Omega PHCN-961, Руководство пользователя, Страница: 37 / 46

37
The instrument response : 40,30,31,52,52,D1_D2,………,D55_D56,CRCH,CRCL,0D(64
bytes)
40 : the start byte
30 31:ID
52 52 : the fix data
D1_D56_the parameter of sending (8 double byte,12 byte, total 28 bytes)
CRCH_CRCL: CRC
0D: the end byte
4 . Notice for programming the communication program
If the instrument receives the data with the start byte is 40 and the count of sequence data
over 16 bytes and did not find the 0D then the data is invalid. The instrument will not respond.
If the sequence data is not between 00H to 0FH, the sequence data is invalid. The instrument
will not respond. But the other errors, ex: the wrong instruction, the wrong address, the wrong
parameter counts, the wrong CRC and so on, the instrument will respond the wrong information.
All parameters, please see the following table, some parameters are include decimal.
para TST1 TST2 SP1U SP2U CUR
L CUR
H POFS HOR AAA FUN
C
decima 1 1 0/2 0/2 0/2 0/2 0/2 0 0 0
para R3OP TOFS SEC SP1D SP1T SP2D SP2T NB BT CON
decima 0 1 0 0/2 0 0/2 0 0 0 0
The PC display the reading values should be include the decimal.
TOFS is the correct value of temperature, the setting range is 0 ~ 200, the display range is
–100
~
100, so the PC should be subtract 100 and display with sign.
1) FUNC is the display mode of instrument : 0=mV; 1=ORP; 2=pH
2) R30P is the mode of relay 3: 0
= NOR : 1 = SP1 ; 2 = SP2 ; 3 = ALL ; 4 = CAL ; 5 ~ CLE
°
3) AAA is the reserve parameters
4) CONF is a byte parameter, the define is following,
Bit 7 : temperature compensation : 1=automation 2=manual
Bit 6: current output, 1 = 4_20mA ; 0 = 0 ~ 20mA ;
Bit 5: SP1
,
1
=
HI
;
0
=
LO
;
Bit 4: SP2 , 1 = HI ; 0=LO ;
Bit 3 : control mode , 1
=
PLC
;
0
=
Lit
;
Bit 2 : electrode selection , 1 = ANTI ; 0 = GLAS ;
Bit 1: buffer, 1
=
NST
;
0
=
USA;
Bit 0 :reserve