AccuEnergy AcuDC 241, User Manual

Page: 55 / 70

47
Addr Fun Byte count Data CRC16 hi CRC16 lo
11H 01H 01H 02H D4H 89H
Data Bytes
7 6 5 4 3 2 1 0
0 0 0 0 0 0 1 0
(Relay 1=OFF,Relay 2=ON)
Table 4-5 Response frame of reading Relay Output status
2. Read DI status (Function Code 02)
This function allows the user to obtain DI status ON/OFF(1 = ON , 0 = OFF). On top of slave
device address and function code, query frame must contain the digital input register,
starting address and the number of registers to be read. AcuDC 240 DI address starts from
0000H(DI1=0000H,DI2=0001H)
Table 4.6 depicts of reading DI1 to DI2 status of the slave device with the address of 17.
Addr Fun
DI start
addr hi
DI start
addr lo
DI num hi DI num lo CRC16 hi CRC16 lo
11H 02H 00H 00H 00H 02H FBH 5BH
Table 4-6 Query frame of reading DI status
Response
The slave device anwsers the master device's query. The response frame contains slave de-
vice address, function code, data quantity and CRC check. Each DI utilizes one bit(1 = ON ,
0 = OFF). Table 4.7 depicts the response frame.