Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: 0086-573-83698881 83698882 Fax: 0086-573-83698883
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: sales@eastrongroup.com
Two pulse output indicates real-time energy measurement. An RS485 output allows remote monitoring from
another display or a computer.
Current Transformer Primary Current
The unit can be configured to operate with CT ratio between primary current and secondary current. The
secondary CT has two options: 1A/5A
RS485 Serial –Modbus RTU
This unit uses an RS485 serial port with Modbus RTU protocol to provide a means of remotely monitoring and
controlling the Unit
Set-up screens are provided for setting up the RS485 port.
Pulse output
The unit provides two pulse outputs. Both pulse outputs are passive type.
Pulse output 1 is configurable. The pulse output can be set with Modbus protocol:
0.01 kWh / imp
0.1 kWh / imp
1 kWh /imp
10 kWh / imp
100 kWh /imp
1000=1000 kWh/kVArh
Pulse width: 200/100(default)/60ms can set with Modbus protocol.
Pulse output 2 is non-configurable. It is fixed up with total kWh. The constant is 1000imp/kWh.
RS485 Output for Modbus RTU
For Modbus RTU, the following RS485 communication parameters can be configured from the Set-up menu:
Baud rate 1200,2400, 4800, 9600
Parity none (default)/odd/even
Stop bits 1 or 2
RS485 network address nnn – 3-digit number, 001 to 247
Modbus™ Word order Hi/Lo byte order is set automatically to normal or reverse. It cannot be configured
from the set-up menu.
Environment
Operating temperature -25℃to +55℃
Storage and transportation temperature -40℃to +70℃
Reference temperature 23℃±2℃
Relative humidity 0 to 95%, non-condensing
Altitude up to 2000m
Warm up time 10s
Installation category CAT III
Mechanical Environment M1
Electromagnetic environment E2
