Yaskawa FSP Amplifier FlexWorks - Manual (Page 208)

Serial Interface Protocol
208
Description: Message checksum (two bytes for two digits). The
checksum is calculated by summing all bytes (excluding N and CR)
in a message body (Section 6.2.2.1, Checksum Calculation).
S1
AND
S2
Range: 0x0 – 0xFF. 0x0 – 0xF each
Description: Carriage Return. Used as a message response
termination symbol. Constant value.
CR
Range: CR (0x0D in ASCII code)