INFICON SKY CDGxxxD (RS232C) - Manual (Page 5)

tira49e1-a (2010-02) RS232C.cp
5
All variables in a receipt string that are addressed for reading are output on this
byte. For variable types >1 byte, each byte (e.g. low, high, or further bytes) has to
be addressed and read individually.
Read Command L-Byte → Read Data L-Byte
Read Command H-Byte → Read Data H-Byte
• After a write operation, the value of the addressed variable is output.
• After a reset (Power on) the software version is output on byte 6.
Bit No.
0 … 3
Description Comment
0x0 F.S.R.= 10 -3
→ Variable "Sensor_pressure_range"
0x1 F.S.R.= 10 -2 F.S.R._Exponent = (<value> -3)
0x2 F.S.R.= 10 -1
0x3 F.S.R.= 10 0 = 1
0x4 F.S.R.= 10 1 = 10
0x5 F.S.R.= 10 2 = 100
0x6 F.S.R.= 10 3 = 1000
0x7 F.S.R.= 10 4 = 10000
Bit No.
4 … 7
Description Comment
0x0 F.S.R._Mantissa = 1.0 → Variable "Sensor_FSR"
0x1 F.S.R._Mantissa = 1.1
0x2 F.S.R._Mantissa = 2.0
0x3 F.S.R._Mantissa = 2.5
0x4 F.S.R._Mantissa= 5.0
The recipient (master) is synchronized by checking three bytes:
Byte No. Function Value Comment
0 Data string length 7 Constant value
1 Page No. 4
3
2 Constant value for CDG025D 1)
Constant value for CDGxxxD 2)
Constant value for CDG025D 3)
8 Checksum of bytes
No. 1 … 7 0 … 255 Low byte of checksum 4)
1) CDG025D with output signal 10.00 V (analog)
2) CDG045D, CDG100D, CDG160D, CDG200D with output signal 10.24 V (analog)
3) CDG025D with output signal 10.24 V (analog)
4) Possible high bytes are ignored
Read command
(byte No. 6)
Sensor type
(byte No. 7)
Checksum and synchronization
(byte No. 8)