INFICON LDS3000 Modular Leak Detector Interface description - Manual (Page 24)

24 Binary Interface Protocol
4 Binary Interface Protocol
4.1 Communication Parameters
4.2 Commands
On every command you have to acknowlede with a cmd number. In case of error
instead of a cmd number a error byte (
 230) is transfered.
Data format
Baudrate
19.200, 8 data bits, no parity, 1 stop bit
float 4 Bytes, IEEE754 (± 10
±38
), 3 Byte Mantissa,
1 Byte Exponent/Sign
unsigned long int [ulint]: 4 Bytes, integer without algebraic sign MSB …
LSB (0 … 4294967295)
unsigned short int [usint]: 2 Bytes, integer without algebraic sign MSB,
LSB (0 … 65535)
signed short int 2 Bytes, integer without algebraic sign MSB, LSB
(-32768 … 32767)
unsigned char [uchar]: 1 Byte, integer without algebraic sign (0 … 255)
unsigned char [uchar]: 1 Byte, character ASCII Code (0 … 255)
Nr Name Description Parameter Data
2 GetPv Fore vacuum pressure
Byte 0: unit (0-mbar,
1-Pa, 2-atm, 3-Torr)
Pv [float]
5 GetDeviceID Device type LDS2000Plus: 31dec.
8
9
GetGasballast
SetGasballast
Gas ballast valve
Byte 0: 0-off, 1-on,
2- main fail safe -on
36
37
GetCalFac
SetCalFac
Calibration factor
Byte 0: 0-Vacuum;
1-Sniff
Factor [float]
40
41
GetMass
SetMass
Measure mass [uchar, 2/3/4 for mass 2/3/4]
50
51
GetZero
SetZero
Zero (suppress background)
0-off
1-on
54 GetCal Read calibration state 0-int.Cal; 1-ext.Cal
0-inactiv; 1-active; 2-wait for
calibrated leak close (only
at external calibrations)
55 SetCal Start / Stop calibration 0-int.Cal; 1-ext.Cal
0-stop; 1-start; 2-finish (
TL close; only at external
calibrations)