Yokogawa PR300 Power and Energy Meter - Manual (Page 95)

<Toc> <Ind> < 6. Modbus/TCP Communication Protocol>
6-1
IM 77C01E01-10E
6. Modbus/TCP Communication Protocol
6.1 Overview
Modbus/TCP is one of the protocol used to communicate with devices such as PCs
or PLCs (sequencers) using the TCP/IP protocol via Ethernet and other networks.
This communication protocol is used to perform read/write operations with the D
registers in the PR300 and exchange data with connected devices.
The PR300 can be connected to IEEE802.3-compliant networks (10BASE-T/
100BASE-TX). Generally, the Modbus/TCP protocol communicates through port 502.
In addition, the PR300 operates as Ethernet-serial gateway. A higher-level device can
exchange data with other serial communication devices using the Modbus/TCP
protocol via the PR300.
Application Layer
Transport Layer
Network Layer
Data link Layer
Physical Layer
Modbus/TCP
TCP
IP
ETHERNET
10BASE-T/100BASE-TX
Higher-level devices (PC etc.)
Figure 6.1 Network Layer