Sierra Video SVG Multi-Viewer - Manual (Page 60)

SIERRA VIDEO
50
Dynamic UMD Protocol
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| HEADER | CONTROL BYTE | DISPLAY DATA |
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Header = Display address (0-126) + 80 hex
(1 byte) (Control byte and display data will be sent)
Control (1 byte)
bit 0 = tally 1 (1=on, 0=off)
bit 1 = tally 2 (1=on, 0=off)
bit 2 = tally 3 ( 1=on, 0=off )
bit 3 = tally 4 ( 1=on, 0=off )
bits 4-5 = brightness data
bit 4 = 0, bit 5 = 0 (0 brightness)
bit 4 = 0, bit 5 = 1 (1/7 brightness)
bit 4 = 1, bit 5 = 0 (1/2 brightness)
bit 4 = 1, bit 5 = 1 (full brightness)
bit 6 = reserved (clear to 0)
bit 7 = cleared to 0
Display Data (16 bytes) = 16 displayable ASCII characters in the range 20 hex to 7E hex.
All 16 characters must be sent.