1. FUNCTIONS AND CONFIGURATION
1 - 4
1.3 Communication specifications
The following table lists the Modbus/TCP communication specifications.
Function Description
Communication protocol
Modbus/TCP protocol
Conformed standard
OPEN Modbus/TCP SPECIFICATION
Port No.
No. 502
IP address
IPv4 range: 0.0.0.0 to 255.255.255.255
Use the same network address for both a client and servers.
Default value: 192.168.3.0
Subnet mask
Default value (recommended): 255.255.255.0
Message format
Refer to section 2.
Physical layer
1000BASE-T
Communication connector
RJ45, 1 port (CN1)
Communication cable
CAT5e, shielded twisted pair (4 pair) straight cable
Network topology
Star
Variable communication speed
100 Mbps
Transmission speed between stations
Max. 100 m
Waiting time setting
None
Maximum number of connections
3
Server function
Number of request messages that are
receivable simultaneously
1
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