evertz Quartz D9 - Timing (Embedded Control Systems)

Application Note 65
Quartz Routing Switcher Remote Control Protocol
Revision 1.4 Page - 21
7. TIMING (EMBEDDED CONTROL SYSTEMS)
With an embedded control system (V5 firmware) operating at 38400 baud the system can cope with an
overall crosspoint set rate of one change every 16ms when the serial link is directly into the master. For
links into slave devices the timing and crosspoint set rate are dependent on the number of Q-Link
devices.
Video switches
here (line 6)
Vert
Sync
RS-232
Data
Variable
Line 6
Line 319
Line 6
0.5 to
15.5ms
2.9ms (SV001,00x)
3.13ms (SVA001,00x)
at 34800 baud
The delay between the vertical sync and the RS232 message can be adjusted from 0.5ms to 12ms and
this has no effect on the video switch point. Delays between 12ms and 18ms cause the video to start
switching in this frame OR the next frame some of the time. A delay beyond 19ms causes the video
always to switch in the next frame.
Transmit times (calculated and tested):
Baud Rate
Serial Format
1 byte time
12 byte time
38400
1 start, 7 data, 1 stop
0.234ms
2.80ms
38400
1 start, 8 data, 1 stop
0.260ms
3.12ms
9600
1 start, 7 data, 1 stop
0.938ms
11.26ms
9600
1 start, 8 data, 1 stop
1.041ms
12.49ms
The current message structure packs the destination and source numbers out to 3 digits (001, 002).
The router will allow numbers without leading zeros (1,2).
Leading zeros can be removed which will vary the message length from 7 bytes (.SVA1,2cr) to 10
bytes (.SVA32,32cr). At 38400, 7 data this gives a message time of between 1.872ms and 2.340ms.
This will also slightly reduce the routers internal processing time.
On an eight level system of 128x128, the maximum message length will be 18 bytes e.g.
.SVABCDEFG123,123cr.