Network protocols - RS232 Serial

From: M H Stein <mhstein_at_usa.net>
Date: Mon Oct 22 04:05:38 2001

-------------Original Message-----------------

Date: Thu, 18 Oct 2001 23:17:52 +0100 (BST)
From: ard_at_p850ug1.demon.co.uk (Tony Duell)
Subject: Re: Network protocols - RS232 Serial

> Sorry, typon on my part. Mine also says 'Digital Products Inc' on it.

> I've got a couple of different models here.

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Well, I guess Product*S* is appropriate after all... They did indeed make quite a few different combinations, as well as the PrintDirector and DeviceDirector Printer/Terminal port sharing units, but I don't see yours listed in any of my literature; musta been older or newer than mine. I do see an NC7 (4S/3P) and some of the MultiSpool Print Directors were S/P combos.

These are serial-only single-board babies, 16 RJ-45's along the back of the board, using standard DIP 256x1 RAMs. When you look at it, it sure doesn't look like $3000 worth... Now if they'd put some LED's on the front panel, say 4 per port, all blinking away merrily...

We used them in two applications: One was collecting data from a bunch of AIM65's (later replaced by PC's) monitoring stock thickness in a brass rolling mill and sending it to a central Cromemco (also later replaced by a PC), and the other was a bond trader who used them to broadcast news of a new issue to his clients over dedicated lines, so some of them have been modified to simultaneously broadcast 1 port to the other 15 ('cause ya couldn't have one client getting the news before another, even at 9600 baud; that's how hectic the bond business is).

mike
Received on Mon Oct 22 2001 - 04:05:38 BST