AccuEnergy DV300 Series, Руководство пользователя

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EV/DV300 Series Power Meter
V:2.0 Revised October 2018
42
2 Read status of Digital Input (function code 02)
Query
This function is used to read the status of DI ON/OFF (1=ON, 0=OFF). The frame message
contains slave device address, function field, quantity of data characters, data characters and
error checking. The address of DI status start from 0000H (DI1=0000H, DI2=0001H,
DI3=0002H, DI4=0003H, DI5=0004H, DI6=0005H).
Table 4.6 Example of reading DI1 to DI4 status of slave device 17.
Addr Fun
DI start
addr hi
DI start
addr lo
Data
num hi
DI num
lo
CRC16
hi
CRC16
lo
11H 02H 00H 00H 00H 04H 7BH 59H
Response
The response of DI status query includes address, function code, data count, data and error
check. All DI status relate to one byte. The DI1 to DI4 starts from the last bit of the byte (1=ON,
0=OFF). As in Table 4.7, DI1=ON, DI2=ON, DI3=OFF and DI4=OFF.
Table 4.7 Example of response to query of DI1 to DI4 status.
Addr Fun Byte Count Data
CRC16
hi
CRC16
lo
11H 02H 01H 03H E5H 49H
Data byte
Table 4.7 Response to query of DI1 to DI4
0 0 0 0 DI4 DI3 DI2 DI1
0 0 0 0 0 0 1 1
MSB LSB
(Relay1 = OFF, Relay2=ON)