User Documentation

Specifications
112 1435710000/01/05.13
10.3 Communication specifications
<RS485>
Interface Conforming to RS485
Communication method Half-duplex
Synchronous system Synchronous communication method
Isolation status Isolated with the internal circuits (basic insulation)
Protocol
MEWTOCOL, MODBUS(RTU), DL/T645-2007 *
1
(select with setting mode)
Number of connected unit 99 (max.) *
2
Transmission distance 1200 m *
3
Transmission speed
38400, 19200, 9600, 4800, 2400, 1200bps
(select with setting mode)
Transmission
format
Data length 8 bit (fixed)
Parity
Not available / odd number / even number
(select with setting mode)
Stop bit
1 bit, 2 bit
(select with setting mode)
*1 MEWTOCOL is the protocol for PLC from Panasonic.
DL/T645 is the Chinese power-meter standard. Only DL/T645-2007 is supported.
*2 For a RS485 converter on the computer side, we recommend SI-35 and SI-35USB (from LINE EYE Co.,Ltd.). When
using SI-35,SI-35USB or a PLC from our company (which can be connected up to 99 units), up to 99 can be con-
nected. If using this system with other devices, up to 31 can be connected.
*3 Please check the current devices when some commercial devices with an RS485 interface are connected. The
number of connected devices, transmission distance, and transmission speed may be different depending on the
transmission line used.
< USB >
Electric specification Conform to USB2.0 standard
Connector shape USB series MiniB
Insulation method Insulated to internal circuit
Transmission speed 12 Mbps (full speed)
Transmission function Computer link (MEWTOCOL)
Note
1) Install the dedicated USB driver before using the USB port.