NEC NP2250 - Manual (Page 173)

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9. Appendix
NOTE 1: Pins 1, 4, 6 and 9 are no used.
NOTE 2: Jumper “Request to Send” and “Clear to Send” together on both ends of the cable to simplify cable connection.
NOTE 3: For long cable runs it is recommended to set communication speed within projector menus to 9600 bps.
1 5 2 4 3
6 7 9 8
To GND of PC
To RxD of PC
To TxD of PC
To RTS of PC
To CTS of PC
PC Control Connector (D-SUB 9P)
Cable Connection
Communication Protocol
Baud.rate........................................... .38400.bps
Data.length........................................ 8.bits
Parity................................................. No.parity
Stop.bit............................................. One.bit
X.on/off............................................. None
Communications.procedure.............. Full.duplex
NOTE: Depending on the equipment, a lower baud rate may be recommended for long cable runs.