INFICON HLD6000 Refrigerant Leak Detector Interface Description - Manual (Page 18)

18 LD Protocol
Command info
Data types
All data types are used in Big Endian format (Motorola format), i.e. the byte with the
highest-order bits is transferred first.
Arrays
• Read single elements: Array index in first DATA-byte
• Write single elements: Array index in first DATA byte and values in following
DATA bytes
• Read all elements: Pseudo array index 255 in first DATA byte
• Write all elements: Pseudo array index 255 in first DATA byte and values in
following DATA bytes
• Response from slave (in case data are sent): Array index or pseudo array index
in first DATA byte and values in following DATA bytes
All elements of an array have the same Min/Def/Max value.
Array parameters in commands table (see chapter 3.4 ): The number of array
elements is set in brackets behind the data type.
1. Byte Data type (see table “Data types”)
2. Byte Number of array elements:
0 = no data, no array
1 = data, no array
2 ... 255 = array
3. Byte Bit 0: 1 = Reading allowed, 0 = Reading not allowed
Bit 1: 1 = Writing allowed, 0 = Writing not allowed
Bit 2 ... 7: always 0 (not used)
Value Meaning Acronym Comments
1 Signed 8 bit integer SINT8
2 Signed 16 bit integer SINT16
3 Signed 32 bit integer SINT32
4 Unsigned 8 bit integer UINT8
5 Unsigned 16 bit integer UINT16
6 Unsigned 32 bit integer UINT32
7 Character CHAR ISO 8859-1; printable characters
16 Signed 64 bit integer SINT64
17 Unsigned 64 bit integer UINT64
18 Floating point/real number FLOAT 4 Byte single float according to
IEEE 754
20 no data NO_DATA For commands without data, such
as Start