Delta DPM-C510, Руководство по эксплуатации

Страница: 21 / 46

Multi-functional Power Meter DPM-C510 Operation Manual
3-6
_3 _3
The following table lists the symbols used in the diagram.
Symbol
Description Grounding
Current
transformer
Terminal
block
Voltage
transformer
Fuse
3.3.2 Communication Characteristics

Communications Specifications
Max. Communication
Distance
1200 m Baud Rate 9600, 19200, 38400 bps
Max. Connection
Number
32 Data Length 8-bits
Communication
Protocols
Modbus RTU Parity None, Odd, Even
Function Code 03, 06, 10 Stop Bits 1
Note:
The 7-bit data length is not available for the Modbus RTU protocol.

Use shielded twisted-pair cables for RS485 communication. When connecting multiple devices in series,
use the wiring method in the following diagram.
Terminal Resistor

Connect the D+ communication terminal for all devices on the same twisted pair cable. Connect the D-
terminals on another twisted pair cable. Ground the cable shield. Install a terminal resistor on the terminal
device as shown.

Use cables with a diameter of 12–24 AWG.