Path: utzoo!attcan!uunet!lll-winken!xanth!ames!elroy!usc!pollux.usc.edu!addison
From: addison@pollux.usc.edu (Richard Addison)
Newsgroups: comp.sys.amiga.tech
Subject: Re: modem drops 0x11
Summary: 0x11 = XON
Keywords: modem, serial
Message-ID: <17176@usc.edu>
Date: 12 May 89 07:29:32 GMT
References: <431ebd96.15abd@gtephx.UUCP>
Sender: news@usc.edu
Reply-To: addison@pollux.usc.edu (Richard Addison)
Organization: University of Southern California, Los Angeles, CA
Lines: 137

In article <431ebd96.15abd@gtephx.UUCP> carnesm@gtephx.UUCP (Mark E. Carnes) writes:
>I just came across something very perplexing, and I was hoping someone out in 
>net.land might have an idea.  I have been writing a game to be played across
>the modem between two computers.  It works pretty well, except occasionally it
>will get "confused".  I tracked it down and it appears that 0x11 is not being
>transmitted.  I dumped the characters just before I wrote them to the serial
>device, and had the receiving computer dump everything it received.  All the
>characters were transmitted except for 0x11.  I reproduced it several times
>each time when a 0x11 should have been sent it "disappeared".  

Well, as it happens, 0x11 is XON (Control-Q).  This is used for flow control
along with 0x13 (XOFF, Control-S).  You'll need to use RTS/CTS flow control
if you want to pass this characters all the way through.  Note that this
means the modems have to be configured to pass 0x11 and 0x13 without acting
upon them.

If you want your program to be easy to set up for anyone that might want to
use it (i.e. without having to goof around with getting their modems set up
correctly), I would suggest you try to stick with 0x30 through 0x7F.

Richard Addison
"Is there such a color as Pirandello

Newsgroups: comp.sys.amiga.tech
Subject: Re: modem drops 0x11
Summary: 
Expires: 
References: <431ebd96.15abd@gtephx.UUCP>
Sender: 
Reply-To: addison@pollux.usc.edu (Richard Addison)
Followup-To: 
Distribution: 
Organization: University of Southern California, Los Angeles, CA
Keywords: modem, serial

Newsgroups: comp.sys.amiga.tech
Subject: Re: modem drops 0x11
Summary: 0x11 = XON
References: <431ebd96.15abd@gtephx.UUCP>
Reply-To: addison@pollux.usc.edu (Richard Addison)
Organization: University of Southern California, Los Angeles, CA
Keywords: modem, serial

In article <431ebd96.15abd@gtephx.UUCP> carnesm@gtephx.UUCP (Mark E. Carnes) writes:
>I just came across something very perplexing, and I was hoping someone out in 
>net.land might have an idea.  I have been writing a game to be played across
>the modem between two computers.  It works pretty well, except occasionally it
>will get "confused".  I tracked it down and it appears that 0x11 is not being
>transmitted.  I dumped the characters just before I wrote them to the serial
>device, and had the receiving computer dump everything it received.  All the
>characters were transmitted except for 0x11.  I reproduced it several times
>each time when a 0x11 should have been sent it "disappeared".  

Well, as it happens, 0x11 is XON (Control-Q).  This is used for flow control
along with 0x13 (XOFF, Control-S).  You'll need to use RTS/CTS flow control
if you want to pass this characters all the way through.  Note that this
means the modems have to be configured to pass 0x11 and 0x13 without acting
upon them.

If you want your program to be easy to set up for anyone that might want to
use it (i.e. without having to goof around with getting their modems set up
correctly), I would suggest you try to stick with 0x30 through 0x7F.

Richard Addison

Newsgroups: comp.sys.amiga.tech
Subject: Re: modem drops 0x11
Summary: 0x11 = XON
References: <431ebd96.15abd@gtephx.UUCP>
Reply-To: addison@pollux.usc.edu (Richard Addison)
Organization: University of Southern California, Los Angeles, CA
Keywords: modem, serial

In article <431ebd96.15abd@gtephx.UUCP> carnesm@gtephx.UUCP (Mark E. Carnes) writes:
>I just came across something very perplexing, and I was hoping someone out in 
>net.land might have an idea.  I have been writing a game to be played across
>the modem between two computers.  It works pretty well, except occasionally it
>will get "confused".  I tracked it down and it appears that 0x11 is not being
>transmitted.  I dumped the characters just before I wrote them to the serial
>device, and had the receiving computer dump everything it received.  All the
>characters were transmitted except for 0x11.  I reproduced it several times
>each time when a 0x11 should have been sent it "disappeared".  

Well, as it happens, 0x11 is XON (Control-Q).  This is used for flow control
along with 0x13 (XOFF, Control-S).  You'll need to use RTS/CTS flow control
if you want to pass this characters all the way through.  Note that this
means the modems have to be configured to pass 0x11 and 0x13 without acting
upon them.

If you want your program to be easy to set up for anyone that might want to
use it (i.e. without having to goof around with getting their modems set up
correctly), I would suggest you try to stick with 0x30 through 0x7F.

Richard Addison
"Is there such a color as Pirandello

Newsgroups: comp.sys.amiga.tech
Subject: Re: modem drops 0x11
Summary: 
Expires: 
References: <431ebd96.15abd@gtephx.UUCP>
Sender: 
Reply-To: addison@pollux.usc.edu (Richard Addison)
Followup-To: 
Distribution: 
Organization: University of Southern California, Los Angeles, CA
Keywords: modem, serial

Newsgroups: comp.sys.amiga.tech
Subject: Re: modem drops 0x11
Summary: 0x11 = XON
References: <431ebd96.15abd@gtephx.UUCP>
Reply-To: addison@pollux.usc.edu (Richard Addison)
Organization: University of Southern California, Los Angeles, CA
Keywords: modem, serial

In article <431ebd96.15abd@gtephx.UUCP> carnesm@gtephx.UUCP (Mark E. Carnes) writes:
>I just came across something very perplexing, and I was hoping someone out in 
>net.land might have an idea.  I have been writing a game to be played across
>the modem between two computers.  It works pretty well, except occasionally it
>will get "confused".  I tracked it down and it appears that 0x11 is not being
>transmitted.  I dumped the characters just before I wrote them to the serial
>device, and had the receiving computer dump everything it received.  All the
>characters were transmitted except for 0x11.  I reproduced it several times
>each time when a 0x11 should have been sent it "disappeared".  

Well, as it happens, 0x11 is XON (Control-Q).  This is used for flow control
along with 0x13 (XOFF, Control-S).  You'll need to use RTS/CTS flow control
if you want to pass this characters all the way through.  Note that this
means the modems have to be configured to pass 0x11 and 0x13 without acting
upon them.

If you want your program to be easy to set up for anyone that might want to
use it (i.e. without having to goof around with getting their modems set up
correctly), I would suggest you try to stick with 0x30 through 0x7F.

Richard Addison