11.5. Modbus RTU
Using the configuration tool, you can set these parameters:
• Baud rate: 1200, 2400, 4800, 9600, 19200, 38400, 56700 and 115200 bps
• Data Bits: 8 bits
• Parity: none, even, or odd
• Stop Bits: 1 and 2 bits
• Modbus server address
• Physical connection (EIA-232 or EIA-485)
IMPORTANT
• EIA-232 connector uses RX, TX, and GND lines.
• EIA-485 connector uses B-, A+, and SNGD.
11.6. Modbus TCP
Modbus TCP communication is characterized basically by the embedding of the Modbus RTU protocol into
TCP/IP frames, which allows faster communication and a longer distance between client and server devices in
comparison with RTU communication over a serial line. Another benefit is using common TCP/IP infrastructure in
buildings and transmitting over WAN or the internet. It also allows the coexistence of one or more clients and, of
course, one or more server devices in a given network, all interconnected through a TCP/IP-based network.
Use the configuration tool to configure the IP settings of the gateway (DHCP status, own IP, netmask, and default
gateway) and the TCP port.
NOTE
The default port is 502.
IN701-KNX Series
Modbus RTU
Page 16 of 44
USER MANUAL Version 1.0
