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- Path: sparky!uunet!spool.mu.edu!uwm.edu!src.honeywell.com!tcscs!zeta
- From: tcscs!zeta@src.honeywell.com (Gregory Youngblood)
- Newsgroups: comp.os.os2.misc
- Subject: Re: Make COM3 talk to COM4
- Message-ID: <ee4TwB2w165w@tcscs.UUCP>
- Date: Sun, 03 Jan 93 22:55:01 CST
- References: <1i89l3INNte@usenet.INS.CWRU.Edu>
- Reply-To: zeta%tcscs@src.honeywell.com
- Organization: TCS Consulting Services
- Lines: 48
-
- al919@cleveland.Freenet.Edu (Bruce Halco) writes:
-
- >
- > Some DOS software I'm writing involves async communications, and
- > I figured using OS/2 to serve as 2 DOS machines would be more
- > convenient than hooking up two physical computers. So I
- > installed a 2-port serial card as COM3 and COM4 and looped the
- > connectors back on the card. I modified CONFIG.SYS to correspond
- > with the serial ports thusly:
- >
- > DEVICE=C:\OS2\COM.SYS (3,3E8,5) (4,2E8,9)
- >
- > But I _CAN NOT_ get reliable communications between the ports.
- > What really drives me nuts is that I don't even get REPEATABLE
- > results. One time I'll need COM_DIRECT_ACCESS on, the next day
- > it needs to be off. COM_SELECT is restricted to the individual
- > ports. IDLE_SENSITIVITY is set to 100 (disabled). I know the
- > physical connection is OK because I can send individual bytes
- > with DEBUG. Even when it _almost_ working, one port will send
- > for a while, than pause until I hit a key in that session. Other
- > times it sends nothing, or even refuses to start the session with
- > an error about another session having access to that port (even
- > if nothing else but the WPS is running). I've about run out of
- > DOS session settings to modify, and I think I'm completely on the
- > wrong track by now. What have I overlooked? BTW, the system is
- > a 486/33, 16M RAM, SP installed over the GA release.
- >
- > Any and all suggestions will be welcomed.
-
- I'm not sure, but I'm doing the same thing. I haven't been able to get it
- going myself. Frist suggestion. Use external cables, don't try to jumper
- the two on the card itself. Second suggestion. Get a NULL Modem cable,
- or get a cable and null modem adapter.
-
- The trick is to:
- 2 to 3
- 3 to 2
- 7 to 7
- 5,20 to 8 ? I think
- There are several needed to be complete. Dont have that information off the
- top of my head.. sorry.
-
- Greg
-
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