Emotron AB 01-4429-01r2 Serial communication 49
10. Serial communication
The VSD provides possibility for different types of serial
communication.
• Modbus RTU via RS232/485
• Fieldbuses as Profibus DP and DeviceNet
• Industrial Ethernet type Modbus/TCP
10.1 Modbus RTU
The VSD has an asynchronous serial communication inter-
face behind the control panel. The protocol used for data
exchange is based in the Modbus RTU protocol, originally
developed by Modicon. the physical connection is RS232.
The VSD acts as a slave with address 1 in a master-slave con-
figuration. The communication is half-duplex. It has a
standard no return zero (NRZ) format.
The baud rate is fixed to 9600.
The character frame format (always 11 bits) has:
• one start bit
• eight data bits
•two stop bits
•no parity
It is possible to temporarily connect a personal computer
with for example the software EmoSoftCom (programming
and monitoring software) to the RS232 connector on the
control panel. This can be useful when copying parameters
between variable speed drives etc. For permanent connection
of a personal computer you have to use one of the commu-
nication option boards.
Fig. 56 Mounting frame for the control panel
10.2 Parameter sets
Communication information for the different parameter
sets.
The different parameter sets in the VSD have the following
DeviceNet instance numbers and Profibus slot/index num-
bers:
Parameter set A contains parameters 43001 to 43556. The
parameter sets B, C and D contains the same type of infor-
mation. For example parameter 43123 in parameter set A
contain the same type of information as 44123 in parameter
set B.
A DeviceNet instance number can easily be converted into a
Profibus slot/index number according to description in sec-
tion section 11.8.2, page 144.
NOTE: This RS232 port is not isolated.
Correct and safe use of a RS232 connection
depends on the ground pins of both ports
being the same potential. Problems can
occur when connecting two ports of e.g.
machinery and computers where both ground pins are
not the same potential. This may cause hazardous
ground loops that can destroy the RS232 ports.
The control panel RS232 connection is not galvanic
isolated.
The optional RS232/485 card from Emotron is galvanic
isolated.
Note that the control panel RS232 connection can
safely be used in combination with commercial available
isolated USB to RS232 converters.
Parameter
set
Modbus/DeviceNet
Instance number
Profibus
Slot/Index
A 43001–43556 168/160 to 170/205
B 44001–44529 172/140 to 174/185
C 45001–45529 176/120 to 178/165
D 46001–46529 180/100 to 182/145
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