US Robotics 14.4 External Modem

[Richard R. Socash]

Help !!!

I have two U.S. Robotics external 14.4 Sportster modems.
I am trying to connect them to a microVAX 3600 system
for our dial-up lines. I need help with the modem settings.

The VAX ports are set at variable speed (autobaud), ranging
from 1200 to 9600 baud, modem, and dial-up. In the past,
I have found it necessary to turn off all compression
and error detection for the high speed modems to
work correctly on the VAX.

I have set the following, but to no avail.

The first setup was:

&A0, &B0, &K0, &M0, S00=1, and dip switch 5
set to off.

Result: I was able to connect to the VAX,
using the same model of modem to dial-up
from my PC, but the modem would only connect
at 1200 baud.

The second setup was:

&M0, S00=1 and dip switch 5 set to off

Result: I was not able to connect to the VAX.

I would appreciate any suggestions you may have to get these
modems configured for the dial-up lines.

Thank you,

Leslie A. Mathis
TENTIME email tt...@tentime.com
7000 N. Broadway
Suite 215
Denver, Colorado 80221

[kpe...@entergy.com]

This may help...I have my MODEMs connected to a DECServer 90M, not a
MicroVAX. I had to fight with the settings quite a bit and have
settled on these. I have included the DECServer port settings also.

One thing to point out. I found that I had to set DIP switch 3 OFF to
keep the "RING" message from inadvertently establishing the baud rate
before I was connected. This was only a problem with the Sportster.
I do have error correction enabled, so I would suggest you try your
first settings attempt again with SW3 OFF before trying what I use.

If anyone needs similar settings for a U.S. Robotics Courrier V.32bis
modem, I have those also...let me know.

The settings are:

DECServer 90M port characteristics...

Port 6: EXT5414 Server: LAT_08002BB2D6B6
Character Size: 8 Input Speed: 9600
Flow Control: XON Output Speed: 9600
Parity: None Signal Control: Disabled
Stop Bits: Dynamic

Access: Dynamic Local Switch: None
Backwards Switch: None Name: EXT5414
Break: Local Session Limit: 4
Forwards Switch: None Type: Ansi
Default Protocol: LAT Default Menu: None

Preferred Service: None

Authorized Groups: 0
(Current) Groups: 0

Enabled Characteristics:
Autobaud, Autoprompt, Broadcast, Dialup, Input Flow Control,
Loss Notification, Message Codes, Output Flow Control, Verification





USRobotics Sportster 14400 Fax Settings...

B0 E1 F1 M1 Q1 V1 X4 Y0
BAUD=9600 PARITY=N WORDLEN=8
DIAL=PULSE ON HOOK

&A3 &B0 &C1 &D2 &G0 &H2 &I2 &K1
&M4 &N0 &P0 &R1 &S0 &T5 &Y1

S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002
S07=120 S08=002 S09=006 S10=030 S11=070 S12=050 S13=000
S14=000 S15=000 S16=000 S17=000 S18=000 S19=000 S20=000
S21=010 S22=017 S23=019 S24=000 S25=005 S26=000 S27=000
S28=008 S29=020 S30=000 S31=000 S32=000 S33=000 S34=006
S35=000 S36=014 S37=000 S38=000 S44=015 S51=000

LAST DIALED #:



USRobotics Sportster 14400 Fax DIP Switch Settings...

SW1 - OFF - Normal DTR
SW2 - OFF - Verbal results
SW3 - OFF - Supress result codes
SW4 - OFF - Echo offline commands
SW5 - OFF - Enable auto-answer
SW6 - OFF - Normal carrier detect (CD)
SW7 - OFF - Load configuration from NVRAM
SW8 - ON - Enable recognition (smart mode)


Regards,

K. Perry
Entergy - Transmission System Operations
Pine Bluff, AR USA
kpe...@entergy.com

"I do not fear computers. I fear the lack of them."
- Issac Asimov

______________________________ Reply Separator _________________________________
Subject: US Robotics 14.4 External Modem
Author: tt...@csn.net (Richard R. Socash) at ~~CC3-LA-EC-SMTP-LINK
Date: 3/12/96 11:24

[John Nebel]

On 12 Mar 1996, it was written:

> Help !!!
>
> I have two U.S. Robotics external 14.4 Sportster modems.
> I am trying to connect them to a microVAX 3600 system
> for our dial-up lines. I need help with the modem settings.
>
> The VAX ports are set at variable speed (autobaud), ranging
> from 1200 to 9600 baud, modem, and dial-up. In the past,
> I have found it necessary to turn off all compression
> and error detection for the high speed modems to
> work correctly on the VAX.
>

cut
>
> Leslie A. Mathis

Leslie,

I've never used USR at the local end, but several other brands and
the situation should be similar.

No autobaud - fix the VAX port and the modem at a the highest speed you
intend to use - 19.2kb is a reasonable choice for 14.4 with compression.
Let the modem adjust the speed. Read the modem manual sections on flow
control carefully - if your VAX comm device supports it, use cts/rts.

Set the modem so it operates in "dumb" mode - nothing but data out its
serial port.

If possible, use a terminal server.

John Nebel