TR-HT2xx LED Controller - User Manual
8.3.3
Resync flag (R)
Reject gate operation usually needs to be synchronised to the original
product trigger. However image processing can take a variable length of
time to complete, so rejects based on when the processing result is
available cannot be accurately timed. The Resync flag allows pass/fail
results to be re-synchronised to the original trigger.
There are two types of reject gate:
A pulse is required to reject a product (set the
P
flag)
A pulse is required to stop a product being rejected (don’t set the
P
flag)
The Resync Flag should be used with the Ethernet Message flag,
E
. The
host computer receives a tag number message, processes the image and
sends a pass/fail result (as an
SN
command) back to the TR-HT. The
TR-HT matches the message to the original trigger and time the pass/fail
output pulse accurately.
If an
SN
command is not received in time, then the product is rejected,
and an error code output.
8.3.4
Pulse flag (P)
The Pulse flag is used to select whether a pulse is needed to reject or to
accept a product when the Resync flag is set. When not set, a pulse is
required to reject product. If a pass/fail message is not received in Resync
mode, the TR-HT defaults to rejecting the product.
8.4
Virtual outputs
In addition to its four physical outputs, the TR-HT has a further eight virtual
channels. These are numbered from 5 to 12.
Where physical channels are connected to an output of the device, virtual
channels have no physical output, but are otherwise identical to the
physical channels. They allow inputs to be propagated though the system,
setting parameters such as pulse width and delay. Virtual channels can
then be connected to the physical channels to give a physical output.
When using the output from a channel as the input to another channel, the
input channel number is calculated as 4 + the input channel number. For
example, to use the output from channel number 4 you would use the
input channel number 8.
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