NEC MultiSync P654Q User Manual page 52

1) Interface
PROTOCOL RS-232C
BAUD RATE 9600 [bps]
DATA LENGTH 8 [bits]
PARITY NONE
STOP BIT 1 [bit]
FLOW CONTROL NONE
This LCD monitor uses RXD, TXD and GND lines for RS-232C control.
The reverse type cable (null modem cable) (not included) should be used for RS-232C control.
2) PIN ASSIGNMENT
RS-232C input/output
Pin No Name
1 NC
2 RXD
3 TXD
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC
This LCD monitor uses RXD, TXD and GND lines for RS-232C control.
D-SUB 9P (Monitor side)
1
6
English-50
5
9