Philips 6652C - Programming Instructions

PROGRAMMING INSTRUCTIONS
The counter is instructed to perform various
measurements when it receives appropriate pro-
gramming codes (the counter is "listening" to
the c ontroller).
The programming code is a string of one or seve-
ral ASCII c haracters. The first character is al-
ways alphabetic, and the string is terminated by
a delimiter sent out from the controller.
Input delimiters
The PM 6652,-54 can accept six different input
string delimiters, and will thus recognize pro-
gramming messages sent from any controller.
m
ne feed)
arrige return)
ETX (E nd of text)
ETB (End of text block)
(Comma)
(Semicolon)
Programming code format
The numerical values for measuring time, trigger
levels and math constants K and L can be repre-
se nted in accordance to all three standardized
(IEC-625-2) formats NR1, NR2 or NR3.
NR1: Integer value (without decimal point).
NR2: Scaled (with floating decimal point).
NR3: Exponential notation with floating d eci mal
point and exponent. Preferred exponent
values are multiples of ±3. However, the
count er also accepts exponent values other
than multiples of ±3.
Example: A measuring time of 1.5 scan be repre-
sented as SM1.5, SM15 E-1 or SM0.015
E2.
If a programming string contains several func-
tions, for example: Period measurement (code
F3) ,
hold-off active (c ode HE1), measuring time
2 s (co de 5M2), the different programming codes
can be
separated by commas (F3,HE1,SM2), by
spaces ( f3 H£1 5M2) or not separated at all
(F3HE1SM2) . Spaces can be inserted anywhere in
the programming string, e.g. (F 3 HE 1 SM 2).
Programming codes
The programming codes are shown on the next
page. Note that frequency A measurements for the
PM 6652 can be performed in two different ways:
- Automatic
choice of reciprocal mode (below
10 MHz ) or conventional mode (above 10 MHz),
code F1.
Always
reciprocal mode, code F1G3.
The PM 6654 always uses reciprocal frequency
mode.
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