Siemens LMV5 Quick Start Manual page 196

Mapping words
B0 B1 B2 B3
Byte High
Mapping long values
Communication process
Process
Example
LMV5 QSG Rev 4
B4 B5 B6 B7
Transmission mode: The LSB (least significant bit) is transmitted first.
Byte High Byte Low
Word Low
Start and end of a data block are characterized by transmission pauses. The maximum
permissible time between 2 successive characters is 3.5 times the time required for the
transmission of once character.
The character transmission time is dependent on the Baud rate and the data format used.
Having a data format of 8 data bits, no parity bit and one stop, the character transmission
time is calculated as follows:
Character transmission time [ms] = 1000 * 9 bits / Baud rate
And with other data formats:
Character transmission time [ms] = 1000 * 10 bits / Baud rate
Transmission time = n characters * 1000 * x bits / Baud rate
Transmission time = n characters * 1000 * x bits / Baud rate
Marking for data query or end of reply with data format 10 / 9 bits
Waiting time = 3.5 characters * 1000 * x bits / Baud rate
Baud rate [Baud]
9600
Sec 8 Pg 2
B8 B9 B10
Byte High Byte Low
Word High
Data query from the master
Marking for end of data query
3.5 characters * 1000 * x bits / Baud rate
Data query handling by the slave
Reply of slave
Marking for end of reply
3.5 characters * 1000 * x bits / Baud rate
Data format [bit]
10
9
B11 B12 B13 B14
Byte Low
Waiting time [ms]
3.125
2.813
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B15