Hi Guys
I’m trying to connect two terminals together, each with their own 56k dialup modem, and an ordinary phone cable connected between them.
One is an old XP laptop running Win XP using the Hyperterminal program, and it’s internal modem, and the other is a 56k portable travel modem.
Both modems can echo back to their respective terminal programs, and both also respond to AT commands with “OK” etc.
I’ve had no luck getting them to connect though. There are a few small articles about, and a YouTube video demo of the same,
and they all use ATA for the terminal doing the answering. The command used to dial varies from a simple “ATD” to something that might cause
the modem to ignore the fact that there is no dial tone without a real phone exchange. Some examples are “ATX3D” or “ATX1D”.
I hear that the function of the “X” command can vary between modems. I can get both modems to make noises by answering,
and one modem to make noises by dialling with some variations of the “ATD” command. It doesn’t matter if I have to dial with one of them all the time.
Ultimately, they both quit with a “NO CARRIER” message, and I have never heard anything that suggests to me they are responding to each other.
Is there a physical (electrical) reason for this (assuming everything is working), or a possible incompatibility that would prevent them even connecting to each other?
Cheers, Brek.