ELWA
®
Modbus Interface Operation Manual, 171018
If the sensor (see figure) indicates a value >80 °C the pins may not be connected correctly or
there might be a sensor break. A negative value can be an indication of a short circuit.
Terminating resistor in the bus system
Bus systems are high-resistive. For this reason, a terminating resistor (120 Ohm) must be set,
ideally at the most remote location of the bus master. The resistance is included in the package.
6. Modbus register description
Modbus RTU Standard, Comm parameters 9600/8/N/1, All registers unsigned int (16 bit)
Register Address mode Content
1000 R Operating Day Counter
1001 R/W Operation mode (see Table 1), write 1 skips 10 minutes startup delay
1002 R DC Breaker status, 0: open, 1: closed
1003 R DC Relay status, 0:open, 1: closed
1004 R/W AC Relay status, 0: open, 1: closed, write to register starts/stops ELWA AC relay
1005 R Temperature in 1/10°C
1006 R Current Water Temp Day minimum in 1/10°C
1007 R Current Water Temp Day maximum in 1/10°C
1008 R DC Temp Setting in 1/10°C
1009 R/W AC Temp Setting In 1 / 10°C
1010 R Internal Temperature of Electronics in °C
1011 R DC Isolation value
1012 R DC Voltage 0.1V
1013 R DC Current mA
1014 R DC Power in W
1015 R Current Day DC Energy in Wh
1016 R Total DC Energy kwh
1017 R Current Day AC Energy in Wh
1018 R Internal clock (minutes from noon)
1019 R Minutes since current day wakeup
1020 R/W AC boost mode, AC switch on time in minutes from noon
0 ELWA internal temperature controlled
1-1440 ELWA internal time controlled in minutes from noon
>1440 ELWA internal control off, controlled via ELWA Modbus Interface
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