Section 10. Processing Instructions
10-21
PAR.
DATA
NO.
TYPE
DESCRIPTION
01:-08:
2
Depends on the preceding instruction.
Following Instruction 97:
RF IDs and Phone No., one digit at a time
‘32’ between RF IDs
‘70’ after the last RF ID,
‘32’ and ‘84’ between RF and DC112 / Hayes Modem
Phone No.
‘13’ To end
Following Instruction 98
(255 character limit):
Base 10 value of ASCII character (see Appendix E)
‘00’ To end
Input locations altered: 0
Instruction 64: Paroscientific ‘T’ Series Processing
Instruction 64 processes measurements made on the Paroscientific ‘T’ Series
pressure transducer. The transducer outputs a temperature frequency and a
pressure frequency. The frequencies are measured using the Period Averaging
instruction (Instruction 27) which returns the period of the temperature and
pressure signals in microseconds. Instruction 64 converts period to temperature
and pressure according to the following relationships provided by Paroscientific.
Pressure (psi) = C * (1 - T
0
2
/Tau
2
) * (1 - (D * (1 - T
0
2
/Tau
2
)))
Temperature (
°
C) = Y
1
U + Y
2
U
2
+ Y
3
U
3
where, C = C
1
+ C
2
U + C
3
U
2
(psi),
T
0
= T
1
+ T
2
U + T
3
U
2
+ T
4
U
3
+ T
5
U
4
(microsecond),
D = D
1
+ D
2
U (microsecond),
U = U(t) - U
0
(microsecond),
Tau = measured pressure (microsecond),
U(t) = measured temperature (microsecond).
Values for the calibration coefficients (U
0
, Y
1
, Y
2
, Y
3
, C
1
, C
2
, C
3
, D
1
, D
2
, T
1
, T
2
,
T
3
, T
4
, T
5
) are provided by Paroscientific.
Instruction 64 has two parameters as shown below.
PARAM.
DATA
NUMBER
TYPE
DESCRIPTION
01:
4
Start Loc: U(t), Tau, U0..T5
02:
4
Result Loc: Temp(
o
C), Pressure(psi), Signature
Parameter 1
- U(t), Tau and 14 coefficients provided by Paroscientific must be in
contiguous input locations starting at the location entered in parameter 1.
Parameter 2
- The results of Instruction 64: (temperature in
°
C, pressure in psi,
and the signature of the 14 coefficients) are stored in three contiguous input
locations starting at the location entered in parameter 2.
