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тАО04-02-2008 04:43 AM
тАО04-02-2008 04:43 AM
TCPIP to a DECServer
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тАО04-02-2008 06:11 AM
тАО04-02-2008 06:11 AM
Re: TCPIP to a DECServer
Which particular DECserver?
Which TCP/IP stack?
Incoming connections? As in a login or a data feed or what?
"Commanding" a port? That's not terminology I'm familiar with.
What exactly are you doing here? (I suspect the program is rather larger than the four lines of descriptive text included here; there's unfortunately not much to go on here, and not enough to even really guess as to what's going on. Pretty clearly there's something wrong in how you're sending commands to the remote device.)
What device is on the far side of the DECserver port, and what does it do?
Most folks use reverse telnet (see the OpenVMS FAQ) and this maps a port to a host TN device, the TN device looks and works like a terminal. It appears you're providing for a very different application requirement here.
Stephen Hoffman
HoffmanLabs LLC
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тАО04-02-2008 08:04 AM
тАО04-02-2008 08:04 AM
Re: TCPIP to a DECServer
Any suggestions would be helpful.
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тАО04-02-2008 10:04 AM
тАО04-02-2008 10:04 AM
Re: TCPIP to a DECServer
Here, I'd usually use reverse telnet and establish the mappings and the host telnet TN terminal devices linked to the DECserver ports with modems. Reverse telnet looks and works like an inbound telnet connection arriving at the host, but the telnet connection is originated at the host and is outbound. Hence the use of "reverse" here.
You can then SET HOST /DTE out one of the TN devices, and off you go chatting with the modem.
For programmatic access, you can open the TN device and treat it (more or less) like an existing terminal device.
I reworked a semi-related section of System Manager's Manual a while back, around the chapter on Understanding and Using Modems on OpenVMS. This updated section introduces the modem hardware, wiring and general concepts and approaches around using modems with OpenVMS.
For your case, the DECserver port would likely be bound using the reverse telnet mechanism, and you would then issue SET HOST /DTE or related commands against the telnet TN device on the host. Possibly including the Hayes AT dial sequence, as required. You could (mostly) ignore the use of the DECserver in this configuration.
Reverse telnet itself is (quickly) described in the OpenVMS FAQ section "How can I set up reverse telnet (like reverse LAT)?" and full details are available in the TCP/IP Services Management Manual, available at the OpenVMS documentation site in the TCP/IP Services shelf.
http://www.hoffmanlabs.com/vmsfaq
http://www.hp.com/go/openvms/doc
Here's a related write-up on the general topic of DECserver devices from Colin Butcher's xdelta web site:
http://www.downloads.xdelta.co.uk/decus%20uk%202002/decserver%20seminar%2026feb2002%20issue%207%2002nov2003.pdf
I'd point to other links at the HP OpenVMS site, but a number of spots at the web site are returning SSI errors, incomplete or missing or otherwise omitted (or now archived or retired?) data, or other oddities.
--
Now ITRC itself is being (unusually) flaky. Trying a re-post. Apologies if this gets duplicated; I did check to see if the previous posting attempts got through.
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тАО03-10-2009 08:50 AM
тАО03-10-2009 08:50 AM