AccuEnergy AcuRev 2000, Руководство пользователя

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1. Read Relay Output status(Function Code 01)
Query
The master device sends query frame to the salve deivce. Function Code 01 allows users
to acquire the relay output status (1=ON, 0=OFF) of the slave device with the specified
address. On top of slave device address and function code, query frame must contain the
relay register starting address and the number of registers to be read.
Table 5-4 depicts reading Relay 1 and Relay 2 status of the slave device with the address of
17.
Addr Fun Relay start
reg hi
Relay start
reg lo
Relay #of
regs hi
Relay #of
regs lo
CRC16
Hi
CRC16
Lo
11H 01H 00H 00H 00H 02H BFH 5BH
Table 5-4 Query frame of reading Relay Output status
Response
The slave device anwsers the master device's query. The response frame contains slave
device address, function code, data quantity and CRC check. Each relay utilizes one bit(1 =
ON , 0 = OFF). Table 5-5 depicts the response frame.
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
MSB LSB
(Relay 1 = OFF , Relay 2=ON)
Table 5-5 Response frame of reading Relay Output status