Yokogawa PR300 Power and Energy Meter - Manual (Page 80)

<5. Modbus/RTU and ASCII Communication Protocols>
5-1
IM 77C01E01-10E
5. Modbus/RTU and ASCII Communication
Protocols
5.1 Overview
The use of Modbus communication enables the PR300 to communicate with a
device such as a PC or PLC (sequencer). Such a device can be used in communica-
tion to read/write data from/to D registers which are internal registers of the PR300.
Hereafter, PCs are generically called “higher-level devices.”
Higher-level device
RS-485 communication
Maximum communication distance: 1200 m
Maximum number of slave stations to be connected: 31
Figure 5.1 Example of Connection for Modbus Communication
See Also
Chapter 7 for information on the D registers.