FDI2056 Use
r’s Manual
v 2.0 r 1.1
– 03/13
Copyright © 2013 Metrolab Technology SA
47
www.metrolab.com
where:
s = + or -
the direction of the movement (d)
a = value
the absolute position of the first trigger condition (default 0)
ni = 1 to 65535 or * the number of intervals of Ci pulses or counts.
'*' means infinite number of intervals.
Ci = 1 to 2
23
the number of encoder pulses or time counts between
triggers (always positive)
i = 1 to 20
the number of different measurement parameters pairs.
An infinite number of integration intervals can be selected in the TRI sequence
(ni=*). This means that once the run is started it will continue until a break
command
–
BRK
– or a “buffer full” condition occurs. Any length of integration
period (within the limits 1 - 2
23
pulses or milliseconds) can be associated with an
infinite sequence. Any finite sequence can precede an infinite sequence in the TRI
command, but the infinite sequence has to be the last one of the series. If the
reading of the measurement results is performed faster than the triggering, the
buffer will never get full and the run will last forever. If the
“last cumulative
storage” mode –
CUM
,1,L
– is selected, the instrument will behave as a fluxmeter.
To demonstrate the use of the
TRI
command, some examples are given below:
TRI,-,+500/4,15/10,2/1,100
CR
LF
TRI,,/5,200
CR
LF
equivalent to TRI,+,0/5,200
CR
LF
TRI,,50
CR
LF
this command will roughly move the
motor to the specified position without
performing
any
measurement.
The
accuracy of the positioning is very low.
TRI,,89/10,250/*,1000
CR
LF
start at the absolute position of 89 then
perform 10 sequences of 250 pulses then
an infinite sequence of 1000 pulses.
Trigger Source: Timer
4-9-1
The internally quartz controlled time base generator is set by default to operate at
a frequency of 1 [kHz] and is used to feed the FDI 2056 Trigger Factory. The
TRI
command defines the integration intervals in terms of number of periods
– As the
default frequency is 1 [kHz], you may consider this integration interval as the time
spent for each partial integral expressed in milliseconds. If you would like to
proceed to a faster integration time, change the default time base generator (see
section 1-).
The counter can be activated in two different ways: