Yokogawa PR300 Power and Energy Meter - Manual (Page 116)

<Toc> <Ind> <8. PR201 Original Communication Protocol>
8-1
IM 77C01E01-10E
8. PR201 Original Communication Protocol
8.1 Overview
This function enables various measured values to be read into a personal computer
through the use of a command/response method. There are two ways for reading the
values. One is used to read values individually and another to read them in batch
mode (where only measurement items in the specified mode can be read).
8.2 Communication Specifications
Transmission distance
Connection method
Station number
Transmission method
Synchronization
Baud rate
Data format
Data bit
Parity
Stop bit
Xon/Xoff control
Communication error handling
PR300
Approximately 1.2 km maximum
(Use of 24 AWG twisted pair cable)
Multi-drop connection of up to 32 stations, including a high-level personal
computer
1 to 99
Half-duplex transmission
Start-stop synchronization
19200/9600/2400 bps
Start bit, one bit
8 bits
None
1 bit
Unavailable
If an invalid command is received, it is discarded and no response is returned.
Because noise or invalid commands are ignored, the higher-level PC must
perform time-out processing. The time-out time must be set to 1 second or
more. In addition, when a parameter or data causes an error, an error
response must be returned.
Command/response timing:
Command
Response
10 ms min.