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OPERATION
Menu features:
The DPC200-MOD menu has been extended by four more points.
modbus
1)
ON / OFF
modbus address
2)
1 - 247
Communication baud rate:
The communication baud rate indicates the transmission rate in bits per second. It must
be the same throughout the Modbus network.
Parity check:
The parity check is a method for error detection in binary coded data. With this method a
parity bit is sent with each byte which contains the information of modulo two. The parity
setting must be the same throughout the network.
The DPC200-MOD supports the following parity modes:
none
even
odd
none 2 stop bits
Telegram structure:
A send telegram always consists of two bytes and three words.
Byte = 8bit
Wort = 16bit
8bit
8bit
ID
FC
8bit
8bit
ID = Modbus adress
The telegram is transmitted byte wise, only in the Modbus context, some bytes are
regarded as words.
Function code
The device supports three function codes: 0x03 = read holding register
14
Doc.-no.: DPC200-MOD_02_EN
Modbus func-
tion on and off
device adress /
device ID
No parity check is performed and no additional parity bit is sent.
The parity bit is / must be HIGH, if the preceding byte modulo 2 is
equal to zero.
The parity bit is / must be HIGH, if the preceding byte modulo 2 is
equal to one.
No parity check is made, instead of the parity bit another stop bit
is sent. This mode is suitable for heavily disturbed connections.
11111111
11111111 11111111
8bit
8bit
DA
DA
16bit
FC = function code
DA = data address
modbus baud rate
3)
7200 / 9600 / 14400 /
19200 / 38400 / 57600
modbus parity
4)
none / even / odd /
none 2 stop bits
(U)SINT (Short-Integer)
(U)INT
8bit
8bit
D
D
16bit
D = data
0x04 = read input registers
0x06 = write single register
Issue: 08/2019
communication
baud rate
parity check
(Integer)
8bit
8bit
CRC
CRC
16bit
CRC = checksum