43
Table 6.1
RTU
Data Format
6.1.2 The RTU Frame Format
Query and response information is sent in frames. Each frame
contains:
Address
Function (See Section 6.1.4 for descriptions of functions),
Data
Check
Address
Function
Data
Check
8 bits
8 bits
N * 8 bits 16 bits
Table 6.2
R T U Message Frame Format
If the receiving device (Powermeter) detects a time laps of five
characters, then it will assume the message is incomplete and will
flush the frame. The device then assumes that the next byte received
will be an address. The maximum query and response message
length is 256 bytes includuing check characters.
Field
No. of bits
Start bit
1
Data bits
8
Parity
1
Stop it
1