Sierra Video 503108 RS-232 - Manual (Page 5)

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Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • (530) 478-1000 • Fax (530) 478-1105
503108 RS-232 INTERFACE
Leader and Trailer
All commands to the router and responses from
the router are sent between a message leader and a
message trailer. “**” is the leader and “!!” is the
trailer.
The simplest possible command string would be
“**!!”, which consists of the leader and trailer
characters but no command between them. This
command string would generate the response
“**OK!!” followed by “CR”. This can be useful
for verifying that the serial link to the switcher is
operational.
Below is the complete command set, a subset of
which may be implemented in any given routing
switcher:
All SVS routing switchers implement the “I”,
“L”, “S”, and “X” commands .
“I”: Capabilities Inquiry
The command “I” requests that capability infor-
mation be returned to the host. The information is
sent as a string of characters. The first characters
are a space followed by “I”, the next characters
are the command letters that are implemented as
commands, and the last character is “~” (tilde).
Syntax Example Description
I I Capabilities inquiry.
L L Matrix size and level names inquiry.
S S Status inquiry.
CLEAR CLEAR Clear matrix.
U {0 | 1} U0 Update request on/off.
X out, in, lvl X12,9,2 Connect crosspoint.
V out, in, in... V3,1,2,2 Connect levels.
W lvl, in, in... W1,4,19 Connect outputs.
Y out, in Y1,7 Connect AFV.
Z in, in... Z13,12,8 Connect AFV.
D numsyncs D300 Delay vertical sync intervals.
P {A-Z} PBY1,7~ Preset a connect sequence.
T {A-Z} TB Trigger a preset sequence.
For example, the command:
**I!!
might return the following string:
**IILSX~ OK !!<CR>
indicating that the switcher supports the “I”, “L”,
“S”, and “X” commands from the host.
“L”: Matrix Size and Level Names Inquiry
The command “L” requests that matrix size and
level name information be returned to the host.
The information is sent as a string of characters.
The first characters are a space followed by “L”,
then the number of outputs, a comma, the number
of levels, a comma, the number of inputs, a comma,
and then the level names, each terminated by a
“~” (tilde), and the last followed by two tildes.
The number of level names will be the same as the
number of levels that was given in the response.
Valid characters for level names are any printable
ASCII character (including SPACE) except “**”
(asterisk), “~” (tilde), and “!!” (exclamation mark).
The number of characters may be no more than 6.