grunau_b@husc4.harvard.edu (justin grunau) (11/30/86)
Does anybody have any idea how to reset the RS232 port by software? I have encountered a certain sporadic problem (I have had the same problem working with several software packages, several modems, and on several different kinds of machines [PC-DOS, Mac, ST], so I don't think it is a fault of my particular modem, my ST's port, or either Uniterm or the VT52 desk acc. The problem is that sometimes (usually I think when I get garbage from the host I am dialing up to: such as for instance when I accidently dump the contents of a binary file to the screen, or when the host does not start out at the right baud rate, etc.), the RS232 port seems to get frozen. The actual problem seems to be that keys I type do not get transmitted to the Modem (you don't see the little lights flash on the modem). The modem itself has not stopped working, nor has the carrier been lost. The most interesting thing is that (from Uniterm for instance) the BREAK signal DOES get transmitted to the modem, even under these conditions; but the port will not accept anything else. Does anybody have any idea what this problem is, or how one might correct it short of resetting the ST (that always works, which is good evidence that it has nothing to do with the MODEM per se)? JJMG