EV/DV300 Series Power Meter
V:2.0 Revised October 2018
3. Read Data (function code 03)
Query
This function code is used to read the metering data in meter. Table 4.8 Example of reading
3 metering data U1, U2 and U3. The register address is, U1: 0110H, U2: 011H and U3:
0112H.
Table 4.8 Query of Reading U1, U2 and U3
Response
The response includes Address of slave device, function code, data register start address,
number of metering data and error check.
Table 4.9 Example of response of reading U1, U2 and U3 (U1=03E8H (100.0V),
U2=03E7H(99.9V), U3=03E9H(100.1V)).
Table 4.9 Response of reading U1, U2 and U3
4. Control Relay (function code 05)
Query
This message forces single Relay either ON or OFF. The start address of Relay is from 0000H.
(Relay1= 0000H, Relay2=0001H).
The data value FF00H will set the Relay ON and the value 0000H will turn it OFF. All other
values are illegal and will not affect that Relay.
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