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R5976214 VisuPlus Video Insertion Unit June 2003
6-4
6.4 VISU
PLU S
Operation Protocol
The V
ISU
PLUS
-operation protocol is completely ASCII based. Characters are placed in capitals.
Numbers are transferred as ASCII coded words (example number -128 is transferred as ASCII(-
128)). Every command (send from host computer or returning from V
ISU
PLUS
) must end with a
<CR>. The protocol runs on a baudrate of 9600, 19200 or 38400 with (preferred) or without hard-
ware handshaking (RTS/CTS).
Multiple V
ISU
PLUS
are placed in a chain and all the configuration commands must be send to the
first V
ISU
PLUS
in the chain. This VISU
PLUS
takes care of the communication towards the other
V
ISU
PLUS
.
One command cycle can be separated into several parts:
Command send to first V
ISU
PLUS
in chain.
Write command: Error and/or Info messages coming back from first V
ISU
PLUS
in chain.
Read command: Return value coming back from first V
ISU
PLUS
in chain.
ACK / NACK coming back from first VISU
PLUS
in chain.
6.4.1 Error / Info messages
An info message gives information about the currently executed command.
Syntax:
VISU INFO VISU <VisuNr>: <InfoMessage> <CR>
An Error message gives error information about the currently executed command.
Syntax:
VISU ERROR VISU <VisuNr>: <ErrorMessage> <CR>
6.4.2 Return value
A return value comes back when the VISU
PLUS
is executing a read command.
Syntax:
VISU <ReturnValue> <CR>
6.4.3 ACK / NACK
Every command send to the VISU
PLUS
is acknowledged (ACK) or not acknowledged (NACK) by this
V
ISU
PLUS
. You get an Acknowledge when no error has occurred during the execution of a com-
mand. You can get a not Acknowledge when an error has occurred during the execution of a
command.
Syntax:
VISU ACK <CR>
VISU NACK <CR>