Connect a US Robotics 56K Modem to a 2400bps TTY Port

[color red]Setting up the US Robotics
56k Modem at 2400bps[/color]

1. Before starting, change dip switches 3 and 8 on the back to the down position.
2. Connect the modem to the PC using a standard modem cable.
3. Start ProComm/Hyperterminal and connect using any speed, 8 data bits, 1 stop bit, no parity and the terminal setting to ANSI BBS.
4. After the connection is established, enter ôATö. The modem should return ôOKö.
5. With the desired settings in hand, enter ôATI4ö to display the current modem settings.
6. To change the settings on the top line of commands, type "AT" immediately followed by the desired setting. For example, to change X4 to X1, enter ôATX1ö.
7. To change the middle set of commands (&xx), enter ôAT&xxö. For example, to change &A3 to &A1, enter ôAT&A1ö. All of the changes can be made on one line by continuing the string, i.e. ôAT&A1&B1&U2ö.
8. To change the S register numbers, enter "ATSr=n" where r equals the resister number and s equals the desired value. For example, to change the value in S002 from 043 to 040, enter ôATS2=40ö.
9. Once the settings are correct, they must be transferred to the NVRAM. The NVRAM holds two tables of data, called Y0 and Y1. These tables are used to set up the modem at power up. Either table can be used, but for consistencyÆs sake, use Y0. The setting that tells the modem where to look at power up is located in the first line at the Yx (see #6) setting. To save the settings in Y0, enter ôAT&W0ö.
10. To verify the settings were saved, enter ôATI5ö. This will display the settings in both the Y0 and Y1 NVRAM tables.
11. One last test, power down and then back up the modem. Enter "ATI4" and the settings should reflect the changes.
12. Turn the modem back off, place dip switches 3 and 8 in the up position and switch 4 down.

[color red]Following are the NVRAM settings for running at 2400bps.[/color]
ATI4
U.S. Robotics 56K FAX EXT Settings...

B0 E1 F1 M1 Q0 V1 X1 Y0
BAUD=2400 PARITY=N WORDLEN=8
DIAL=TONE ON HOOK CID=0

&A1 &B1 &C1 &D2 &G0 &H0 &I0 &K0
&M0 &N3 &P0 &R1 &S0 &T5 &U2 &Y1

S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002
S07=060 S08=002 S09=006 S10=014 S11=070 S12=050 S13=000
S15=000 S16=000 S18=000 S19=000 S21=010 S22=017 S23=019
S25=005 S27=000 S28=008 S29=020 S30=000 S31=128 S32=002
S33=000 S34=000 S35=000 S36=014 S38=000 S39=000 S40=001
S41=000 S42=000

LAST DIALED #:
OK
ATI5
U.S. Robotics 56K FAX EXT NVRAM Settings...

Template Y0

DIAL=TONE B0 F1 M1 X1
BAUD=2400 PARITY=N WORDLEN=8

&A1 &B1 &G0 &H0 &I0 &K0 &M0 &N3
&P0 &R1 &S0 &T5 &U2 &Y1

S00=001 S02=043 S03=013 S04=010 S05=008 S06=002 S07=060
S08=002 S09=006 S10=014 S11=070 S12=050 S13=000 S15=000
S19=000 S21=010 S22=017 S23=019 S25=005 S27=000 S28=008
S29=020 S30=000 S31=128 S32=002 S33=000 S34=000 S35=000
S36=014 S38=000 S39=000 S40=001 S41=000 S42=000