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AcuRev 1300
2.1 Frame Format
Table 5-1 Data Frame Format
2.2 Address Field
The address field is at the start of the frame. It is composed of 1 byte (8 bits), its
decimalvalue range is 0-247.
A master addresses a slave by placing the slave address in the address eld of the
message. When the slave sends its response, it places its own address in this address
eldof the response to let the master know which slave is responding.
2.3 Function Field
When a message is sent from a master to a slave device the function code eld tells
theslave what kind of action to perform.
Table 5-2 Function Code
2.4 Data Field
Data field contains the data that terminals need to complete the request and the
Address Function Data Check
8-Bits 8-Bits N x 8-Bits 16-Bits
Code Meaning Action
03 Read data register Obtain current binary of 1 or more register
16 Preset register Set binary value to 1 or more register
01
Reading relay RO
status
Get the current state of the relay of the RO output (ON/OFF)
05
Control relay RO
state
Control relay RO output state (ON/OFF)
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