null modem


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null modem

(communications, hardware)
A cable, especially an EIA-232 cable, for connecting serial ports on two computers directly, rather than via modems. Since, according to the specification, both computers should transmit on pin three of their EIA-232 connectors and receive on pin two, a null modem cable needs to connect one computer's pin two to the other's pin three and vice versa. It also needs to have male connectors at both ends (again, according to the specification).
References in periodicals archive ?
Also, there is a lifetime warranty on cables, null modem adapters, wire terminals and other non-electronic products along with lifetime support.
This system has been tested; it has been found that it's highly reliable for null modem connection by using two external extra wires through RS 232.
A modem cable has the wires in the cable going straight through, whereas a null modem cable has the transmit and receive lines (as well as the handshaking lines) crossed in the cable.
(FTDI) announced its USB NMC-2.5m USB to USB Null modem cable that offers a quick and convenient method of inter-PC communication using USB ports.
Required for Multiplayer: Type and frequency of processor: Pentium 200 MHz (or compatible); 1 CD Per PC for all multiplayer modes; 2 to 8 players: Via local network: IPX or TCP/IP (requires network card) or Via Internet: TCP/IP or IPX (requires at least a 28.8 kbps modem and Internet Service Provider); 2 players: Via direct modem connection (requires a 28.8 kbps connection) or Via serial cable link (requires null modem cable and 16550 UART high speed serial port)
NULL MODEM: Direct cable connection between two computers using their serial ports.
disk and I'll load it at home or I can carry a null modem cable with appropriate file-transfer software.