Bronkhorst Modbus slave interface Bedienungsanleitung PDF herunterladen (Seite 16)

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4 FUNCTIONAL DESCRIPTION

4.1 General

The information found here is the basic information needed for the installation of a Modbus system.

The implementation of the Modbus interface is based on the following standards:

[1] Modbus_Application_Protocol_V1_1b.pdf December 28, 2006

[2] Modbus_over_serial_line_V1_02.pdf December 20, 2006

4.2 Implementation class

The physical and data link layer are implemented conforming to the "basic slave" implementation class as described in

document [2] “MODBUS over Serial Line specification and implementation guide V1.02”.

The following options have been implemented:

General settings

parameter

options

remarks

addressing

address configurable from 1 to 247 (default 1)

broadcast support

yes

baud rate

9600

19200 (default)

38400

57600 Baud (MBC3 type only)

115200 Baud (MBC3 type only)

electrical interface

RS485 2W-cabling

data bits

RTU = 8, ASCII = 7

stop bits

The use of no parity requires 2 stop bits

MBCII / CORI-FLOW / M+W

parameter

options

remarks

parity

even

Not configurable

transmission mode

RTU

Not configurable

MBC3 / EL-FLOW Base

parameter

options

remarks

parity

even / odd / none

Configurable

transmission mode

RTU / ASCII

Configurable (MBC3)

Auto detection (EL-FLOW Base)

MASS-VIEW

parameter

options

remarks

parity

even

Not configurable

transmission mode

RTU / ASCII

Configurable

More detailed information about Modbus can be found at www.modbus.org or any website of the

(local) Modbus organisation of your country (when available).

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