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Proceed as follow :
- Select a source.
- Adjust the audio pre-fading with the "+" and "-" pre-fading button. The adjusted level
will be memorized by the RCVDS05 and recalled every time this source is selected.
During an adjustment, the RCVDS05 will display a number between 1 and 10 followed
by a point.
E. Operating the RCVDS05 with the central computer.
The RCVDS05 can be controlled by a central computer when using :
* the Projector Control Software. With the simulated RCU on the computer display,
image settings and source selections are possible.
or
* a custom written program. Therefore, the communication protocol is given.
E.1. Communication protocol.
As already explained each RCVDS05 should have an unique address. The commu-
nication-settings are defined as fommows: -Baudrate 9600
When transmitting data from the computer to the RCVDS05, the transmission is
started using the STX byte(02H). After the STX byte, an address byte is transmitted
by the computer. All RCVDS's and Projectors compare this address byte with their
own address. The one which recognises its address will interpret the following bytes
and execute the commands requested by the computer.
If 02H (STX) appears in the data bytes following STX, the RCVDS05 or Projector
which did not recognise their address will be confused. They might interpret the
following bytes in a wrong way, reacting unpredictably.
To avoid this, a protocol is used which avoids the appearance of 02H (STX) in the
data bytes.
The protocol introduces an offset byte in the transferred bytes OFFS.
ADRo, DAT1o...DATno are bytes which are "encoded" in a way that none of them is
equal to 02. Their relation with the original bytes is :
ADRo = ADR + OFFS
DATio = DATi + OFFS
STX
ADR
CMD
DAT1 Data byte 1
DAT2 Data byte 2
DAT3 Data byte 3
DAT4 Data byte 4
CHKS Check sum
58
start byte
addresss byte
command
OPERATING INSTRUCTIONS
- no parity
- 1 stopbit
- 8 Databits
R5975765 RCVDS05 020997
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