01-31-2018, 05:11 PM
(01-31-2018, 12:59 PM)Baldrick Wrote: I've been poking around some more with the WiModem232 and I have a few questions regarding disconnection.
The first issue is how it is handling remote hangups. That is, when the WiModem232 is set to answer calls and a call is established from a remote source (in this case it was from a telnet client) it will answer the call successfully returning the code 2 for "RING" and 1 for "CONNECT" and a connection is established.
However, there are issues when the remote client disconnects.
The WiModem232 doesn't always know that the remote client has disconnected and happily sits there with its green LED lit.
Is there a way to firm up this behaviour?
I am also looking for a way to inform the DTE (the computer) that the DCE (the WiModem232) that it has disconnected the call. Normally this is the CD signal, but the Apple IIc lacks a CD pin (as does ADMIN's Laser-128) so in those cases the modem ought to drop the DSR signal to let BBS software know that the connection has been lost.
The Hayes reference manual's command would be AT&S0, but this does not appear in the WiModem manual.
Is the jumpered version of the bottom connections on page 20 the way to accomplish this?
If the LED is green, then the remote did NOT disconnect. That connection/disconnection is all part of the client service handled by the ESP8266 libraries. I have no control over this. If the client thinks it's connected, then the LED stays green until it *really* disconnects. Whatever you are testing is not actually disconnecting from the WiModem232.
You can connect the DCD pin to the DSR pin on your cable. There is no way to set jumpers for this to occur. The jumpers are meant for DTR/DSR handshaking for printers, and we are coming to find out that most of the printer cables have DTR/DSR from the printer connected to RTS/CTS on the DB25 (WiModem232) end of the cable so you don't actually have to change the jumpers. Terminal programs (like ProTERM) and other BBS's look for NO CARRIER to appear on disconnection. So, if you want DCD, tie it to the DSR pin at the connector that plugs into your computer.