Revision Date: April 18, 2019
Wiring
Diagrams
1P3W
3P3W
3P4W
1P3W with 2CTs
3P3W with 3CTs
3P3W with 2CTs
3P4W with 3CTs
RS-485 Wiring
The PMC-340 provides one standard RS-485 port and supports the Modbus RTU protocol. Up to 32 devices can be connected on a RS-485 bus.
The overall length of the RS-485 cable connecting all devices should not exceed 1200m.
If the master station does not have a RS-485 communications port, a RS-232/RS-485 or USB/RS-485 converter with optically isolated outputs and
surge protection should be used.
Each PMC-340 comes with a 120Ω Termination Resistor. It is recommended that a single termination resistor be used at the end of the RS-485
bus to prevent signal reflection.
Basic Setup Parameters
Menu
Parameters
Description
Range/Options
Default
PW
Password
Enter Password
0 to 9999
“0”
SYS SET
TYPE
Wiring Mode
The wiring connection of the meter
1)
DEMO/1P3W/3P3W/3P4W/
1P2W L-N/1P2W L-L
3P4W
CT1
CT1 Ratio
Primary CT Ratio
1 to 30,000 (A)
5A
CT2
CT2 Ratio
Secondary CT Ratio
1 to 5 (A)
5A
I1 Rev
Phase A CT
Reverse Phase A CT Polarity
YES/NO
NO
I2 Rev
Phase B CT
Reverse Phase B CT Polarity
YES/NO
NO
I3 Rev
Phase C CT
Reverse Phase C CT Polarity
YES/NO
NO
COM
SET
ID
Meter Address
Meter Address
1-247
100
BAUD
Baud rate
Data rate in bits per second
1200/2400/4800/
9600/19200/38400bps
9600
CFG
Comm. Port Configuration
Data Format
8N2/8O1/8E1/8N1/8O2/8E2
8E1
Notes:
1)
The wiring modes 1P2W L-N and 1P2W L-L are not supported by PMC-340A
.
