7.1.2 Network Connection
Connect the frequency converter to the RS485 network
as follows (see also
1.
Connect signal wires to terminal 68 (P+) and
terminal 69 (N-) on the main control board of the
frequency converter.
2.
Connect the cable shield to the cable clamps.
NOTICE
To reduce noise between conductors, use shielded,
twisted-pair cables
61 68 69
N
P
COMM. GND
130BB795.10
Illustration 7.2 Network Connection
7.1.3 Frequency Converter Hardware Set-up
Use the terminator dip switch on the main control board
of the frequency converter to terminate the RS485 bus.
The factory setting for the dip switch is OFF.
7.1.4 Parameter Settings for Modbus
Communication
Parameter
Function
Parameter 8-30 Prot
ocol
Select the application protocol to run for
the RS485 interface.
Parameter 8-31 Add
ress
Set the node address.
NOTICE
The address range depends on the
protocol selected in
parameter 8-30 Protocol
.
Parameter 8-32 Bau
d Rate
Set the baud rate.
NOTICE
The default baud rate depends on the
protocol selected in
parameter 8-30 Protocol
.
Parameter 8-33 Pari
ty / Stop Bits
Set the parity and number of stop bits.
NOTICE
The default selection depends on the
protocol selected in
parameter 8-30 Protocol
.
Parameter 8-35 Min
imum Response
Delay
Specify a minimum delay time between
receiving a request and transmitting a
response. This function is for overcoming
modem turnaround delays.
Parameter 8-36 Ma
ximum Response
Delay
Specify a maximum delay time between
transmitting a request and receiving a
response.
Parameter 8-37 Ma
ximum Inter-char
delay
If transmission is interrupted, specify a
maximum delay time between 2 received
bytes to ensure timeout.
NOTICE
The default selection depends on the
protocol selected in
parameter 8-30 Protocol
.
Table 7.2 Modbus Communication Parameter Settings
RS485 Installation and Set-...
VLT
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Compressor Drive CDS 803
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MG18N202
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