Communication Procedure; Outline Of Communication; Communication Rules; Approximate Return Waiting Times - Sony VPL-VW95ES Protocol Manual

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3-3. Communication Procedure

All communication between CONTROLLER (PC, etc.) and DEVICE (PROJECTOR) is performed by the

command block format. Communication is started by the issue of a command at CONTROLLER and

ended when the return data is sent to CONTROLLER after DEVICE receives the command.

CONTROLLER is prohibited from sending several commands at one time. This means that after CON-

TROLLER sends one command, it cannot send other commands until DEVICE returns the return data.

DEVICE sends the return data after processing the command. The time from when CONTROLLER sends

the command until the return data is returned differs according to the contents of the command.

When Sircs Direct Command is sent, return data is not sent.

. When sending a command from CONTROLLER (PC, etc.), the return data from DEVICE (PROJEC-

TOR) should be received ﬁ rst before sending the next command. Even if the next command is sent

before receiving the return data, since DEVICE will not be able to receive that command, it does not

return a response to CONTROLLER. Consequently, no error code is also sent.

For detail of the waiting times for DEVICE to return the return data after CONTROLLER sends the

command, refer to the section 3-5.

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

reception standby state.

. For undeﬁ ned commands or commands determined as invalid by DEVICE, DEVICE will send the

"NAK" return data to CONTROLLER .

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

not be incorporated.

. When INDEX speciﬁ ed SIRCS direct command 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.)

The await-return time is approx. 30 to 3200 msec.

This is the case, unless the communications are interfered anyway.

12 (E)

VPL-VW95ES

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