KW1M-H Eco-POWER METER
73
8.3 Output Specifications
8.3.1 Pulse output (Transistor output)
Number of output point
1 point
Insulation method
Optical coupler
Output type
Open collector
Output capacity
100mA 30V DC
Pulse width
approx. 100ms
ON state voltage drop
1.5V or less
OFF state leakage current
100
μ
A or less
Pulse output unit
0.001/0.01/0.1/1/10/100kWh/Alarm(AL-P)/
Current alarm(AL-C) /Stand-by alarm (AL-S) /Counter(Cnt) /
Demand alarm(DEM) / Pulse-through(P-THR)
(Selectable with setting mode)
* We recommend the setting of minimum unit for pulse output for measurement shown as below.
Output pulse: 4-pulse or less per 1sec.
How to calculate
(Unit for pulse output: PL-P)
＞
(Max. measurement power [kW]
）／
(3600[s]
×
4 [pulse/s])
Note
(1) Improper unit setting may cause miss counting.
(2) If the OFF time is too short, there is a possibility of counting errors.
8.4 Communication Specifications
Interface
Conforming to RS485
Protocol
MEWTOCOL/MODBUS(RTU) (selectable with setting mode)
Isolation status
Isolated with the internal circuit
Number of connected units
99 (max.)
*2 *3
Transmission distance
1200m (max.)
*1
Transmission speed
115200/57600/38400/19200/9600/4800/2400bps
(selectable with setting mode)
Transmission
Format
Data length
8bit/7bit (selectable with setting mode)
*4
Parity
Not available / Odd number / Even number (selectable with setting mode)
Stop bit
1bit (fixed)
Communication method
Half-duplex
Synchronous system
Asynchronous communication method
Ending resistance
app
rox. 120Ω(built-in)
*1 Please check with the actual devices when some commercial devices with RS485 interface are connected. The
number of connected devices, transmission distance, and transmission speed may be different according to using
transmission line.
*2 For RS485 converter on the computer side, we recommend SI-35 and SI-35USB (from LINE EYE Co.,Ltd.).
*3 When using SI-35,SI-35USB or PLC from our company (which can be connected up to 99 units), up to 99
Eco-POWER METER can be connected. In case using this system with the other devices, up to 31 Eco-POWER
METER can be connected.
*4 With MODBUS(RTU) protocol, it works only with 8bit.
*5 Transmission distance is limited as below according to transmission speed and number of connected unit.
With under 38400bps, max.distance is 1200m and max. number is 99 units.
Distance
Speed 57.6kbps
Speed 15.2kbps
1200
1000
700
（
m
）
0
99
70
40
unit
