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User Manual Modbus TCP Slave / Modbus Master
Document code: MN67507_ENG Revision 2.400 Page 29 of 45
Figure 3e: “Set Communication  Modbus TCP
Slave” window
M
ODBUS
TCP S
LAVE
:
This section is used to define the general parameters of Modbus TCP. The means of
the fields are:
In the field “
IP Address
” the IP address of the converter is defined;
In the field “ SubNet Mask ” the Subnet Mask of the converter is defined;
In the field “ Gateway ” the default gateway of the net is defined. This feature
can be enabled or disabled pressing the Check Box field. This feature is used
for going out of the net;
In the field “ Port ” the port used for Modbus TCP communication is defined;
Checking “ Enable UDP Port ” field it is possible to do a Broadcast request.
This request must be made at Port 64223 ($FADF) with these six byte of
data: $53, $45, $41, $52, $43, $48. Each device in response sends a total of
10 Bytes. These bytes are four for the IP and the other for the MAC address
(Example of response: 0xC0, 0xA8, 0x01, 0x2A, 0x11, 0x22, 0x33, 0x44,
0x55, 0x58. So the IP is: 192.168.1.42; and the MAC Address: 11-22-33-44-
55-58 );
If the field “ Enable Special Command ” is checked, it is possible to send a no-Modbus request through the Converter. i.e. a TCP
frame with the first two characters 0x55 and 0xAA is sent in the Modbus RTU line as is. If you don’t want to send the first two bytes
(0x55, 0xAA) in the RTU line it is possible to check the field “
Cancel the first two bytes ”;
If the field “ No TCP frame on RTU Timeout ” is checked, the Converter don’t sends back the reply on TCP (error response) if the
Slave RTU interrogated has not replied.
If the field “ Fast StartUp (only 100Mb/s) ” is checked, the Converter take less time to go online. This command can use only if the
Converter is used in a 100Mb/s network;