NEC Display Solutions of America, Inc.X552S Installation Guide55” LCD Display Rev 1.0www.necdisplay.com X552S Page 8 of 8Control Codes:NOTE: Contact your NEC rep for codes not listed.NOTE: Use a cross/reverse/null modem cable.Cable Connection:Communication Protocol:Interface: RS-232C Parity: NoneCommunication: Asynchronous Stop Bit: 1 bitBaud Rate: 9600 bps Communication Code: HexData Length: 8 bitsPC Control Connector (D-Sub 9P)NOTE: If so desired, jumper “Request to send” and “Clear to Send” together on both ends of the cable to simplify cable connection.These connections are not required. The only connections required are pins 2 (TxD), 3 (RxD) and 5 (GND).