Null Modem-0812 page 1/1 2008 B&B Electronics. All rights reserved MFNM25, MMNM25, MF23R25, MFDTE25, MMNM9 RS-232 Null Modem Adapters Interconnect two devices with similar ports Reverse Pin 2 (TD) and Pin 3 (RD) Multiple Pin Arrangements Null modem adapters are used to connect two DTEs (computer, terminal, printer etc.) directly using a RS- 232 serial cable. The original RS-232 standard only defined the connection of DTEs with DCEs (i.e. modems). With a null modem adapter, the transmit and receive lines are cross-linked. Depending on the purpose, one or more handshake lines are cross-linked. Several wiring layouts are in use because the null modem connection is not covered by a standard. B&B Electronics Null Modem adapters come with a variety of connector options and pin-outs to cover most common applications. www.bb-elec.com orders bb-elec.com support bb-elec.com International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104 European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445 PRODUCT INFORMATION B&B ELECTRONICS