Delta DPM-MA1121, User Manual

Page: 19 / 45

D e lt a M u lt i- C ir c u i t P o w e r M e t e r D P M - M A11 2 1 U s e r M a n u a l
3 - 4
_3
3.3.2 Communication Property

Communication Specifications :
Max distance of communication 1200 m Baud Rate
1200
、
2400
、
4800
、
9600
、
19200
、
38400
Max number of connected stations
32
Data Bit
8
Communication Protocols
MODBUS RTU
Parity N81
、
N82
、
O81
、
E81
Functional Code 03, 06, 10 Stop Bit
1
、
2

Communication property of RS-485 must be use twist-pair.

The communication property D+ terminal of all devices needs to be connected to the same twisted-pair ,
the D- terminal needs to be connected to another twist-pair, the isolation net ground treatment, and the
terminal equipment needs to be loaded with terminal resistance.

Please use 22~18 AWG at wiring terminal.