Bronkhorst Modbus slave interface - Manual (Page 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 1 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).
Page 16 Modbus interface 9.17.035