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Serial communication protocols
Modbus > Parameter data of Modbus
PROTOCOL
OPTION3: Character frame
Data bits
Parity
Stop bits
OPTION4: Slave address
76
Protocol, which is to be used. This setting influences the structure.
Range of values with Modbus:
0Ah:
Modbus Master ASCII
0Bh:
Modbus RTU
0Ch:
Modbus Slave ASCII short
0Dh:
Modbus Slave RTU short
1Ch:
Modbus Slave ASCII long
1Dh:
Modbus Slave RTU long
Default: 0Bh
n
Byte
Bit 7 ... 0
0
n
Bit 1, 0: Data bits
–
00b = 5 Data bits
–
01b = 6 Data bits
–
10b = 7 Data bits
–
11b = 8 Data bits
Bit 3, 2: Parity
n
–
00b = none
–
01b = odd
–
10b = even
–
11b = even
n
Bit 5, 4: Stop bits
–
01b = 1
–
10b = 1,5
–
11b = 2
n
Bit 7, 6: reserved
n
Default: 13h
–
(Data bits: 8, Parity: none, Stop bit: 1)
Number of bits onto which a character is mapped.
For the purposes of the parity check, the information bits are expanded by the parity bit.
The value of the parity bit ("0" or "1") completes the value of all the bits to obtain a pre-
arranged state. If the parity was not specified, the parity bit is set to "1" but it is not evalu-
ated.
The stop bits are appended to each character and signify the end of the character.
Enter in the Modbus slave protocol an address for the Modbus slave. By means of this
address a Modbus slave may be accessed with the Modbus function codes. With Modbus
master this parameter is ignored.
Range of values: 1 ... 255
n
Default: 1
VIPA System SLIO
HB300 | CP | 040-1CA00 | en | 18-28
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