Nec MT 1020G /820G User Manual download pdf (Page 37)

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To RxD of PC

PC Control Connector (DIN-8P)

To TxD of PC

To GND of PC

Cable Connection

Communication Protocol

Baud rate: 9600 bps

Data length: 8 bits

Parity: No parity

Stop bit: One bit

X on/off: None

Communications

Full duplex

procedure:

If the CPU of the LCD projector has received the data correctly, it returns an ACK(C5H). If the received data is not correct,

the CPU returns a NAK(CAH), then the following status:

Receiving success: C5

Receiving failure: CA Err

Err 01: Command Error (command not supported)

Err 02: Checksum Error

Err 03: Busy (command not acceptable)

Err 04: Parameter Error ( parameter data abnormal)

NOTE: If failing in powering-on, the CPU returns the following NAKs:

CA Err 1

Err 1 8X (Apply the corresponding bit.)

Bit 0: Either filter panel or lamp cover is not

attached correctly

Bit 1: Fan stoppage

Bit 2: Overheated

Bit 3: Lamp lighting failure

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Nec MT 1020G /820G User Manual Page 37