NEC LT84/LT140 - Manual (Page 43)

E–43
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 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: Lamp cover is not attached correctly
Bit 1: Fan stoppage
Bit 2: Overheated
Bit 3: Lamp lighting failure
1 2
5 4 3
6
7
8
To RxD of PC
ᮣ
PC Control Connector (DIN-8P)
To TxD of PC
ᮤ
To GND of PC
ᮣ