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Attaching Devices to the Asynchronous Serial Interface

7-8 Peripherals Configuration (R1001H) HP-UX version 11.00.01

To set up the modem through the SAM interface, determine the following:

■ the hardware path (including the instance number and port number) of the

asynchronous serial interface to be used by the modem (by entering the

ioscan -C tty command)

■ the modem’s baud rate

■ whether the modem will be used for outgoing calls

■ whether the modem will receive incoming calls

■ whether the modem requires CCITT (required only by certain European

government protocols). For standard Hayes™-compatible modems that use

CCITT modulation and compression standards, do not use CCITT mode. See

the modem(7) man page for details of RS-232C signaling for simple and CCITT

modems.

■ whether you need to configure for UUCP connectivity

If you do not use the SAM interface to configure your modem, use the mksf

command to create device special files specifically for modem use. The mksf

utility provides options for CCITT for special European protocol requirements

(most U.S. customers should not use the CCITT option). Use the -i option for a

UUCP dialer (used with access mode 0) and for hardware flow control (an

alternative to XON/XOFF pacing).

Use your modem hardware documentation as your primary resource for setting

switch positions and commands for proper functioning of your modem. However,

the following modem information is specific to the HP-UX operating system:

■ The modem should use auto-answer when DTR is raised, and hang up the line,

disable auto-answer, and return to command state when DTR is dropped. The

modem should perform power-on reset when DTR is dropped, as some

modems temporarily raise CD during reset. (On Hayes modems, do not use

AT&D3.)

■ The modem should assert carrier detect only when there is a carrier. It should

drop CD when carrier is lost. (This is the AT&C1 setting on the Hayes modem.)

■ The modem should pass through BREAK. The <Break> key is used for the

interrupt signal as well as for baud-rate switching.

■ Modem speed between the modem and the terminal should be known.

However, speed can be adjusted in modem-to-modem connections by using

the modem’s autobaud speed detection. Initially, features such as hardware

flow control (CTS/RTS) and error correction should be turned off. Once you

have established that the modem communicates correctly, add these features

one at a time.

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Seagate ST118273WC Guía de usuario Pagina 80