Timing Sequence For Communication - JUMO LOGOSCREEN nt Interface Description

4 Modbus protocol description

4.3 Timing sequence for communication

Character
transmission
time
Example
Timing
sequence
16
The start and end of a data block are marked by transmission pauses. The
character transmission time (the time taken to transmit one character)
depends on the baud rate and the data format that is used.
For a data format with 8 data bits, no parity bit and one stop bit, this is:
character transmission time [msec] = 1000 * 9 bits / (baud rate)
For the other data formats it is:
character transmission time [msec] = 1000 * 10 bits / (baud rate)
Baud rate [bps]
38400
19200
9600
A data request runs according to the following timing sequence:
t Internal waiting time of the paperless recorder before checking the
1
data request, and the internal processing time.
min.:
typical:
max.:
Data format [bit]
10
9
10
9
10
9
5 msec
5 — 45 msec
60 msec, or the preset "minimum response time"
Character transmission
time [msec]
0.260
0.234
0.521
0.469
1.042
0.938