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Using remote access port for connecting serial devices

 
Natesan_1
Frequent Advisor

Using remote access port for connecting serial devices

Configuration:
=============
RP3440 Server with HPUx 11.11

Reuirement:
===========

Customer wanted to configure the Remote access port for connecting Serial device.Can any one test this option so far?.Thank for reply in Advance
INVENT
15 REPLIES 15
Ranjith_5
Honored Contributor

Re: Using remote access port for connecting serial devices

Hi Natesan,

Are you trying to configure a modem for remote access? In that case the thread given below may help you. Look at the answer from Trevor Roddam.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=105146

Regards,
Syam
Natesan_1
Frequent Advisor

Re: Using remote access port for connecting serial devices

Hi Syam,

I want to connect serial device not modem.I want configure a serial port device file for remote access port and connect the device.

I got one ITRC document which talks about only creating modem devices.

Can we allow to configure serial terminal devices.



INVENT
Sยภเl Kย๓คг
Respected Contributor

Re: Using remote access port for connecting serial devices

Hi,

Yes many peoples are using this functionality. Especially remote support team of HP, they normally connects to the MP through a serial modem for remote diagonosis. As this is required by your customer, connecting to the normal serial port is enough.
You can very well connect a modem to one of the serial port and configure the system for a 'dial in'. I would prefer a standard HP modem for this purpose

Regards,
Sunil
Your imagination is the preview of your life's coming attractions
Ranjith_5
Honored Contributor

Re: Using remote access port for connecting serial devices

Hi Natesan,

Hewlett Packard PCI Multiplexer is a high-speed serial communications multiple port product available in two flavors J3592A/A6748A (8-port Mux) and J3593A/A6749A (64-Port Mux). Along with several different modular components, these cards provide multiple serial ports which can be configured in a variety of combinations, to satisfy most applications.

Models are:

PCI 64-port Terminal Multiplexer A6749A
PCI 8-port Terminal Multiplexer A6748A

Hope this info would help you.


Also See the Server Specs for rp3440
here. You can find the type of cards supported for serial terminal devices here.

http://h18000.www1.hp.com/products/quickspecs/12035_div/12035_div.HTML

All the available features are given in this document.

Regards,
Syam
Natesan_1
Frequent Advisor

Re: Using remote access port for connecting serial devices

Hi Sunil,

I want to connect the serial device (like terminal) not modem. How to create deivcefile for remote access port and use that device file for access serial terminal devices?.. (I don't want use modem)
INVENT
Ranjith_5
Honored Contributor

Re: Using remote access port for connecting serial devices

Hi Natesan,

See the online doc below on configuring HP-UX Peripherals.

http://docs.hp.com/en/B2355-90053/ch03.html

HTH

Regards,
Syam
Sยภเl Kย๓คг
Respected Contributor

Re: Using remote access port for connecting serial devices

Hi,

Are u going to use the serial port of the server or with some kind of Terminal servers.


I would recommend you to go step by step throgh this doc, "http://docs.hp.com/en/B2355-90698/ch04.html". Since your exact requirement is not totally described, this doc will defenitely going to help you.

Regards,
Sunil
Your imagination is the preview of your life's coming attractions
Sยภเl Kย๓คг
Respected Contributor

Re: Using remote access port for connecting serial devices

Oh Sorry,
I didn't really seen that shyam has already refered the same, doc.

This is a good one, follow that, if u have any queries u can mail me on 'sunilkumar.vs@sify.com'

Regards,
Sunil
Your imagination is the preview of your life's coming attractions
Ranjith_5
Honored Contributor

Re: Using remote access port for connecting serial devices

Hi Natesan,

As I posted last time there are supported MUX cards available for rp3440 which will help you to setup the required terminal devices. I havent tried using an MDP panel with rp3440 as dumb terminals are very rarely used in today's world as PC prices are very less now a days and dumb terminals can be replaced with good terminal emulation softwares which are freely available.


You may also ask your friends Sunil.K.U / Monahasundaram @Emitac.. I believe, they will be able to help you better than any one... :-)

Regards,
Syam
Natesan_1
Frequent Advisor

Re: Using remote access port for connecting serial devices

Sunil / Syam,

Thanks for your reply.

I Hope you don't understand my question.Please stop replying unwanted information repeatedly.

INVENT
Sameer_Nirmal
Honored Contributor

Re: Using remote access port for connecting serial devices

Hi,

If I understand your question correctly, the customer wants to use the Remote/Modem port at the back of the server for using a serial terminal.

Well , it is not possible to use a Serial terminal ( pins 2,3 and 7 or 5 i.e. without any handshaking ) directly with this port because this port specifically programmed to use with an external modem. The reason is the way the firmware is programmed which check the status of status signals ( DCD , CTS etc ) and controls signals ( DTR , RTS etc). If you attach a modem there and set appropriatly , you can dial-in and get a OS session if selected mode is " OS session". Of course , you need to do configuration in OS for get the session. If the mode is " Management" then access to this port is available from MP only.

Well I haven't try this ever , the trick involved could be using a Null modem cable with various handshaking techniques for DTE/DTE communication. But again we are not aware how the firmware is programmed and how it works. Maybe one of the handshaking technique would work.
But I would advise to contact HP support center and get the correct supported technique. If it works then you can create a device file in OS OE and get an OS session on that port similar procedure as if modem is connected on that port.
Natesan_1
Frequent Advisor

Re: Using remote access port for connecting serial devices

Hi Sameer,

Your understanding is correct.Device which we would like to connect maynot be terminal, it is serial com device.First we would like to test by configuring device file.

I will try to use device file /dev/tty1t4 for accessing remote access port and enabling SE on remote access. I will seek, HP assistance in case of problem.

Thanks for your prompt information.
INVENT
Natesan_1
Frequent Advisor

Re: Using remote access port for connecting serial devices

The device file /dev/tty1p4
INVENT
Sameer_Nirmal
Honored Contributor

Re: Using remote access port for connecting serial devices

Hi Natesan,

You are trying to use the local sesion port /dev/tty1p4 for estabilishing an OS local session ( note: it is not a console session )
I guess you can only use it if you are directly connected to Local or Remote Console ports i.e MP -> SE
As you are trying to use the Remote port, you have to have a serial device connected to that port which will give you console access first( console session ). Then you can go to MP and use SE command to use the OS session created with the device file.

The device file for the Remote/Modem port is /dev/tty1p2 which gives you Remote Console access once you dial-in.

Stefan Stechemesser
Honored Contributor

Re: Using remote access port for connecting serial devices

Hi Natesan,

although HP does not support it, it should work when the modem port is configured to "OS session".
I just successfully configured our rp3440 running HPUX 11.23 (MP firmware 3.15) to show a logon prompt on a remote terminal connected to the remote modem port (9600 baud, 8 bits, no stop bit) by using the default device file /dev/tty1p2 and inserting the following line in /etc/inittab

t1p2:234:respawn:/usr/sbin/getty -h tty1p2 console 9600

then "init q" to make the changes active.
You can also use /dev/tty1p2 for outgoing serial traffic to your device.
To set or view the serial line settings (if you are not using getty) use

stty -a < /dev/tty1p2
and of cause: "man stty"
also interesting:
"man mksf" (then search for the options for asio driver)
"man modem" (for deeper info on modem control lines)


Unfortunately, there is a little bug in the firmware: After a reboot, the Remote Modemport always falls back to "GSP mode" (but still OS session will be displayed) if it was in OS session mode before.
=> you have to manually lock and reenable OS session mode after each reboot.
This bug will be fixed in future versions of the MP firmware.

By the way, the devicefile for the UPS port is /dev/tty0p0. I tested to set up a getty on this port too, and I got a login prompt. Unfortunately another application or the MP also wrote garbage to that port when I logged in and I could not investigate the source of that problem. Maybe you have more luck ...

best regards

Stefan