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- Newsgroups: comp.sys.encore,comp.dcom.modems,comp.dcom.servers
- Path: sparky!uunet!wupost!usc!sdd.hp.com!think.com!paperboy.osf.org!loverso
- From: loverso@osf.org (John Robert LoVerso)
- Subject: Re: Hardware flow control with Annex Terminal Server and Telebit modems
- Message-ID: <1992Jul25.184625.18752@osf.org>
- Keywords: RTS/CTS, modem, terminal server, telebit, annex
- Sender: news@osf.org (USENET News System)
- Organization: OSF Research Institute, Cambridge MA
- References: <BruHD3.9CI@cs.psu.edu>
- Date: Sat, 25 Jul 1992 18:46:25 GMT
- Lines: 32
-
- Older Annexes (Annex-I and Annex-II) only have 2 control lines - one input
- and one output. These are under software control and can be configured as
- either DTR/DCD or RTS/CTS. If you use the settings you suggest:
-
- |> set port control_lines flow_control
- |> set port input_flow_control eia
- |> set port output_flow_control eia
-
- then the line that was previously "DTR" becomes "CTS", etc. This means you
- need to make sure the port is wired correctly. And, you can no longer use
- DTR/DCD for modem control.
-
- One of the Annex-II variants (Annex-IIa) included a new daughter card that
- had 2 pairs of control lines. This was done by using a non-standard champ
- (aka telco) 50-pin cable, where a single GND was shared amoung all 8 ports.
- On these Annex-IIa, there is a new value "both" for "control_lines" that
- lets you enable DTR/DCD and CTS/RTS simultaneously. This totally removes
- the case where the the DTR line is shared with CTS.
-
- Encore only built Annex-Is and "old" Annex-IIs. However, Xylogics did (does?)
- supply the Annex-IIa to Encore with Encore-markings, so you can't go by
- that. Just look at the "stats" output.
-
- Cables used by the IIa are not compatible with other Annex-IIs.
-
- The Annex-3 only has 6 ports per champ connector, so it has always had
- both sets of control lines (and it has DSR, to boot). One of the micro-
- Annexes probably has "full" modem control, too.
-
- I have all my Worldblazers on an Annex-3 and run with control_lines == both.
-
- John
-