INFICON HLD6000 Refrigerant Leak Detector Interface Description - Manual (Page 38)

38 Trouble Shooting
5.3 LD Protocol specific
Error Possible Reason Solution
IO1000 does not reply Wrong Address Always use Address 1 in LD protocol.
Other protocol errors Try to use NOP command (05hex 04hex 01hex
00hex 00hex 77hex) first, to check if connection
works in general. The answer should be 02hex
05hex XXhex XXhex 00hex 00hex XXhex
IO1000 replys with CRC
error (error code 1) Wrong CRC calculation Check you CRC code calculation. See example C
source file "CRC_calculation.c" provided by
INFICON. Check your code with unit test function in
this source code file.