INFICON LDS3000 Modular Leak Detector Interface description - Manual (Page 48)

48 LD Protocol
5.5 Error messages
Telegram error handling
• Slave discards all characters until it receives a STX as telegram start identifier.
• Slave does not generate an error message, if address is not correct.
• Slave reports CRC errors with error message 1 (CRC failure)
• Slave reports length errors with error message 2 (Illegal telegram length) or 11
(Data length is not correct for the command)
To prevent the response from colliding with the next request, the slaves do not
respond in case of a timeout.
Error numbers (for Stw: Bit 15 to 1)
In case of error: STX, LEN, Stw, Cmd and one Data-Byte (with error number) sent
1 CRC-failure
2 Illegal telegram lenght
10 command doesn't exist
11 Data length is not correct for the command
12 Read not allowed
13 Write not allowed
14 Array-Index out of range or missing
20 Control actually not allowed with this interface
21 Password not OK
22 Command actually not allowed (e.g. calibration during Run-Up)
30 Data not in range
31 No data available