logajan@ns.UUCP (John Logajan x3118) (12/28/88)
I could use the RTS/CTS method of flow control for the AUX (RS232) port. But it seems to be non-standard in that you have to jiggle (as Internals says) the CTS signal for each character, and most external products don't. Any clues on this? -- - John M. Logajan @ Network Systems; 7600 Boone Ave; Brooklyn Park, MN 55428 - - ...rutgers!umn-cs!ns!logajan or john@logajan.mn.org -
kloppen@gmdzi.UUCP (Jelske Kloppenburg) (01/03/89)
From article <1043@ns.UUCP>, by logajan@ns.UUCP (John Logajan x3118): > I could use the RTS/CTS method of flow control for the AUX (RS232) port. > But it seems to be non-standard in that you have to jiggle (as Internals > says) the CTS signal for each character, and most external products don't. > > Any clues on this? > > -- > - John M. Logajan @ Network Systems; 7600 Boone Ave; Brooklyn Park, MN 55428 - > - ...rutgers!umn-cs!ns!logajan or john@logajan.mn.org - You are right. With RTS/CTS-On the CTS has to drop and come back for each character. The correct use of RTS and CTS is for MODEM control. RTS switches the sender to on (In German: Sendeteil einschalten) and the modem answers with CTS. By the way, the partner modem signals that by Carrier Detect (DCD). You can (ab)use RTS/CTS for a oneway flow control on a line whithout modems. And you can alter the conventions... so you have to jiggle... If you want to use RTS/CTS in a correct manner on an ATARI ST, you have to replace the interrupt serving routines of the TOS. I tried it in a program written in MODULA-2 and in an assembler program for the AUTO folder. In both cases I succeeded, so it is possible. --- kloppenburg@kmx.gmd.dbp.de kloppen@gmdzi.uucp