null modem

(redirected from Null-modem)

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 ?
GIGE Host Interface: For added convenience, IP Address set-up menus are available on the front panel of the SierraNet eliminating the time and complexity required to configure an analyzer via a null-modem cable and hyper-terminal interface.
This product can be used with a hardware null-modem (COM port - RS232) cable or Network for TCP/IP.
Smart dongles are connected to host terminals using a three-wire null-modem serial RS-232 interface, which is used for transferring data, command and control, and firmware updating.
Memec Unique's multi-channel UART evaluation kit bundles a MUART evaluation board, AC/DC wall adapter, two null-modem DB9F-DB9F cables, software for the Ubicom PhantomServer, and full documentation, including schematics and build files.
Required for Multiplayer Option: 100% Hayes-compatible 9600 modem or faster (2 players), null-modem serial cable (2 player) and IPX network (2 to 8 players).
These functions take advantage of wireless infrared connectivity, hard wire connections using serial and parallel null-modem cables or even remote modem connectivity.
The FSM726S includes everything needed to stack and/or rack-mount the switch: a stacking cable, the hardware for installation in a 19-inch rack, as well as a null-modem cable and NETGEAR's 5-year warranty.
Wireless service providers can view these HTML pages through a direct serial connection between a laptop and the ICU using a null-modem cable.