ABB IM300-I Operational Manual page 65

01H: read the output status of the relay.
02H: read the input status of remote.
03H: read register data.
04H: read the input data of register.
05H: single relay output.
06H: write a single register.
10H: write multiple registers.
55H: read the switch amount SOE information.
56H: read the alarm of SOE information.
Data code：
Data length is uncertain, data domain is the main station and slave station to read
and write register to carry on data exchange.
Error code：
The error codes supported by IM300 include the following:
Error code
01
Illegal function code
02 Illegal address
03 Illegal data
Check:
The data may be interfered with and changed during the transmission. The check
can detect whether the data has changed during the transmission, and ensure that the
host or the terminal does not respond to the erroneous data. The 16-bit cyclic
redundancy check (CRC16) is used for verification. The procedure for calculating
CRC-16 is described below.
The relevant byte in the frame is defined as a string of binary data (0,1). The 16th
checksum is obtained as follows: The stream of data streams is multiplied by 216 and
then divided by the generator polynomial (X16 + X15 + X2 + 1), which is expressed
in binary as 1100000000000101, the quotient is ignored and the remainder of 16 bits
is the CRC value . When calculating CRC-16 values, modulo two or XOR algorithms
are used for all arithmetic operations. The CRC-16 checksum is generated as follows:
① Omit the most significant bits of the generator, and reverse the order of the
IM300 Intelligent Power Monitoring Instrument
Name
63
Explain
Function code not supported by
sub-station.
The register address
supported by the sub-station.
Master station
supported by sub-station.
not
data not