26.4 ²¦Èë·þÎñ

Contributed by Guy Helmer. Additions by Sean Kelly.

¾¯¸æ: ´Ó FreeBSD 8.0 ¿ªÊ¼£¬ ÓÃÓÚ´®¿ÚµÄÉ豸½Úµã´Ó /dev/cuadN ¸ÄΪÁË /dev/cuauN£» ´Ó /dev/ttydN ¸ÄΪÁË /dev/ttyuN¡£ FreeBSD 7.X Óû§ÐèÒª¸ù¾Ýʵ¼ÊÇé¿ö¶ÔÕâ·ÝÎĵµÖеÄÀý×Ó½øÐбØÒªµÄµ÷Õû¡£

¡¡¡¡Îª²¦Èë·þÎñÅäÖÃFreeBSDϵͳÓëÁ¬½Óµ½ÖÕ¶ËÊǷdz£ÏàËÆµÄ£¬³ý·ÇÄúÕýÔÚʹÓà modemÀ´²¦ºÅ¶ø²»ÊÇÖÕ¶Ë¡£

26.4.1 ÍâÖÃvs.ÄÚÖÃmodem

¡¡¡¡ÍâÖÃmodem¿´ÆðÀ´ºÜÈÝÒײ¦ºÅ¡£ ÒòΪ£¬ÍâÖà modem ¿ÉÒÔͨ¹ý´¢´æÔÚ·ÇÒ×ʧÐÔµÄRAMÖеIJÎÊýÀ´ÅäÖ㬠ËüÃÇͨ³£ÌṩָʾÆ÷À´ÏÔÊ¾ÖØÒªµÄRS-232ÐźŵÄ״̬¡£ ²»Í£ÉÁ¹âµÄÐźŵÆÄܸøÓû§ÁôϱȽÏÉî¿ÌµÄÓ¡Ïó£¬ ¶øÇÒָʾÆ÷Ò²¿ÉÒÔÓÃÀ´²é¿´modemÊÇ·ñÕý³£µØ¹¤×÷¡£

¡¡¡¡ÄÚÖÃmodemͨ³£È±·¦·ÇÒ×ʧÐÔµÄRAM£¬ ËùÒÔ¶ÔËüÃǵÄÅäÖÿÉÄÜ»áÏÞÖÆÔÚͨ¹ý DIP ¿ª¹ØÀ´ÉèÖᣠÈç¹ûÄúµÄÄÚÖÃmodemÓÐָʾµÆ£¬ÄúÒ²ºÜÄÑ¿´µÃµ½¡£

26.4.1.1 ModemºÍÏßÀÂ

¡¡¡¡Èç¹ûÄúʹÓÃÒ»¸öÍâÖÃµÄ modem£¬ÄÇÄú½«ÐèÒªÊʵ±µÄµçÀÂÏß¡£ Ò»¸ö±ê×¼µÄ´®¿ÚÏßÓ¦µ±×ã¹»³¤ÒÔÖÁÆÕͨµÄÐźÅÄܹ»Á¬½ÓÉÏ£º

±í 26-4. ÐźÅÃû³Æ

Ëõд È«Ãû
RD ÊÕµ½Êý¾Ý (Received Data)
TD ´«³öÊý¾Ý (Transmitted Data)
DTR Êý¾ÝÖն˾ÍÐ÷ (Data Terminal Ready)
DSR Êý¾Ý¼¯¾ÍÐ÷ (Data Set Ready)
DCD Êý¾ÝÔØ²¨¼ì²â (Data Carrier Detect) (RS-232 µÄÊÕµ½Ïß·Ðźżì²âÆ÷)
SG ÐÅºÅµØ (Signal Ground)
RTS ÒªÇó·¢ËÍÊý¾Ý (Request to Send)
CTS ÔÊÐí¶Ô·½·¢ËÍÊý¾Ý (Clear to Send)

¡¡¡¡FreeBSD ¶ÔËٶȳ¬¹ý 2400 bps µÄÇéÐÎÐèҪͨ¹ý RTS ºÍ CTS ÐźÅÀ´Íê³ÉÁ÷¿ØÖÆ£¬ ͨ¹ý CD ÐźÅÀ´¼ì²âºô½ÐÏìÓ¦ºÍ¹Ò»ú£¬ ²¢Í¨¹ý DTR ÐźÅÀ´ÔڻỰ½áÊøÊ±¶Ôµ÷ÖÆ½âµ÷Æ÷½øÐи´Î»¡£ ijЩµçÀÂÔÚÁ¬½ÓʱûÓÐÌṩȫ²¿ÐèÒªµÄÐźţ¬ Õâ»á¸øÄú´øÀ´ÎÊÌ⣬ ÀýÈçÔÚ¹Ò¶ÏʱµÇ¼»á»°²»Ïûʧ£¬ Õâ¾ÍÓпÉÄÜÊǵçÀµÄÎÊÌâ¡£

¡¡¡¡ÓëÆäËüÀà UNIX® ²Ù×÷ϵͳÀàËÆ£¬ FreeBSD ʹÓÃÓ²¼þÐźÅÀ´¼ì²âºô½ÐÏìÓ¦£¬ ÒÔ¼°ÔÚ¹Ò¶Ïʱ¹Ò¶Ï²¢¸´Î»µ÷ÖÆ½âµ÷Æ÷¡£ FreeBSD ±ÜÃâ·¢ËÍÃüÁî¸øµ÷ÖÆ½âµ÷Æ÷£¬ »ò¼àÊÓÆä״̬¡£ Èç¹ûÄúÊìϤͨ¹ýµ÷ÖÆ½âµ÷Æ÷À´Á¬½Ó»ùÓÚ PC µÄ BBS ϵͳ£¬ Õâ¿ÉÄÜ¿´ÆðÀ´ÓеãÄÑÓá£

26.4.2 ´®¿ÚµÄ¿¼ÂÇ

¡¡¡¡FreeBSDÖ§³Ö»ùÓÚ NS8250£¬ NS16450£¬ NS16550 ºÍ NS16550A µÄEIA RS-232CͨѶ½Ó¿Ú¡£ 8250ºÍ16450É豸Óе¥×Ö·û»º³å¡£ 16550É豸ÌṩÁËÒ»¸ö 16 ¸ö×Ö·ûµÄ»º³å£¬ ¿ÉÒÔÌá¸ß¸ü¶àµÄϵͳÐÔÄÜ¡£ ÒòΪµ¥×Ö·û»º³åÉ豸±È 16 ¸ö×Ö·ûµÄ»º³åÐèÒª¸ü¶àµÄϵͳ×ÊÔ´À´¹¤×÷£¬ ËùÒÔ»ùÓÚ16550AµÄ½Ó¿Ú¿¨¿ÉÄܸüºÃ¡£ Èç¹ûϵͳûÓлµÄ´®¿Ú£¬ »òÓнϴóµÄ¸ºÔØ£¬ 16 ×Ö·û»º³åµÄ¿¨¶ÔÓڵʹíÎóÂʵÄͨѶÀ´Ëµ¸üºÃ¡£

26.4.3 ¿ìËÙÔ¤ÀÀ

¡¡¡¡¶ÔÓÚÖÕ¶Ë£¬ init »áÔÚÿ¸öÅäÖô®¿ÚÉÏΪÿ¸ö²¦ÈëÁ¬½Ó²úÉúÒ»¸ö getty ½ø³Ì¡£ ÀýÈ磬 Èç¹ûÒ»¸ö modem ±»¸½´øÔÚ /dev/ttyu0 ÖУ¬ÓÃÃüÁîps ax¿ÉÒÔÏÔʾÏÂÃæÕâЩ£º

 4850 ??  I      0:00.09 /usr/libexec/getty V19200 ttyu0

¡¡¡¡µ±Óû§²¦ÉÏmodem£¬ ²¢Ê¹ÓÃËü½øÐÐÁ¬½Óʱ£¬ CD Ï߾ͻᱻ modem Èϳö¡£ ÄÚºË×¢Òâµ½ÔØ²¨ÐźÅÒѾ­±»¼ì²âµ½£¬ ÐèÒªÍê³É getty ¶Ë¿ÚµÄ´ò¿ª¡£ getty ·¢ËÍÒ»¸öµÇ¼£ºÔÚÖ¸¶¨µÄ³õʼÏßËÙ¶ÈÉϵÄÃüÁîÐС£ Getty »á¼ì²éºÏ·¨µÄ×Ö·ûÊÇ·ñ±»½ÓÊÕ£¬ ÔÚµäÐ͵ÄÅäÖÃÖУ¬ Èç¹û·¢ÏÖ ¡°À¬»ø¡±£¬ getty ¾Í»áÉè·¨µ÷½ÚÏßËÙ¶È£¬Ö±µ½Ëü½ÓÊÕµ½ºÏÀíµÄ×Ö·û¡£

¡¡¡¡Óû§ÔÚ¼üÈëËû/ËýµÄµÇ¼Ãû³Æºó£¬ gettyÖ´ÐÐ/usr/bin/login£¬ Õâ»áÒªÇóÓû§ÊäÈëÃÜÂëÀ´Íê³ÉµÇ¼£¬ È»ºóÆô¶¯Óû§µÄshell¡£

26.4.4 ÅäÖÃÎļþ

¡¡¡¡Èç¹ûÏ£ÍûÔÊÐí²¦ÈëÄúµÄ FreeBSD ϵͳ£¬ ÔÚ /etc Ŀ¼ÖÐÓÐÈý¸öϵͳÅäÖÃÎļþÐèÒªÄú¹Ø×¢¡£ ÆäÒ»ÊÇ /etc/gettytab£¬ ÆäÖаüº¬ÓÃÓÚ /usr/libexec/getty ·þÎñµÄÅäÖÃÐÅÏ¢¡£ Æä¶þÊÇ /etc/ttys£¬ ËüµÄ×÷ÓÃÊǸæËß /sbin/init ÄÄЩ tty É豸ÉÏÓ¦¸ÃÔËÐÐ getty¡£ ×îºó£¬ ¹ØÓڶ˿ڵijõʼ»¯ÃüÁ Ó¦·Åµ½ /etc/rc.d/serial ½Å±¾ÖС£

¡¡¡¡¹ØÓÚÔÚ UNIX ÉÏÅäÖò¦Èëµ÷ÖÆ½âµ÷Æ÷ÓÐÁ½ÖÖÖ÷ÒªµÄÁ÷ÅÉ¡£ Ò»ÖÖÊǽ«±¾µØ¼ÆËã»úµ½µ÷ÖÆ½âµ÷Æ÷µÄ RS-232 ½Ó¿ÚÅäÖÃΪ¹Ì¶¨ËÙÂÊ¡£ ÕâÑù×öµÄºÃ´¦ÊÇ£¬ Ô¶³ÌÓû§×ÜÄÜÁ¢¼´¼ûµ½ÏµÍ³µÄµÇ¼Ìáʾ·û£¬ ¶øÆäȱµãÔòÊÇ£¬ ϵͳ²¢²»ÖªµÀÓû§ÕæÊµµÄÊý¾ÝËÙÂÊÊǶàÉÙ£¬ Òò¶ø£¬ ÀàËÆ Emacs ÕâÑùµÄ³ÌÐò£¬ Ò²¾ÍÎÞ·¨µ÷ÕûËüÃÇ»æÖÆÆÁÄ»µÄ·½Ê½£¬ ÒÔ±ãΪÂýËÙÁ¬½Ó¸ÄÉÆÏìӦʱ¼ä¡£

¡¡¡¡ÁíÒ»ÖÖÁ÷Åɽ«µ÷ÖÆ½âµ÷Æ÷µÄ RS-232 ½Ó¿ÚËÙÂÊÅäÖÃÎªËæÔ¶³ÌÓû§µÄÁ¬½ÓËÙÂʱ仯¡£ ÀýÈ磬 ¶Ô V.32bis (14.4 Kbps) Á¬½Ó£¬ µ÷ÖÆ½âµ÷Æ÷»áÈÃ×Ô¼ºµÄ RS-232 ½Ó¿ÚÒÔ 19.2 Kbps µÄËÙÂÊÔËÐУ¬ ¶ø 2400 bps Á¬½Ó£¬ Ôò»áʹµ÷ÖÆ½âµ÷Æ÷µÄ RS-232 ½Ó¿ÚÒÔ 2400 bps µÄËÙÂÊÔËÐС£ ÓÉÓÚ getty ²¢²»ÄÜʶ±ð¾ßÌåµÄµ÷ÖÆ½âµ÷Æ÷µÄÁ¬½ÓËÙÂÊ·´À¡ÐÅÏ¢£¬ Òò´Ë£¬ getty »áÒÔ³õʼËٶȸø³öÒ»¸ö login: Ìáʾ£¬ ²¢¼ì²éÓû§µÄÏìÓ¦×Ö·û¡£ Èç¹ûÓû§¿´µ½ÂÒÂ룬 ÔòËûÃÇÓ¦ÖªµÀ´ËʱӦ°´Ï Enter ¼ü£¬ Ö±µ½¿´µ½¿ÉÒÔ±æÈϵÄÌáʾ·ûΪֹ¡£ Èç¹ûÊý¾ÝËÙÂʲ»Æ¥Å䣬 Ôò getty »á½«Óû§ÊäÈëµÄÈκÎÐÅÏ¢¾ùÊÓΪ ¡°ÂÒÂ롱£¬ ²¢³¢ÊÔÒÔÏÂÒ»ÖÖËÙÂÊÀ´Ôٴθø³ö login: Ìáʾ·û¡£ ÕâÒ»¹ý³Ì¿ÉÄÜÐèÒªÁîÈË×÷Å»µØÖظ´ÏÂÈ¥£¬ ²»¹ýÒ»°ã¶øÑÔ£¬ Óû§Ö»ÒªÇÃÒ»Á½Ï¼üÅ̾ÍÄÜ¿´µ½ÕýÈ·µÄÌáʾ·ûÁË¡£ ÏÔÈ»£¬ ÕâÖֵǼ¹ý³Ì¿´ÆðÀ´²»ÈçÇ°ÃæËù½éÉÜµÄ ¡°Ëø¶¨ËÙÂÊ¡± ·½·¨ÄÇÑù¼òµ¥Ã÷ÁË£¬ µ«Ê¹ÓõÍËÙÁ¬½ÓµÄÓû§£¬ È´¿ÉÒÔÔÚÔËÐÐÈ«ÆÁÄ»³ÌÐòʱµÃµ½¸üºÃµÄ½»»¥ÏìÓ¦¡£

¡¡¡¡ÕâÒ»½Ú½«¾¡¿ÉÄܹ«Æ½µØ½éÉܹØÓÚÅäÖõÄÐÅÏ¢£¬ µ«¸ü×ÅÁ¦ÓÚ½éÉܵ÷ÖÆ½âµ÷Æ÷ËÙÂÊËæÁ¬½ÓËÙÂʱ仯µÄÅäÖ÷½·¨¡£

26.4.4.1 /etc/gettytab

¡¡¡¡/etc/gettytabÊÇÒ»¸öÓÃÀ´ÅäÖà getty ÐÅÏ¢µÄ termcap ·ç¸ñµÄÎļþ¡£ Çë¿´¿´ gettytab µÄÁª»úÊÖ²áÁ˽âÍêÕûµÄÎļþ¸ñʽºÍ¹¦ÄÜÁÐ±í¡£

26.4.4.1.1 Ëø¶¨ËٶȵÄÅäÖÃ

¡¡¡¡Èç¹ûÄú°ÑÄúµÄmodemµÄÊý¾ÝͨѶÂÊËø¶¨ÔÚÒ»¸öÌØÊâµÄËÙ¶ÈÉÏ£¬ Äú²»ÐèÒª¶Ô /etc/gettytab Îļþ×÷Èκα仯¡£

26.4.4.1.2 Æ¥ÅäËٶȵÄÅäÖÃ

¡¡¡¡Äú½«ÐèÒªÔÚ /etc/gettytab ÖÐÉèÖÃÒ»¸ö¼Ç¼À´¸æËß getty ÄúÏ£ÍûÔÚ modem ÉÏʹÓõÄËÙ¶È¡£ Èç¹ûÄúµÄ modem µÄËÙÂÊÊÇ 2400 bit/s£¬ Ôò¿ÉÒÔʹÓÃÏÖÓÐµÄ D2400 µÄ¼Ç¼¡£

#
# Fast dialup terminals, 2400/1200/300 rotary (can start either way)
#
D2400|d2400|Fast-Dial-2400:\
        :nx=D1200:tc=2400-baud:
3|D1200|Fast-Dial-1200:\
        :nx=D300:tc=1200-baud:
5|D300|Fast-Dial-300:\
        :nx=D2400:tc=300-baud:

¡¡¡¡Èç¹ûÄúÓÐÒ»¸ö¸ü¸ßËÙ¶ÈµÄ modem£¬ ±ØÐëÔÚ /etc/gettytab ÖÐÌí¼ÓÒ»¸ö¼Ç¼¡£ ÏÂÃæÊÇÒ»¸öÈÃÄú¿ÉÒÔÒÔ×î¸ß 19.2 Kbit/s µÄÓÃÔÚ 14.4 Kbit/sµÄmodemÉϵĽӿڼǼ£º

#
# Additions for a V.32bis Modem
#
um|V300|High Speed Modem at 300,8-bit:\
        :nx=V19200:tc=std.300:
un|V1200|High Speed Modem at 1200,8-bit:\
        :nx=V300:tc=std.1200:
uo|V2400|High Speed Modem at 2400,8-bit:\
        :nx=V1200:tc=std.2400:
up|V9600|High Speed Modem at 9600,8-bit:\
        :nx=V2400:tc=std.9600:
uq|V19200|High Speed Modem at 19200,8-bit:\
        :nx=V9600:tc=std.19200:

¡¡¡¡ÕâÑù×öµÄ½á¹ûÊÇ 8-Êý¾Ý룬 ûÓÐÆæÅ¼Ð£ÑéµÄÁ¬½Ó¡£

¡¡¡¡ÉÏÃæÊ¹ÓÃ19.2 Kbit/sµÄÁ¬½ÓËٶȵÄÀý×Ó£¬Ò²¿ÉÒÔʹÓà 9600 bit/s (for V.32)£¬ 2400 bit/s£¬ 1200 bit/s£¬300 bit/s£¬ Ö±µ½ 19.2 Kbit/s¡£ ͨѶÂʵĵ÷½ÚʹÓà nx= (¡°next table¡±) À´ÊµÏÖ¡£ ÿÌõÏßʹÓÃÒ»¸ö tc= (¡°table continuation¡±) µÄ¼Ç¼À´¼ÓËÙ¶ÔÓÚÒ»¸öÌØÊâ´«ÊäÂʵıê×¼ÉèÖá£

¡¡¡¡Èç¹ûÄúÓÐ28.8 Kbit/sµÄmodem£¬»òÄúÏëʹÓÃËüµÄ 14.4Kbit/s ģʽ£¬ ¾ÍÐèҪʹÓÃÒ»¸ö¸ü¸ßµÄ³¬¹ý 19.2 Kbit/s µÄͨѶËÙ¶ÈµÄ modem¡£ ÕâÊÇÒ»¸öÆô¶¯ 57.6 Kbit/s µÄ gettytab ¼Ç¼µÄÀý×Ó£º

#
# Additions for a V.32bis or V.34 Modem
# Starting at 57.6 Kbps
#
vm|VH300|Very High Speed Modem at 300,8-bit:\
        :nx=VH57600:tc=std.300:
vn|VH1200|Very High Speed Modem at 1200,8-bit:\
        :nx=VH300:tc=std.1200:
vo|VH2400|Very High Speed Modem at 2400,8-bit:\
        :nx=VH1200:tc=std.2400:
vp|VH9600|Very High Speed Modem at 9600,8-bit:\
        :nx=VH2400:tc=std.9600:
vq|VH57600|Very High Speed Modem at 57600,8-bit:\
        :nx=VH9600:tc=std.57600:

¡¡¡¡Èç¹ûÄúµÄ CPU ËٶȽϵͣ¬ »òϵͳµÄ¸ººÉºÜÖØ£¬ ¶øÇÒûÓÐ 16550A µÄ´®¿Ú£¬Äú¿ÉÄÜ»áÔÚ57.6 Kbit/s Éϵõ½ ¡°sio¡± ¡°silo¡±´íÎó¡£

26.4.4.2 /etc/ttys

¡¡¡¡/etc/ttysÎļþµÄÅäÖÃÔÚ Àý 26-1ÖнéÉܹý¡£ ÅäÖà modem ÊÇÏàËÆµÄ£¬ µ«ÎÒÃDZØÐëÖ¸¶¨Ò»¸ö²»Í¬µÄÖÕ¶ËÀàÐÍ¡£ Ëø¶¨ËÙ¶ÈºÍÆ¥ÅäËÙ¶ÈÅäÖõÄͨÓøñʽÊÇ£º

ttyu0   "/usr/libexec/getty xxx"   dialup on

¡¡¡¡ÉÏÃæµÄµÚÒ»ÌõÊÇÕâ¸ö¼Ç¼µÄÉè±¸ÌØ¶¨Îļþ ©¤©¤ ttyu0 ±íʾ /dev/ttyu0 ÊÇÕâ¸ö getty ½«±»¼àÊÓµÄÎļþ¡£ µÚ¶þÌõ "/usr/libexec/getty xxx" Êǽ«ÔËÐÐÔÚÉ豸ÉϵĽø³Ì init¡£ µÚÈýÌõ£¬dialup£¬ÊÇĬÈϵÄÖÕ¶ËÀàÐÍ¡£ µÚËĸö²ÎÊý£¬ on£¬ Ö¸³öÁËÏß·ÊǿɲÙ×÷µÄ init¡£ Ò²¿ÉÄÜ»áÓеÚÎå¸ö²ÎÊý£¬ secure£¬ µ«Ëü½«Ö»±»ÓÃ×÷ÓµÓÐÎïÀí°²È«µÄÖÕ¶Ë (ÈçϵͳÖÕ¶Ë)¡£

¡¡¡¡Ä¬ÈϵÄÖÕ¶ËÀàÐÍ¿ÉÄÜÒÀÀµÓÚ±¾µØ²Î¿¼¡£ ²¦ºÅÊÇ´«Í³µÄĬÈÏÖÕ¶ËÀàÐÍ£¬ ÒÔÖÁÓû§¿ÉÒÔ¶¨ÖÆËüÃǵĵǼ½Å±¾À´×¢ÒâÖÕ¶Ëʲôʱºò²¦ºÅ£¬ ºÍ×Ô¶¯µ÷½ÚËüÃǵÄÖÕ¶ËÀàÐÍ¡£ È»¶ø£¬ ×÷Õß·¢ÏÖËüºÜÈÝÒ×ÔÚËüµÄÕ¾µãÉÏÖ¸¶¨ vt102 ×÷ΪĬÈϵÄÖÕ¶ËÀàÐÍ£¬ ÒòΪÓû§¸Õ²ÅÔÚËüÃǵÄÔ¶³ÌϵͳÉÏʹÓõÄÊÇVT102Ä£ÄâÆ÷¡£

¡¡¡¡Äú¶Ô/etc/ttys×÷ÐÞ¸ÄÖ®ºó£¬Äú¿ÉÒÔ·¢ËÍ init ½ø³Ì¸øÒ»¸ö HUP ÐźÅÀ´ÖضÁÎļþ¡£Äú¿ÉÒÔʹÓÃÏÂÃæµÄÃüÁîÀ´·¢ËÍÐźţº

# kill -HUP 1
Èç¹ûÕâÊÇÄúµÄµÚÒ»´ÎÉèÖÃϵͳ£¬ Äú¿ÉÄÜÒªÔÚ·¢ÐźŠinit ֮ǰµÈһϣ¬ µÈµ½ÄúµÄ modem ÕýÈ·µØÅäÖò¢Á¬½ÓºÃ¡£

26.4.4.2.1 Ëø¶¨ËٶȵÄÅäÖÃ

¡¡¡¡¶ÔÓÚÒ»¸öËø¶¨ËٶȵÄÅäÖã¬ÄúµÄ ttys ¼Ç¼±ØÐëÓÐÒ»¸öΪ getty Ìṩ¹Ì¶¨ËٶȵļǼ¡£ ¶ÔÓÚÒ»¸öËٶȱ»Ëø¶¨ÔÚ 19.2kbit/s µÄ modem£¬ ttys ¼Ç¼ÊÇÕâÑùµÄ£º

ttyu0   "/usr/libexec/getty std.19200"   dialup on

¡¡¡¡Èç¹ûÄúµÄ modem ±»Ëø¶¨ÔÚÒ»¸ö²»Í¬µÄÊý¾ÝËÙ¶È£¬ Ϊ std.speed ʹÓÃÊʵ±µÄËÙ¶ÈÀ´´úÌæ std.19200¡£ È·ÐÅÄúʹÓÃÁËÒ»¸öÔÚ /etc/gettytab ÖÐÁгöµÄÕýÈ·µÄÀàÐÍ¡£

26.4.4.2.2 Æ¥ÅäËٶȵÄÉèÖÃ

¡¡¡¡ÔÚÒ»¸öÆ¥ÅäËٶȵÄÉèÖÃÖУ¬ÄúµÄ ttys ¼ÐèÒª²Î¿¼ÔÚ /etc/gettytab Êʵ±µÄÆðʼ ¡°auto-baud¡± ¼Ç¼¡£ ÀýÈ磬 Èç¹ûÄúΪһ¸öÒÔ 19.2 Kbit/s ¿ªÊ¼µÄ¿ÉÆ¥ÅäËÙ¶ÈµÄ modem Ìí¼ÓÉÏÃæ½¨ÒéµÄ¼Ç¼£¬ ÄúµÄ ttys ¼Ç¼¿ÉÄÜÊÇÕâÑùµÄ£º

ttyu0   "/usr/libexec/getty V19200"   dialup on

26.4.4.3 /etc/rc.d/serial

¡¡¡¡¸ßËÙµ÷ÖÆ½âµ÷Æ÷£¬ ÈçʹÓà V.32¡¢ V.32bis£¬ ÒÔ¼° V.34 µÄÄÇЩ£¬ ÐèҪʹÓÃÓ²¼þ (RTS/CTS) Á÷¿ØÖÆ¡£ Äú¿ÉÒÔÔÚ /etc/rc.d/serial ÖÐÔö¼Ó stty ÃüÁîÀ´ÔÚ FreeBSD ÄÚºËÖУ¬ Ϊµ÷ÖÆ½âµ÷Æ÷ÉèÖÃÓ²¼þÁ÷¿ØÖƱêÖ¾¡£

¡¡¡¡ÀýÈ磬 ÔÚ 1 ºÅ´®¿Ú (COM2) ²¦ÈëºÍ²¦³öÉ豸ÉÏÅäÖà termios ±êÖ¾ crtscts£¬ ¿ÉÒÔͨ¹ýÔÚ /etc/rc.d/serial Ôö¼ÓÏÂÃæµÄÉèÖÃÀ´ÊµÏÖ£º

# Serial port initial configuration
stty -f /dev/ttyu1.init crtscts
stty -f /dev/cuau1.init crtscts

26.4.5 Modem ÉèÖÃ

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