Grass Valley Performer-HD - Manual (Page 50)

3-18 Performer-HD Instruction Manual
Section 3 — Operation and Maintenance
SMPTE information fields implemented by Performer-HD are listed in
Table 3-10 .
SMPTE Message Processing
Message processing uses a buffer that can contain up to 200 bytes to hold
outgoing messages. All messages waiting to be sent are concatenated to-
gether into a single message block not surrounded by a Block command
(see below), which is placed in the message buffer and sent at the next mes-
sage send time. The controlling machine must therefore be careful not to re-
quest too much information at one time, lest it overflow the buffer. If this
buffer does overflow before the bus controller polls and responds to the
router service request to send the data, the entire buffer contents are cleared
and replaced with a system service error (
SERR ) message indicating buffer
overflow.
Table 3-10. SMPTE Information Fields Implemented by Performer-HD
Byte Full Name Type/Value
21 Virtual Machine Type Common, 8-bit unsigned = 05
22 Equipment Type Common, Byte Count/ASCII chars: Performer-HD\r07XXXX-00 VERS 1.0
27 Virtual Machine Status Common, 8-bit unsigned=02 (available)
41 Matrix Pointer Type-Specific, 1 byte, 00 or FF: 00=this Performer matrix; FF=all matrices
42 Level Pointer Type-Specific, 1 byte, 00-02 or FF:
00=video
01=audio 1
02=audio 2
FF=all levels
43 Source Pointer Type-Specific, 2 bytes,0000-0009 or FFFF:
0000-0009=source
FFFF=all sources
44 Destination Pointer Type-Specific, 2 bytes, 0000 or FFFF
0000=this Performers destination
FFFF=all destinations
46 Destinations to Source Type-Specific, 4 or 5 bytes: matrix, level, source, 0/1:
0=no connection
1=next 2 bytes give destination (0000)
47 Sources to Destination Type-Specific, 4 or 5 bytes: matrix, level, destination, 0/1:
0=no connection
1=next 2 bytes give source (0000-0009)
4A Level Configuration Type-Specific, 11 bytes:
matrix=00
level=00-02
min source=0000
max source=0009
min dest=0000
max dest=0000
nonexistent block count=00