Doremi HDG-20 - Manual (Page 23)

11 Appendix E: VANC Counter
For 1080i-59.94 formats, when VANC is enabled, the HDG-20 can embed up to 4 data packets
on each of the following lines:
 Field-1: Lines 9 to 20
 Field-2: Lines 572 to 583
All packets are identical except for UDW0, UDW1 and CS that are used to indicate the line
number, packet number / field identifier and the checksum. The packet is structured as follows:
ADF1= 0x00
ADF2= 0xFF
ADF3= 0xFF
DID= 0x5F
SDID= 0xFA
DC=
0xFF
UDW0= LSB byte of the line number
UDW1= Packet Number and Field Identifier, 0x30 for packet-3 field-1 or 0x2F for packet-2
field-2
UDW2 .. UDW254= Hex value of a counter that starts at 0x00 and ends 0xFC
CS= Checksum
HDG.OM.000248.DRM Page 23 of 24 Version 1.6
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