AccuEnergy Acuvim II, Руководство пользователя

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5.3.15 Format of function code 03H
This function code is used in MODBUS-RTU to read the contents of a continuous
block of holding registers in Acuvim II meter. In PROFIBUS-DP, the format of
function code 03H is defined as follows:
Query
Frame Bytes Caption
Byte1 Channels can be chosen from 1 to 8
Byte2 03H
Byte3 starting address high byte
Byte4 starting address low byte
Byte5 quantity of registers high byte
Byte6 quantity of registers low byte
Byte7~32 0
“Quantity of registers” indentifies how many words will be read.
Response
Frame Bytes Caption
Byte1 The channel of inquiry frame
Byte2 03H
Byte3 byte count
Byte4 Register value1 high byte
Byte5 Register value1 low byte
Byte6
......
Byte32
......
“Byte count” indentifies how many bytes will be read.
The register data in the response message is packed as two bytes per register,
with the binary contents correctly justified with each byte. For each register, the
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