Highland T560 - Clock Commands

28 T560MANK5.DOCX
If the gate is configured as an input, a true level allows triggers and a false level disables
them. If BURST is also enabled, then whenever the input level is in the trigger disable
state, the burst counter logic is reset; the next time gate goes true, the burst logic will
immediately enable a group of N triggers.
If gate is set to be an output, it will go active (high or low, as programmed) whenever the hit
flipflop is armed to accept triggers. So in burst mode, it will go true during the active “N”
pulses of the burst sequence. If a trigger divisor is programmed, it will go high only when
the divisor enables triggers.
GAte OFf
disable
g
ate functions
GAte OUtput
make gate connector an output. The output level will be true when
the hit flipflop is enabled to accept tri
gg
ers
GAte INput
make gate an input. When the external TTL level is true, triggers
will be enabled.
GAte POs
g
ate in/out is active hi
g
h
(
normal
)
GAte NEg
g
ate in/out is active low
(
inverted
)
GAte TErminate
g
ate input is terminated at 50 ohms
GAte HIz
g
ate input is 1K to +5 volts
GAte BUrst
enable sin
g
le burst at
g
ate input rise
GAte REmote
enable single burst on GATE FIRE command
GAte FIre
fire a sin
g
le burst
GAte
g
ate setup quer
y
. Returns...
Gate OFF POS HIZ Shots
0
00000006
6
4.6.6.CLOCK COMMANDS
T560 timings are based on an internal 10 MHz crystal oscillator clock. The function or the
CLOCK coaxial connector is controlled by this group of commands. If the connector is
declared to be an input, the T560 accepts a 10 MHz TTL square wave input, or a sine wave
of about 1 volt RMS, and will lock its crystal oscillator to this source. If the connector is set
to be an output, the local 10-MHz oscillator frequency will be output from this connector.
The value used to trim the internal oscillator frequency is an integer in the range 0 to 4095,
with 2048 being roughly the nominal center frequency. Since the internal crystal oscillator
might be expected to drift 1-2 ppm per year, users may wish to occasionally trim its
frequency if precise delays are required.
Clock-group serial commands are...
CLock HIz
clock connector is unused
CLock OUt
connector outputs internal 10 MHz oscillato
r
CLock IN
external 10 MHz is accepted; oscillator phaselocks
CTrim 2048
sets 10 MHz clock trim, 0...4095, about 0.1 ppm/lsb
CTrim
queries clock trim value
CLock SAve
save clock trim to flash memor
y
. This value will be restored at powerup
CLock
quer
y
clock settin
g
s; returns...
Clock OUT Trim 02048 Temp +32.4