On Fri 03 Jan at 22:40 Andrew Dunstan (3:633/277) wrote to All:

 AD> At the start of last year I got a 2400 Scitec Modem at a 
 AD> sale for $2 and discovered that it was an old "dumb" modem 
 AD> which had to be operated with switches on the front panel as 
 AD> it had no way to recognise AT commands. Then, a few weeks 
 AD> ago I ended up with two more of the buggers, which looked 
 AD> exactly the same, but which seem to be slightly hayes 
 AD> compatible, accepting dialing commands and answering 
 AD> automatically. The front of the modems have "intelligent 
 AD> V.22bis modem" written on them so you'd expect them all to 
 AD> be hayes comp. They each have a bank of 8 switches on the 
 AD> back which seem to do different things among them such as 
 AD> allowing the dtr to be controlled and such.
 AD>  
 AD> Any info on these modems especially about how to make the 
 AD> odd one hayes compatible would help. But don't strain 
 AD> yourselves, who wants a 2400 anyway?

Date:   Mon May 09 1994  05:32:48
From:   johns{at}rd.scitec.com.au
To:     All
Subj:   Scitec Business 2400 modem
Attr:   
aus.comms                      -------------------------------

From: johns{at}rd.scitec.com.au (John Saunders)
Newsgroups: aus.comms
Organization: none
Message-ID: 

Several people have requested info about the SCITEC Business 2400
baud modem. Here are a few snippets of info to get the modem working
assuming that it is in working condition. If you need any more info
then e-mail me direct as I don't want to clutter the newsgroup.

Check internal links/switches
-----------------------------

S8-1 (located about centre of board) should be in the PSTN or
OFF position.

W3 and W4 (located close to the right hand side rear when board
viewed from from) should NOT have links on them.

W6 (centre rear of board) should bne off.

W5 (between S8 and W4) should be off.

Set the DIP switch on the back
------------------------------

S1  S2  S3
On  Off Off		8 bits/char async - 2400 model?
Off Off Off		8 bits/char async - 2400A model
On  On  Off		9 bits/char async
Off Off Off		10 bits/char async - 2400 model?
On  Off Off		10 bits/char async - 2400A model
Off On  Off		11 bits/char async

On  On  On		Slave clock TxC = RxC sync
On  Off On		External TxC (pin 24) sync
Off Off On		Internal TxC (pin 15) sync

S4 - Responses disabled (only revision C software)

  If this switch is turned on then the modem won't
  send back response codes from commands which is
  equivalent to sending ATQ1.

S5 - Echo Disable (only revision C software)

  If this switch is turned on then the modem won't
  echo back what is typed and is equivalent to
  sending ATE0.

S6 - Selection of permanent or controlled DTR

  Factory set to off. Selects if DTR is permanent
  or controlled by the state the modem is in.

S7 - Selection of permanent or controlled RTS

  Factory set to off. Selects if RTS is permanent
  or controlled by the state the modem is in.

S8 - Selection of permanent or controlled DSR

  Factory set to off. Selects if DSR is permanent
  or controlled by the state the modem is in.

Note: To find the software revision use ATI command
and revision C will display 24C.

Note: There is come confusion about the S1-S3 switches for
8 bits/char and 10 bits/char selection. An addendum lists
the settings for the 2400A model but the original manual
has the settings for the 2400? model. You might try either
until it works. The normal setting would be 8 bits/char
for an 8N1 port.

Test it out
-----------

Set the COM port to 2400 baud 8 data bits no parity and
1 stop bit.

Connect the modem and power it if not already in this
state. The DTR, RTS, CTS and 24 LED's should be on.

Type AT and press return while watching the TD and RD
LED's, they should flicker with each keypress. The
modem should respond with OK.

Push the LOOP button once and the TST LED should come
on. Type a message and check that it is echoed back.
Push the LOOP button twice so that the TST LED goes
out.

The modem should now be operational assuming it passed
the above tests.

Note: The modem will autobaud to 1200 or 2400 based on
the terminal setting. The correct LED on the front will
reflect that setting. You need to type AT a few
times to get it to autobaud.

AT command summary (not a complete list)
----------------------------------------

AT - Attention command

A/ - repeat last command

ATA - answer incomming call if not in auto answer mode.

ATB{0,1} - Select CCITT modes (0), select Bell modes (1)

ATD{TP} - Tone dial (T) or pulse dial (P) a telephone
number, a comma ',' in the number produces a 2 second delay.

ATH{0,1} - Hang up call (0) or pick up line (1).

ATI - show software revision.

ATM{0,1,2} - Set speaker to quiet (0), on while dialing (1),
on always (2).

ATO - Return modem online after a '+++' sequence placed the
modem in command mode.

ATZ - Reset modem to power up state.

ATSx[=y] - Set S register x to value y. If = and y are
missing then display S register x.

S7 contains the wait for carrier after dialing time.
It is in seconds and range is 0 - 30.

S8 contains the pause time generated by the comma
in a phone number in seconds, range is 1 - 255.

S10 contains the time between a loss of carrier
and the modem hanging up. The number is in 0.1 second
steps and ranges from 1 - 255.

Hope this helps info helps.
-- 
+------------------------------------------------------------+
|  John Saunders        john{at}odin.apana.org.au  <- at home   |
|  61 2 428 9006        johns{at}rd.scitec.com.au  <- at work   |
+------------------------------------------------------------+

---