Newsgroups: comp.sys.apple2 Path: news.uiowa.edu!hobbes.physics.uiowa.edu!newsrelay.iastate.edu!vixen.cso.uiuc.edu!uwm.edu!lll-winken.llnl.gov!ames!waikato!comp.vuw.ac.nz!actrix.gen.nz!dempson From: dempson@atlantis.actrix.gen.nz (David Empson) Subject: Re: ProTERM Message-ID: Sender: news@actrix.gen.nz (News Administrator) Organization: Actrix Information Exchange Date: Sat, 22 Apr 1995 07:34:51 GMT References: <1995Apr19.084615.1@exodus.valpo.edu> <3n79r2$6o3@bmerhc5e.bnr.ca> <3n8jp7$aso@bmerhc5e.bnr.ca> X-Nntp-Posting-Host: atlantis.actrix.gen.nz Lines: 70 In article <3n8jp7$aso@bmerhc5e.bnr.ca>, Jeffrey Robertson wrote: > > As it happens, I'm running SnowTerm. Can it not handle 9600? The > configuration screens certainly talk about faster speeds. I suspect that SnowTerm will not support hardware handshaking. Most older communications programs don't. You should be able to use 9600 without any problems, but that will be WITHOUT error correction or data compression. If you want to go faster and/or use correction/compression, you must use a higher port speed (e.g. 19200) and use hardware handshaking. It all depends on whether the program supports hardware handshaking. On a IIgs, the serial firmware will be used by most of the simple comms programs (e.g. ZLink, TIC, FreeTerm and probably SnowTerm). The IIgs firmware _does_ support hardware handshaking (set "DSR/DTR Handshake" to On), but many programs ignore and/or override the control panel settings, or do not use the outgoing handshake line correctly. The other handshaking options in the Control Panel (XON/XOFF and DCD) should be disabled. A hardware handshaking cable for the IIgs is wired as follows: IIgs (Mini-Din-8) Modem (DB-25 male) 1 Handshake Out ------------- 4 RTS (optionally also pin 20, DTR) 2 Handshake In ------------- 5 CTS 3 TxD minus ------------- 2 TxD 4 Ground ------------- 7 Ground 5 RxD minus ------------- 3 RxD 6 TxD plus no connection 7 Carrier Detect ------------- 8 DCD 8 RxD plus connect to ground (pin 4 at IIgs or pin 7 at modem) Looking at the back of the IIgs, the serial port pins are numbered: 8 7 6 5 4 3 2 1 Regarding the outgoing handshake line: the connection to the RTS pin is required for hardware handshaking. The connection to the DTR pin is optional. If connected, this allows the IIgs's handshake output to be used by normal communications software to hang up a call. For hardware handshaking operation, the modem must be told to ignore the DTR signal (AT&D0) and to use hardware handshaking (the command varies, AT&K3 is common). For non-handshaking operation, the modem must be told to not use hardware hanshaking (the command varies, AT&K0 is common) and AT&D2 may then be used to force the modem to hang up if DTR is dropped. The carrier detect signal is not specifically required for hardware handshaking, but is used by many comms programs to detect whether the modem has established (or lost) a connection. On some modems, this signal will be always on by default, and a true carrier detect indication can be enabled by using the AT&C1 command. -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand