Adding and configuring modems

Choosing which serial port to use

Before adding a modem, ensure there is a port available on your system -- either directly on the COM1 or COM2 serial ports, or on a third-party multiport card. If you are installing a supported modem, use the Device Configuration Utility to configure an SCO-supported serial card. Otherwise, you can use the Serial Manager to configure standard serial ports, or a vendor-supplied configuration utility for third-party intelligent serial port devices and drivers. See ``Configuring serial ports'' for more information.

Many internal modem cards allow configuration on COM3 and COM4 serial ports. To configure the COM3 and COM4 serial ports, use the Device Configuration Utility. Plug and Play ISA modem cards can be configured using the PnP Configuration Manager.

For systems with two dumb (non-intelligent) single-port serial cards, /dev/term/00t and /dev/term/01t are the non-modem control devices associated with COM1 and COM2 respectively. /dev/term/00m and /dev/term/01m are the corresponding modem control devices for these ports. The operating system gives these ports different device names because it uses different device-driver routines for each.

NOTE: Always use the modem control device with a modem.

Vendors of multiport smart serial cards implement their own drivers and device naming schemes; consult the documentation supplied with your smart serial card for details.

Make sure the serial port you have chosen for your modem is recognized at bootup and, if the modem is internal, make sure that the interrupt vector (IRQ) and base I/O address of the COM port do not conflict with any other device.

If you attempt to use both modem and non-modem control ports at the same time you will see the warning:

   cannot open: device busy

© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 22 April 2004