Delta DPM-C520, Operation Manual

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D P M - C
5 2 0 / C 5 2 0W O p e r a t i o n M a n u a l
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

Use shielded twisted-pair cables for RS485 communication. When connecting multiple devices in series,
use the wiring method in the following diagram.
Termina l Resistor

Connect the D+ communication terminal for all devices on the same twisted pair cable. Connect the D-
terminals on the other twisted pair cable. Ground the cable shield. Install a terminal resistor on the
terminal device as shown.

Use cables with a diameter of 14–24 AWG.