Default settings
The metering pump DULCO flex Control DFXa,
DFXa is delivered to the customer with predeter‐
mined settings, with “Bus address 20” and a baud
rate of 19,200 baud.
You can change the slave address and baud rate
in the metering pump DULCO flex Control DFXa,
DFXa in the ‘Settings
è
Modbus RTU’ menu (First
switch the Modbus to ‘inactive’ ).
The Modbus interface is implemented based on the following
standards:
n
www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
Additional information about Modbus can be found at
www.modbus.org
or the websites of your country's Modbus organi‐
sation - if available.
2.5.1 “Modbus RTU” message structure
Parameter Value
Standard RS-485
Number of data bits per character 11 bits:
1 start bit
8 data bits
1 parity bit - “even”
1 stop bit
Data rate (baud) Pre-set: 19200
(9600, 19200, 38400)
Error check CRC-16 (cyclic redundancy check); polynomial =
0x0A001 (1010000000000001
Tab. 25: A telegram comprises:
Component Length
Slave address 1 byte
Function code 1 byte
Data n bytes
CRC check sum 2 bytes
2.5.1.1 Slave address
The slave address can be set between 1 and 247.
Pre-set: 20
Supplementary operating instructions for Modbus RTU
32
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