ECOLAB Versatronic Modbus Beschreibung Seite 138

Modbus over a serial interface
Character transmission time
The beginning and end of a data block are identified by pauses in transmission.
The character transmission time (time to transmit one character) depends on the baud
rate and the data format used. The following results for a data format of 8 data bits, no
parity bit, and one stop bit:
The following results for a data format of 8 data bits, no parity bit, and one stop bit:
Character transmission time [ms] = 1000 × 9 bits ÷ baud rate
For other data formats, the following is the result:
Character transmission time [ms] = 1000 × 10 bits ÷ baud rate
Example
Identifier for end of data query or response for data format 10/9 bits
Waiting period = 3 characters * 1000 * 10 bits ÷ baud rate
Baud rate [Baud] Data format [Bit]
38400
19200
9600
417102397 Rev. 1-10.2019
Character transmission time[ms]
10
9
10
9
10
9
38
0,260
0,234
0,521
0,469
1,042
0,938