CG Drives & Automation 01-5980-01r2 Serial communication 139
9. Serial communication
The softstarter provides the possibility of different types of
serial communication.
• Modbus RTU via RS232, RS485, USB and BT
• Fieldbuses such as Profibus DP and DeviceNet
• Industrial Ethernet such as Modbus/TCP, Profinet IO
and EtherCAT
See “12. Options” on page 155 for available communication
option boards.
9.1 Modbus RTU
There is an asynchronous unisolated RS232 serial
communication interface on top of the Emotron TSA unit.
It is also possible to use the isolated RS485 or USB option
boards (if installed).
The protocol used for data exchange is Modbus RTU
protocol, originally developed by Modicon. The softstarter
acts as a slave with address 1 in a master-slave configuration.
The communication is half-duplex. It has a standard non
return zero (NRZ) format.
The baud rate is fixed to 9600 with fixed address = 1
(on-board RS232 port), but it is adjustable for the USB and
RS485 option boards.
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 top of
the Emotron TSA unit. This can be useful when copying
parameters between softstarters, etc. For permanent
connection of a personal computer you have to use one of
the isolated communication option boards RS485 or USB,
see also Note below.
9.2 Parameter sets
Communication information for the different parameter
sets.
The different parameter sets in the softstarter have the
following DeviceNet instance numbers, Profibus slot/index
numbers, Profinet IO index and EtherCAT index numbers:
Parameter set A contains parameters 43001 to 43899. The
parameter sets B, C and D contain the same type of
information. For example parameter 43123 in parameter set
A contains the same type of information as 44123 in
parameter set B.
NOTE: The built in RS232 port on top of the Emotron TSA
unit is not galvanically isolated.
It is therefore important that all externally connected
equipment to the control board are on the same
potential level. Otherwise equipment may be damaged!
If uncertain, we advice you to use the isolated USB
option instead or to use an isolated USB to RS232-
converter.
WARNING!
Correct and safe use of a RS232 connection
depends on the ground pins of both ports
having the same potential. Problems can
occur when connecting two ports of e.g. machinery and
computers where both ground pins have not the same
potential. This may cause hazardous ground loops that
can destroy the RS232 ports.
The on-board RS232 connection is not galvanically
isolated.
The RS485 and USB option boards from CG Drives &
Automation are galvanically isolated.
Note that the on-board RS232 connection can safely be
used in combination with commercially available
isolated USB to RS232 converters.
Param.
set
Modbus/
DeviceNet
Instance
number
Profibus
Slot/Index
Profinet IO
index
EtherCAT
index
(hex)
A
43001–
43899
168/160 to
172/38
19385 -
20283
4bb9 - 4f3b
B
44001–
44899
172/140 to
176/18
20385 -
21283
4fa1 - 5323
C
45001–
45899
176/120 to
179/253
21385 -
22283
5389 - 5706
D
46001–
46899
180/100 to
183/233
22385 -
23283
5771 - 5af3
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