Laser LS8000-3 manual Byte Value, Data Processing Procedure

Synchronization

LaserSpeed 8000-3 Instruction Handbook

RS-232/RS-422 Communication

Byte Value

0FF (hex)

1FF (hex)

2FF (hex)

3FF (hex)

4FF (hex)

5 QF (0-15) can't be FF

6Length Byte 3 (MSB)

7Length Byte 2

8Length Byte 1

9Length Byte 0 (LSB)

10 Status (0-63)

11 Velocity Byte 3 (MSB)

12 Velocity Byte 2

13 Velocity Byte 1

14 Velocity Byte 0 (LSB)

15 Checksum (8-bit sum of all bytes)

The Length and Velocity values are both 2's complement 32-bit integers that represent the current length and speed multiplied by 1000. The QF and Status are unsigned bytes. The Checksum value is the 8-bit sum of all the bytes including the 5 FF's used for synchronization.

Data Processing Procedure:

1)Wait for 5 sequential FF values

2)If the next value is not FF, store it as the QF, else go to #1

3)Read and store 10 more bytes

4)Check the last byte read (the checksum) to make sure it was correct

5)Process/Store Verified Reading

6)Repeat from step 1

Part No. 93463 / Drawing No. 0921-01561 Page 157 of 221 Revision A (Sep 2007)