iSMA-B-W0202 Modbus User Manual
version 1.2
Page 15 / 49
Stop bits (40137)
The number of stop bits is determined on the basis of this register in accordance with the
following table:
Value
No of stop bits
1 (default)
1
2
2
Table 7 Stop bits
Figure 11 Modbus message frame
Data bits (40138)
The number of data bits transmitted in a single byte is determined according to the following
table:
Value
No of data bits
7
7
8 (default)
8
Table 8 Data bits
Parity bit (40139)
Each byte of data being transferred may have additional protection as a parity bit added before
stop bit (bits).
The method of calculating parity bit determines the table below:
Register value
Type of parity bit
0 (default)
none
1
Odd (number of all ones in a byte is odd)
2
Even (number of all ones in a byte is even)
3
Always 1
4
Always 0
Table 9 Parity bit
Response delay time (40140)
The value of this register determines the number of milliseconds to wait before the unit answers