carroll@unirot.UUCP (mark carroll) (12/08/86)
Im currently working on a Bulletin Board system for the amiga, using CSIs
multi-forth. ( Which is a FANTASTIC product). My problem is
A> How can I detect when my modem loses a carrier? The SerErr Carrier
lost NEVER occurs unless I unplug my modem from the computer.
B> How can I drop the line without using the AT command? I know I can
shut off the DTR by closing the serial device. But when I do it this was,
when I try to reopen the serial.device for the next user, the system
crashes. Can I shut off DTR without closing the device? And does
anyone have any suggestions on why reopening the serial device crashes
the system? This also happens if I exect DBWs vt100, and run my system.
Thanks in advance for your assistance,
Mark Carroll
ARPA: CARROLL@Aim.rutgers.edu
uucp: !rutgers!unirot!carrolllyles@tybalt.caltech.edu (Lyle N. Scheer) (12/08/86)
In article <197@unirot.UUCP> carroll@unirot.UUCP (mark carroll) writes: > > Im currently working on a Bulletin Board system for the amiga, using CSIs >multi-forth. ( Which is a FANTASTIC product). My problem is > A> How can I detect when my modem loses a carrier? The SerErr Carrier > lost NEVER occurs unless I unplug my modem from the computer. That sounds like a modem problem, not an Amiga problem. It sounds like your modem constantly sends the carrier detect signal. In fact, it sounds as if you have a Volksmodem 12, which does that. If so, there are some dip-switches in back, one of will will set it so CDC is always set, or works normally. If you have some other modem, I'd look in the manual for such a switch/software toggle. IF the above is not the solution, you can do a cludge and constantly look for the input of NO CARRIER. It works, but is inelegant. > B> How can I drop the line without using the AT command? I know I can > shut off the DTR by closing the serial device. But when I do it this was, > when I try to reopen the serial.device for the next user, the system > crashes. Can I shut off DTR without closing the device? And does > anyone have any suggestions on why reopening the serial device crashes > the system? This also happens if I exect DBWs vt100, and run my system. Again, dropping the modem with DTR is dependant on the modem. Personally, I would use the +++ and ATH0, since some modems will not allow DTR, and if you want to distribute this program, people will have these modems. Your crashes are probably an element of not closing something. My base of knowledge comes from about four years of BBS programming. I've done two so far on the Amiga, one in Basic, and one in Modula-2(I'm still working on it), and before that, one on the Apple ][+ with elements of basic and 6502. I currently have a Volksmodem 12, and try to have a BBS up as much as possible. I will be happy to answer whatever modem/serial programming questions I am able to. > > Thanks in advance for your assistance, > Mark Carroll > ARPA: CARROLL@Aim.rutgers.edu > uucp: !rutgers!unirot!carroll Wonko the Sane (you call this SANE??) Disclaimer: I am totally irresponsible. So shoot me then.
chiu@princeton.UUCP (Kenneth Chiu) (12/09/86)
In article <197@unirot.UUCP> carroll@unirot.UUCP (mark carroll) writes: > A> How can I detect when my modem loses a carrier? The SerErr Carrier > lost NEVER occurs unless I unplug my modem from the computer. Did you try SDCMD_QUERY? From the manual description, it seems like it would it work, but I have not used it for that purpose. > crashes. Can I shut off DTR without closing the device? And does > anyone have any suggestions on why reopening the serial device crashes > the system? This also happens if I exect DBWs vt100, and run my system. I have had some problem with crashes while exiting. I think you have to be very careful about cleaning up, especially with the timer device. Make sure all requests have been aborted and put back, and make sure you close the device before deallocating ports, requests, etc. -- Kenneth Chiu UUCP: princeton!chiu Princeton University Computer Science Department BITNET: 6031801@PUCC