Communication via RS485
5.4 Communication using Modbus RTU
Fieldbuses
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
131
Baud rates and mapping tables
Permissible baud rates and telegram delay
The Modbus RTU telegram requires pauses for the following situations:
● for the start identifier
● for separating the individual frames
● for the end identifier
Minimum duration: Processing time for 3.5 bytes (can be set via p2024[2]).
A character delay time is also permitted between the individual bytes of a frame. Maximum
duration: Processing time for 1.5 bytes (can be set via p2024[1]).
Table 5- 10 Baud rates, transmission times, and delays
Baud rate in bit/s (p2020)
Transmission time per
character (11 bits)
Minimum pause be-
tween two telegrams
(p2024[2])
Maximum pause be-
tween two bytes
(p2024[1])
9600 1.146 ms ≥ 4.010 ms ≤ 1.719 ms
Note
The factory setting for p2024[1] and p2024[2] is 0. The inverter defines the particular values
depending on the protocol selection (p2030) or the baud rate.
Modbus register and Control Unit parameters
The inverter supports the subsequently listed registers. Error "Exception Code" is output if an
attempt is made to access other registers.
Note
Read and write access to inverter data
R: read via FC03; W: write via FC06; R/W:
read via FC03 or write via FC06
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