topic Re: connecting external modem in Operating System - HP-UX

connecting external modem

TMcB — Mon, 28 Jan 2002 10:54:52 GMT

Hi folks,

I have a US Robotics external modem that isn't working.
The server is an HP9000 K370, and I'm trying to connect it to the 25pin port labelled "external modem".

I have gone through all the other forum calls and HP manuals on modems and still cannot get it to work.

When the modem is diconnected, the TR light is off - when I connect it to the port the TR light still stays off.
On checking it with another HP 9000 on which I know it works, when the cable is connected the TR light come ons.

Any help is much appreciated

T McB

Re: connecting external modem

Stefan Farrelly — Mon, 28 Jan 2002 11:00:32 GMT

Are you sure the US robotics modems are supported on HP's ? I dont think they are. We experimented with some here but had so many problems (mainly unreliability), and we found out they are not supported by HP so no help from the response centre, that we ditched them and went back to the old Multitech II's modems that are nice and reliable.

Funny thing, EMC tried to use new Robotics on their EMC frames here for dialing out and had the same problem! so theyve gone back to the tried and tested, and reliable, Multitech II's too.

Re: connecting external modem

TMcB — Mon, 28 Jan 2002 11:04:43 GMT

The modem works correctly on another HP 9000 server which we have.

Re: connecting external modem

Alexander M. Ermes — Mon, 28 Jan 2002 11:07:09 GMT

Hi there.
Try this part from a HP document :

Configuring US Robotics Sportster 14.4 and 28.8 modems on HP-UX

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Score : 0
Document Type : EN
Date : 2000 Aug 07
Description : Configuring US Robotics Sportster 14.4 and 28.8 modems on HP-UX
Document Id : KBRC00003480
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--------------------------------------------------------------------------------
Configuring US Robotics Sportster 14.4 and 28.8 modems on HP-UX DocId: KBRC00003480 Updated: 8/25/00 10:59:00 AM

PROBLEM
How can I configure my US Robotics Sportster modem for use on a HP-UX system?

RESOLUTION
**NOTE** These register settings have *NOT* been tested by the Hewlett
Packard Response Center and are *NOT* gauranteed to work.
For specific modem support, please contact the modem manufactuer.

Since 28,800 baud is not a valid port speed, it is recommended that
the customer first set the modem up as a 19,200 baud or slower
speed to establish functionality.

DIP SWITCH SETTINGS:

Top of Modem

-------------------------------
| X | X | | X | X | X | X | | (up = off)
| | | X | | | | | X | (down = on)
-------------------------------
1 2 3 4 5 6 7 8

Switch # Function

1 = off Normal DTR operations
2 = off Verbal result codes
3 = on Result codes display enabled
4 = off Keyboard commands displayed
5 = off Auto answer controled by non-volatile memory settings.
6 = off Normal CD operations
7 = off Power on & ATZ reset to non-volatile memory settings (not
factory defaults)
8 = on AT Command set recognition (Smart Mode)

Register Settings From "ATI4 & ATI5" commands:

&F = Return to factory default configuration
E1 = Modem displays keyboard commands
M1 = Speaker on until connect
Q0 = Display results codes
V1 = Verbal Codes
X1 = Result code (default)
*&B0 = Modems Serial Port rate is variable, follows connection speed
&C1 = Normal carrier detect operations
&D2 = Normal DTR operations
*&H0 = Flow control disabled
*&I0 = Flow control disabled
*&K0 = Data Compression disabled
*&M0 = No ARQ
&R1 = Modems ignores RTS
S0=1= Auto answer on first ring.

*NOTE: Settings that enable flow control, and data compression can be changed
after successful operation of the modem is established. At the outset,
it is advisable to disable data compression and flow control. For
further information on Modem configuration, please consult your owner's
manual or the modem manufacturer.

NOTE: Software flow control should *NOT* be used if you use or contemplate
using UUCP as it will interfere with UUCP operation. Hardware flow
control is supported only on certain HP-UX interfaces and requires a
special device file setup.

Rgds
Alexanderm M. Ermes.
BTW
MultiTech modems are really much more reliable

Re: connecting external modem

TMcB — Mon, 28 Jan 2002 11:18:57 GMT

Does anyone know the pin setup for the cables so I can check that as well

Thanks

Re: connecting external modem

Wayne Yu_1 — Fri, 11 Oct 2002 21:00:03 GMT

Here is the cables pin out:

********************************************************************
CABLE PINOUT
********************************************************************

24542M
9000/345 & 9000/375 Serial Modem cable
9000/700 Serial Modem cable
(for use on the internal 9 pin serial port)

Note: This cable is a standard IBM AT style 9 <-> 25
modem cable.

This cable will not work on 98644 style interfaces
used on earlier 9000/300 machines. They need the
92221M cable, or the supplied adapter.

The lines marked with * are usually the ones
needed for modem use.

CPU Modem
( DB-9 F DTE ) (DB-25 M DCE)
-------------------------------------------
CD 1 <--------- 8 CD *
RD 2 <--------- 3 RD *
TD 3 ---------> 2 TD *
DTR 4 ---------> 20 DTR *
GND 5 <--------> 7 GND *
DSR 6 ---------- 6 DSR
RTS 7 ---------- 4 RTS
CTS 8 ---------- 5 CTS
RI 9 <--------- 22 RI

40233A
9000/800 Series Modem cable

CPU Modem
-------------------------------------------
Gnd 1 ---------- 1 Gnd
RD 2 <--------- 3 TD
TD 3 ---------> 2 RD
RTS 4 <--------- 8 DCD
DSR 6 ---------> 20 DTR
GND 7 <--------> 7 GND
DCD 8 ---------> 4 RTS
9 <--------- 22 RI
DTR 20 <--------- 6 DSR
RI 22 <--------- 5 CTS

**************************************************************************
Using high speed
***************************************************************************

1. To use high speed it is advisable to use device files with hardware flow control. These can be made via
the mksf command:
A. mksf -H (hardware path) -d asio0 -a 2 -f (dialin device name)
B. mksf -H (hardware path) -d asio0 -a 1 -f (dialout device name)

2. The "AT String " from above must be used to initialize the modem.

3. The key point is fixing port speed to the getty speed which should be above the modem's maximum connect
speed. To do this you must connect to the modem at the higher speed and then fix the port speed. With a US
Robotics modem this is &B1. Other modems may vary depending on the manufacturer.

4. Once the port speed is fixed to the getty speed it should connect at the highest speed of which the
modem is capable of transferring data.

Re: connecting external modem

Darren Prior — Mon, 14 Oct 2002 09:55:10 GMT

Hi Terry,

You haven't mentioned what model your other HP9000 is, which could make a difference.

The port you have connected to on the K370 is generally used if you wish to have an external modem for Predict usage. To use this port you will need to disable remote console usage as well as switching from the internal modem to external.

A better solution is to connect the modem to an external mux.

There are issues with cabling for US Robotics modems (I believe it is related to their handling of some of the handshaking lines) so you may need to construct your own cable.

regards,

Darren.

Re: connecting external modem

MANOJ SRIVASTAVA — Mon, 14 Oct 2002 12:33:37 GMT

Hi Terrry

Essentially the TR on implies that the Mdoem is tranmitting something , or the com port on which you ahve connected is tramsiiting some signal . Is the port set to respawn etc ?

You may like to look at the following :
Get a login prompt on the modem :-

/etc/inittab
------------

a0:3:respawn:/usr/lbin/uucp/uugetty -r -t 60 -h ttyd1p0 57600

Define the getty :-

/etc/gettydefs
--------------

57600 # B57600 HUPCL IGNPAR PARENB ICRNL IXON OPOST ONLCR CS7 CREAD
ISIG ICANON ECHO ECHOK PARENB ISTRIP IXANY TAB3
# B57600 SANE CS7 PARENB ISTRIP IXANY TAB3 HUPCL
#login: #57600

Allow dial out using cu -l cul1p0 -m dir

/etc/uucp/Devices
-----------------

Direct cul1p0 - 57600 direct

Note: cul1p0 is my device. Yours will probably be different.

These are the enteries :

/etc/inittab
------------

a0:3:respawn:/usr/lbin/uucp/uugetty -r -t 60 -h ttyd1p0 57600

/etc/gettydefs
--------------

57600 # B57600 HUPCL IGNPAR PARENB ICRNL IXON OPOST ONLCR CS7 CREAD
ISIG ICANON ECHO ECHOK PARENB ISTRIP IXANY TAB3
# B57600 SANE CS7 PARENB ISTRIP IXANY TAB3 HUPCL
#login: #57600

/etc/uucp/Devices
-----------------

Direct cul1p0 - 57600 direct

Also if you can cu to the modem may be you can try resetting the settings using

connect

AT&F0 to reset the settign to factory

Manoj Srivastava