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From: paul@mecazh.uu.ch (Paul Breslaw)
Newsgroups: comp.sys.hp
Subject: RS232 Hardware Handshaking
Keywords: UUCP, hardware handshaking, modems
Message-ID: <429@node17.mecazh.uu.ch>
Date: 30 Aug 90 09:54:12 GMT
Reply-To: paul@mecazh.uu.ch (Paul Breslaw)
Organization: Mecasoft SA, CH-8057 Zurich, Switzerland
Lines: 65


We have upgraded a working 2400 baud UUCP/CU system with a 9600 baud modem, 
and a new serial multiplexer card. It is some time since we looked at the 
way the system was configured, and because the modem is now faster than some 
of our callers, we need to introduce a few features that were not present on 
our old system.

That is where our problems began. To the details:-

Machine: HP9000/330
OS     : HP-UX 6.5
MUX    : HP 98642
Modem  : Multitech V.32

Requirements:-

 - Bi-directional UUCP on the same serial port.
 - Call-in and call-out cu(1) on the same port as the UUCP.
 - Hardware (CTS/RTS) handshaking initiated by the modem.

This last requirement is to take advantage of the modem's capability of 
locking its speed with the computer regardless of the speed of its line 
connection. The benefit of this is that the gettydef entry is simple, and so 
are my UUCP callers' chat scripts, since they do not have to send the right
number of BREAKs for their individual connection speeds. (In fact they don't 
have to send BREAK's at all).

We need to know the following information.

 1. What is the correct cable to use.
 2. What is the correct getty to run (ie getty or uugetty).
 3. What is the correct gettydef entry.
 4. What are the correct minor device numbers for:-

      /dev/cua13          the auto-dialler line
      /dev/cul13          the uucp call out line
      /dev/ttyd13         the dial-in (getty) line
      /dev/tty13          to set up the modem (ie. cu -s 9600 dir)

Our previous configuration works fine except for the hardware-handshaking.

With regard to getty, we have used uugetty in the past. But I have noticed 
recently from modem(7) and various utterances on the Net that bog-standard 
getty will do.

The minor device number seems to be a major stumbling block, because
nobody at HP whom I spoke to had had any experience of using the same line 
as call-in/call-out. 

Further the HP documentation is contradictory about bit 3. One piece of 
documentation states that as of HP-UX 5.2 Bit 3 of the minor device number 
implements CTS/RTS handshaking. The spec for the HP98642 says NA against 
Bit 3. The documentation for modem(7) says that setting the device to CCITT 
mode (Bit 2) enables handshaking, as did someone at HP.

Can anyone who has actually had this working, provide the information I need.


Paul Breslaw

-- 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Paul Breslaw, Mecasoft SA,          |  telephone :  41 1 362 2040
Guggachstrasse 10, CH-8057 Zurich,  |  e-mail    :  paul@mecazh.uu.ch
Switzerland.                        |               mcsun!chx400!mecazh!paul