VPL-PX20, VPL-PX30, VPL-VW10HT - Sony Projector Service Manual (repair manual). Page 11

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VPL-PX20/PX30

VPL-VW10HT

. When sending a command from CONTROLLER, the return data (CMD1 = 10 hex or CMD1 = each

category value, CMD2 = 03 hex) from PROJECTOR should be received first before sending the next
command. Even if the next command is sent before receiving the return data, since PROJECTOR will

not be able to receive that command, it does not return a response to CONTROLLER. Consequently, no

error code is also sent.

The following lists the approximate waiting times for PROJECTOR to return the return data after

CONTROLLER sends the command.

. When a communication error occurs, PROJECTOR ignores the data received until now, and set into the

reception standby state.

. For undefined commands or commends determined as invalid by PROJECTOR, PROJECTOR will

send the “NAK” return data to CONTROLLER .

. Take note that when data is written when the input signal of PROJECTOR is unstable, that data (value)

will not be incorporated.

. When INDEX specified SIRCS direct command (CMD1 = 17 hex) is transmitted, leave an interval of

45 mSec until the next transmission. (Do not return the return data (ACK, NAK) when the SIRCS

direct command is received.)