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Grex > Hardware > #52: Penril Data Comm Cadet 2400 modem command set sought. | |
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| Author |
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n8nxf
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Penril Data Comm Cadet 2400 modem command set sought.
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Jun 21 12:10 UTC 1993 |
I have a Pinril Data Comm. Cadet 2400 modem I got cheap. I seems to be
in working order, however I don't have a manual for it and it does not
seem to respond to the "AT" commmand set. Anyone know what the command
set is for this modem? The DIP switch for Command Recognition is enabled.
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| 19 responses total. |
tsty
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response 1 of 19:
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Jun 21 15:46 UTC 1993 |
Ummm, maybe try setting the Command Recognitoin switch in the other
position ??? It might not agree with your interpretation of "is enabled?"
Also, do the TD / RD lights blink at you when you try to issue
commands? They should...
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n8nxf
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response 2 of 19:
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Jun 21 16:56 UTC 1993 |
The switch is definatly set to enable Command Recognition. The logo is
very clear on setting the switches (a rarity).
Both TD and RD lights flash when I try to talk to it and the modem will
go off-hook and send a carrier/bit stream when playing with a Data/Talk
switch on the front bezel. I wonder if Penril Data Comm. is still around?
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davel
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response 3 of 19:
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Jun 22 01:36 UTC 1993 |
A wild idea: do you have access (does anyone) to a comm pgm with built-in
support for this modem? You might hook it up, either with a loop or to
another machine, & see what comes out when the program tries to tell
the modem what to do.
I suspect you wouldn't be asking if your comm pgm met this requirement.
Sigh.
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rcurl
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response 4 of 19:
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Jun 22 05:24 UTC 1993 |
Have you tried any other protocols? Such as the Tandy commands?
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n8nxf
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response 5 of 19:
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Jun 22 11:32 UTC 1993 |
No on both the above. I am using Telix and I have no idea what the
Tandy commands are. All the modems I've ever used are Hayse compatable
or dumb acoustic coupled units.
I called a phone No. printed on the bottom of the unit but that was no
loner in service. There is an EPROM inside with the date of 1984 stamped
on it. Maybe I'll have to pull it out and read the contents with an
EPROM programer. There might be some clues inside???
Give me some of the Tandy commands rcurl and I'll give them a whrill.
I'll also try to post this question on a Fido Net conferance. Maybe
I'll have better luck there due to the larger audience.
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rcurl
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response 6 of 19:
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Jun 22 14:44 UTC 1993 |
First, on the Tandy DCM 212, for Command Recognition, DIP switch 7
is OFF (up).
The Wake Up command is [*][.] (without the parentheses). It echos [*].
The dialer command is [D].
Mode parameters may have to be entered. After [*][.], type [L] to
list current parameters (echo is *L). Key MANUAL MODE: to N and
ORIG MODE: to Y (with M and/or O).
When in command mode, one dials with (for example)
DT 761 3000 X
(If any of this works - I have the manual for Tandy Protocol, and you are
welcome to borrow it.)
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n8nxf
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response 7 of 19:
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Jun 22 17:30 UTC 1993 |
Well rcurl, I tried the Tandy commands, but n
o
WOW mongo line noise.
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n8nxf
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response 8 of 19:
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Jun 22 17:41 UTC 1993 |
It doesn't show but I was getting a lot of line noise in the responce
above. I was using the Penril modem...it seems to have a problem with
less than perfect lines too. No go rcurl. Tandy commands don't work
either. I was using the modem in dumb mode, having dialed grex from
an extension, so it does work to some degree.
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davel
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response 9 of 19:
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Jun 22 20:22 UTC 1993 |
You could make it *connect* that way? Wow.
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n8nxf
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response 10 of 19:
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Jun 22 23:45 UTC 1993 |
Yea, it has a Talk/Data switch. With the switch in the Talk pos., I
make the call and when the host modem answers I switch to Data. That's
it, it takes care of the rest (Including all the line noise! ;-)
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davel
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response 11 of 19:
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Jun 23 00:41 UTC 1993 |
Again I say "wow". My modem has been getting flaky about hanging up &
dialing. (It will stay off-hook even when I power everything down, for
example.) I wish it worked like that.
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n8nxf
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response 12 of 19:
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Jun 23 11:02 UTC 1993 |
Sounds like the reed relay inside is sticking. This relay is used to
dial pulse and connect/disconnect from the line. If you can figure
out what voltage it takes to drive the coil around the reed, you can
replace it. Radio shack sells 5 and 12 volt reed relays for under
$2.00 that could be "hacked" in.
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davel
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response 13 of 19:
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Jun 23 11:11 UTC 1993 |
Only by someone more adept than I am at recognizing components, soldering,
unsoldering, etc. If I tried something like that I would have no modem at
all in very short order.
But what you say indeed describes very much what it *sounds* like,
especially when it mis-dials. (And, yes, we are talking pulse dialing
here.) Thank you *very* much for the hint.
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n8nxf
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response 14 of 19:
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Jun 23 19:58 UTC 1993 |
Well all, I found my problem. Silly me. It does respond to the AT command
set. It does
not respond to the at command set though. This thing is case sensitive!
Thanks all for your help!
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davel
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response 15 of 19:
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Jun 23 21:59 UTC 1993 |
<red face> Klaus, I'm sorry - I almost mentioned it, but since you kept
typing uppercase when you said AT command set I thought you *must* have
tried that. I believe the first Hayes modem (real Hayes) I ever used
was case-sensitive.
Oops. Glad you got it anyway!
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n8nxf
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response 16 of 19:
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Jun 24 11:18 UTC 1993 |
Ha, yea, I did type upper case didn't. Live and learn ;-)
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n8nxf
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response 17 of 19:
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Jun 24 12:03 UTC 1993 |
I replaced the MOV (spike killer) and several capacitors inside the
Penril modem and so for, no noise? (Wouuldn't you know, right in
the middle of the word noise I got two "{"!) My good friend
Mur
phy!
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remmers
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response 18 of 19:
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Jun 24 15:46 UTC 1993 |
Side question: Is case-insensitivity part of some official standard,
or is it just something that most modems now do? My first semi-Hayes-
compatible (a U.S. Robitics Password 1200 baud) was case sensitive,
requiring all commands to be in upper case. My new modem, acquired a
couple of weeks ago, seems to be completely case-insensitive, accepting
"AT", "at", "At", and "aT" for the command prefix. This is very easy
to implement of course, as it just involves masking one bit of the
ascii code.
But I've seen at least one modem that would accept either upper or lower
case commands, but required the command prefix to typed in a single
case. It liked "AT" and "at", but didn't recognize "At" or "aT" as
starting a command.
So I'm curious if there are any official standards in this area that
a completely Hayes-compatible modem is supposed to adhere to.
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mju
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response 19 of 19:
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Jun 24 23:14 UTC 1993 |
Not really, since "Hayes-compatible" is more or less nonexistant now
with all of the extended command sets. The problem is that Hayes wasn't
the first to come out with, say, an MNP or V.42 modem, so they didn't
get to set the standard. Microcom chose an abysmal standard (the backslash
as a prefix character), so lots of companies have gone with % or just
more S-registers. ZyXEL and Digicom use * as well. The only things
that are really standard are the first ten or so S-registers and the
basic AT and AT& commands.
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