Hello Michael!

Friday October 25 1996 14:34, Michael Raiteri wrote to all:

 > Can anyone tell me if there is a way to force a Rockwell based
 > modem to connect at a certain speed eg 24000 or 26400.

 > I know that ATN0S37=11 will force a 14400 connect but that seems
 > to be the highest forced connect rate I can find anywhere in the
 > manual.

Well, if you have a V.FC, you start using ATFx commands, or high S37
values. I've included a table of them below. If you have a V.34, you can
use AT+MS.

(These tables are from the Supra V.FC and V.34 command listings respectively.)

         F0     AutoMode Selection (Same as N1)
         F1     300 bps only (Same as N0S37=1,uses protocol in Bn setting
                        S31 bit 1 set to 0 and S37=1)
         F2     Undefined
         F3     v.23 only 75TX/1200RX (originate) or 1200TX/75RX (answer)
                        (Same as N0S37=7, S31 bit 1 set to 0 and S37=1)
         F4     1200 bps only (protocol according to Bn setting)
                        (Same as N0S37=5, S31 bit 1 set to 0 and S37=5)
         F5     2400 bps only (v.22bis)
                        (Same as N0S37=6, S31 bit 1 set to 0 and S37=6)
         F6     4800 bps only (v.32/v.32bis)
                        (Same as N0S37=8, S31 bit 1 set to 0 and S37=8)
         F7     7200 bps only (v.32bis)
                        (Same as N0S37=12, S31 bit 1 set to 0 and S37=12)
         F8     9600 bps only (v.32/v.32bis)
                        (Same as N0S37=9, S31 bit 1 set to 0 and S37=9)
         F9     12000 bps only (v.32bis)
                        (Same as N0S37=10, S31 bit 1 set to 0 and S37=10)
         F10    14400 bps only (v.32bis)
                        (Same as N0S37=11, S31 bit 1 set to 0 and S37=11)
         F11    Undefined
         F12    Undefined
         F13    14400 bps only (v.FC)
                        (Same as N0S37=15, S31 bit 1 set to 0 and S37=15)
         F14    16800 bps only (v.FC)
                        (Same as N0S37=16, S31 bit 1 set to 0 and S37=16)
         F15    19200 bps only (v.FC)
                        (Same as N0S37=17, S31 bit 1 set to 0 and S37=17)
         F16    21600 bps only (v.FC)
                        (Same as N0S37=18, S31 bit 1 set to 0 and S37=18)
         F17    24000 bps only (v.FC)
                        (Same as N0S37=19, S31 bit 1 set to 0 and S37=19)
         F18    26400 bps only (v.FC)
                        (Same as N0S37=20, S31 bit 1 set to 0 and S37=20)
         F19    28800 bps only (v.FC)
                        (Same as N0S37=21, S31 bit 1 set to 0 and S37=21)



+MS     Select Modulation
        Configures the modulation(s), and rate(s) currently supported
        +MS?    Returns Current Setting
        +MS=?   Returns Command Range(s)
        +MS=,,, 
                {Any values omitted remain at the current setting}.
        Example: +MS? responds with "RVFC,0,14400,28800" for VFC ONLY mode.
                 To return to "Default" USA mode of full V34,VFC,V32bis,
                 V22bis, Bell 212, and Bell 103 (assuming B1 is set) the
                 user can enter just "+MS=V34,,300, "
however an input
                 of "+MS=V34,1,300,33600 " would give
the same result.

         specifies the PREFERRED modulation as per the list below.
                Note that verbose or numeric  selections can be
                used and VERBOSE settings are reported.

                Protocol   Possible Carrier Rate(s) (bps)
         verb  / Num
        +------+----+----------+---------------------------------------------+
        | V21  | 0  | V.21     | 300                                         |
        +------+----+----------+---------------------------------------------+
        | V22  | 1  | V.22     | 1200                                        |
        +------+----+----------+---------------------------------------------+
        | V22B | 2  | V.22bis  | 2400 or 1200                                |
        +------+----+----------+---------------------------------------------+
        | V23C | 3  | V.23     | 1200 Transmit / 75 Receive (originate mode) |
        |      |    |          | 75 Transmit / 1200 Receive (answering mode) |
        +------+----+----------+---------------------------------------------+
        | V32  | 9  | V.32     | 9600 or 4800                                |
        +------+----+----------+---------------------------------------------+
        | V32B | 10 | V.32bis  | 14400, 12000, 9600, 7200, or 4800           |
        +------+----+----------+---------------------------------------------+
        | V34  | 11 | V.34     | 33600 31200 28800 26400 24000 21600 19200   |
        |      |    |          | 16800 14400 12000 9600 7200 4800 or 2400    |
        +------+----+----------+---------------------------------------------+
        | B103 | 64 | Bell 103 | 300                                         |
        +------+----+----------+---------------------------------------------+
        | B212 | 69 | Bell 212 | 1200                                        |
        +------+----+----------+---------------------------------------------+
        | RVFC | 74 | VFC      | 28800 26400 24000 21600 19200 16800 or 14400|
        +------+----+----------+---------------------------------------------+

         0 (Disable) Limits the modem to the PREFERRED 
                        protocol within the specified 
                        and  range.
                   1 (Enable - Default)  Allows the modem to "fall back"
                        to other protols within the specified 
                        and  range for which standard automode
                        procedures exist using V8 or V32 Annex A.
                        Exampe: Failed V34 connection attempts can automode
                        to VFC or lesser protocols, but a Bell 103 connection
                        attempt cannot automode to V23.

         sets the lowest carrier rate that may be used.
                (Default 300 bps)

         sets the maximum carrier rate that may be used.
                (Default 33600 bps)  Setting a non-zero value in the S37
                command adjusts the +MS rate commands as well.


Your modem may not support the text modulation flag, only the numbers.


Regards,
Hamish

--- GoldED/P32 2.42.G1219+