CAI 700M - Page 182

700M HFID 6-2-15
182
Code 03
This command has been modified to read floating-point numbers in 32-bit IEEE format.
This function code is used to read the contents of a contiguous block of floating-point registers in
a remote device. The Request PDU specifies the starting register address and the number of
registers. In the PDU, registers are addressed starting at zero. Therefore, registers numbered 1-16
are addressed as 0-15.
The register data in the response message are packed as four bytes per register, with the binary
contents right justified within each byte. For each register, the first byte contains the high-order
bits and the second byte contains the low-order bits.
Request
Function Code
1 Byte
0x03
Starting Address
2 Bytes
0x0000 to 0xFFFF
Quantity of Registers
2 Bytes
2 to 124 (0x7C)
Response
Function Code
1 Byte
0x03
Byte Count
1 Byte
2 x N*
Register Value
N* x 2 Bytes
*N = Quantity of Registers