Modbus Rtu

How can I control ATV31 via the Modbus communication channel?
To control the ATV31 via the Modbus communication channel, it is first necessary to configure
the Modbus communication parameters
inthe ATV31 COM- menu.
Parameter Add sets the modbus address
Parameter tbr sets the transmission speed as described below;
4.8 = 4800 bps
9.6 = 9600 bps
19.2 = 19200 bps
Parameter tFO sets the dataformat as described below;
8O1 = 8 data bits, odd parity, 1 stop bit
8E1 = 8 data bits, even parity, 1 stop bit
8n1 = 8 data bits, no parity, 1 stop bit
8n2 = 8 data bits, no parity, 2 stop bitPlease note that these settings are not stored until the ATV31 power supply is switched off and on
again.
Next, configure the command and reference channels. The Command channel is the channelwhich provides the ATV31 with signals to start and stop, the Reference channel provides the
motor speed reference.
These two items can be separated in terms of how they are programmed in the CtL-Command
menu, as shown in the following examples;
Example 1
Both the command and reference come from the Modbus communication channel.
CtL Command menu => Function access level: LAC = L3: Access toadvanced functions and
management of mixed control modes.
CtL Command menu => Reference 1 configuration: Fr1 = Mdb: Reference via Modbus.
CtL Command menu => Mixed mode: CHCF = SIM: Profile notseparate.
Example 2
The command channel is separate from the reference channel. The speed reference is sent via
modbus, control can be via the terminals, display terminal, etc.
CtL Command menu =>Function access level: LAC = L3: Access to advanced functions and
management of mixed control modes.
CtL Command menu => Reference 1 configuration: Fr1 = Mdb: Reference via Modbus.
CtL Command menu =>Mixed mode: CHCF = SEP: Profile separate.
CtL Command menu => Cd1: Configuration of command channel is selected from the following
choices;
tEr: Command via terminals
LOC: Command via keypad...