38
3 Interface
3
2.5 Checksum
Checksum is two’s complement of the value that adds every ASCII code in the calculation range.
Calculation example: T format
Character number
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19
Transmitted data
#
0
0
0
0
2
-
0
0
0
.
4
:
3
2 CR
ASCII
Code
HEX
23 30 30 20 30 30 20 32 20 2D 30 30 30 2E 34 3A
D
DEC
35 48 48 32 48 48 32 50 32 45 48 48 48 46 52 58
13
DEC
notation
HEX
notation
Lower two digits
Remarks
HEX notation
BIN notation
Calculation
of
data strings
Sum
718
2CE
CE
11001110
Sum of every ASCII code
Complement
-719
D31
31
110001
Complement of the sum
Two’s complement
-718
D32
32
110010
Adds 1 to the complement value
Checksum
32
2.6 Printer
Use a printer that can print 80 characters or more in one line, and that can print character fonts. Also, use a
cable whose length is 3 m or shorter.
Recommended Printer: DPU-414 series (Seiko)
Printer Cable Wiring
Change settings for the printer to the follows:
CR: Carriage Return
Baud Rate: 9600 (bps)
Data Dumping
Data is printed out after every leak test.
Print Out Fields
Field
Example
DATE
12-12-01
Date the test was completed (YY-MM-DD)
TIME
11:14:21
Time the test was completed
CH#
00
Channel number I which the test was done
TOTAL#
116
Quantity of parts that have been tested
PRESSURE
97.8 kPa
Test pressure measured
dP [Pa]
5.59
The detected differential pressure drop
COMP[Pa]
5.77
Amount of compensation
LEAKAGE
0 mL/min
Calculated leak rate (after compensation)
RESULT
OK
Judgment of whether part is within the programmed leak limits (Pass).
If there is an error detected during the leak test, an error symbol will be printed.
DPU414
9 pin
SD(TxD)
RD(RxD)
RS(RTS)
CS(CTS)
SG
LS-R700
9 pin
2
3
5
FG
SD(TxD)
RD(RxD)
SG
2
3
7
8
5
