35
RS-422 Transmission Settings
The
Route
and
Switching Mode
settings allow you to minimize I/O delay or to prevent data
loss or corruption during switches.
They can be set in the [Web-based Control:
RS-422 Settings
page].
To transmit data with minimum delay:
>> Select
Direct
under
Route
.
To guarantee transmission reliability:
>> Set
Switching Mode
to
ON
and specify
Data Rate
,
Parity
and
Stop Bit
.
The table below shows details on how data switches are performed within the same card or
between cards depending on the Route and Switching Mode settings.
Route Setting
Direct
Via Main MTX
Within a card
Between cards
Within a card
Between cards
Switching
Mode
Setting
ON
I/O delay: Large
Asynchronous
Data loss: No
I/O delay: Large
Asynchronous
Data loss: No
OFF
I/O delay: Small
Asynchronous
Data loss: Yes
I/O delay: Large
Asynchronous
Data loss: Yes
I/O delay: Large
Synchronous
Data loss: Yes
I/O delay: Large
Synchronous
Data loss: Yes
I/O delay:
The minimum delay is approx. 190 nsec (Small) when an input and output ports are on the
same card. In other cases, the delay becomes larger, from 0.8 msec (Large).
Synchronous / Asynchronous
: This indicates whether data switches are always synchronizes with
audio and video switches. “Asynchronous“ means data switches may be delayed by one field (or one
frame) relative to video or audio switches.
Data loss
: This indicates whether data loss can occur during switches.
