuration Manual. The
information that follows describes how to expand upon the factory defaults provided in the configuration files
included with the FieldServer (See “.csv” sample files provided with the FieldServer).

This section documents and describes the parameters necessary for configuring the FieldServer to communicate
with a Modbus RTU or Modbus ASCII Server.

5.1 Client Side Connect ion Parameters

Example

Not all ports shown are necessarily supported by the hardware. Consult the appropriate Instruction manual for details of the ports available

on specific hardware.

Change protocol to MB_ASCII to use Modbus ASCII protocol

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com

Tel: [phone] Fax: [phone] Toll Free: [phone] email: [e-mail]

FS-8700-01 Modbus RTU/ASCIIFS-8700-01_Modbus_RTU.doc Driver Manual Page 7 of 21

Section Title

Nodes

Column Title

Function

Legal Values

Node_Name

Provide name for Node

Up to 32 alphanumeric
characters

Node_ID

Modbus station address of physical Server Node

1-255

Protocol

Specify protocol used

Modbus RTU

Modbus_RTU

Modbus ASCII

MB_ASCII

Port

Specify which port the device is connected to the FieldServer

P1-P8, R1-R2

3

Address_Type5

Specify Register Mapping Model

ADU,PDU, -,

Modicon_5digit

Write_Fnc*

Set to Multiple if Remote Server Node only supports Write Multiple
function code 15 & 16

Multiple, -,

Write_Length*

Set to Map Descriptor Length if write-thru operation should write
all registers as specified by Map Descriptor length.
By default write-thru writes a single register.
If Write_Length also specified on Map Descriptor, Map Descriptor’s
parameter will be used.

Map Descriptor Length, -,
1,

// Client Side Nodes

// For devices where 65536 addresses are available in each memory area.

Nodes

Node_Name

, Node_ID

, Protocol

, Port

,Address_Type

Modbus device 1

, 1

, Modbus _RTU6

, P1

,ADU

Modbus device 2

, 2

, Modbus_RTU

, P1

,PDU

// For devices where only 9999 registers are available in each memory area.

Nodes

Node_Name

, Node_ID

, Protocol

, Port

Modbus device 3

, 3

, Modbus_RTU

, P1

5

6

5.2 Client Side Node P a r a m eters

Example:

Optional for Modicon 5 digit devices
Change protocol to MB_ASCII to use Modbus ASCII protocol

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com

Tel: [phone] Fax: [phone] Toll Free: [phone] email: [e-mail]