INFICON Helium Leak Detector Modul1000 Interface description - Manual (Page 17)

Binary Protocol
1-15
jin
s
80
e.f
m
Op
er
at
in
g M
a
nua
l
(1
01
1)
Example 1: Get trigger level 2 in mbarl/s
PC Î leak detector
leak detector Î PC:
4.3 Data Format
5 6 56 2 0 69
0x05 0x06 0x38 0x02 0x00 0x45
Start Length Command Para0 Para1 Checksum
Trigger Trig. 2 mbarl/s
7 57 52 0 217 89 166
0x07 0x39 0x34 0x00 0xD9 0x59 0xA6
Length Command Data Data Data Data Checksum
1.2E-7 (4-Byte float)
float 4 bytes, after IEEE754 (± 10
±38
), 3 bytes mantissa, 1 byte
exponent / sign
unsigned long int [ulint]: 4 bytes, integral number without sign MSB … LSB
(0 … 4294967295)
unsigned short int [usint]: 2 bytes, integral number without sign MSB, LSB
(0 … 65535)
signed short int 2 bytes, integral number with sign MSB, LSB
(-32768…32767)
unsigned char [uchar]: 1 byte, integral number without sign (0…255)