User’s Manual Smart Digital Power Meter
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Chapter 8 Communication Interface
8.1 RS232 and RS485 Interface
has standard RS232 and RS485 communication interface
，
PC or PLC can remote control
via SCPI or Modbus command.
·The Definition of Pin
communication interface is DB9 female head, the definition of pin as shown in the following figure.
Communication Setting
Before operating communication, should
match with the following parameters of the control
host.
(1)
Baud Rate
：
4800, 9600, 19200, 38400, 57600, 115200.
The setting method of baud rate for can refer to section 6.2.
(2)
Check bit
：
NONE (fixed value)
(3)
Data bit
：
8 (fixed value)
(4)
Stop bit
：
1 (fixed value)
8.2 Connecting Example
8.2.1 PC connect to via RS232
· The number in block diagram represents the pin number of DB9 interface.
· Use direct serial port line to connect PC and . The factory provides direct serial port line.
· This connecting method supports SCPI and Modbus instruction.
As shown in the following figure.
1
NC
2
TXD
（
RS232
）
3
RXD
（
RS232
）
4
NC
5
GND
（
RS232
）
6
NC
7
NC
8
A(RS485)
9
B(RS485)
