There is equipment: 3com 4200 switch , you need to connect to it with a console cable for configuration. The manual says that he himself determines the connection speed, 8-bit date and 1-stop bit. Under the console, the default speed is 119200. When you try to connect to the equipment, even directly to any computer port with these settings, there is no answer. I connected via putty and using minicom, I also tried to sort through different speeds. The switch itself is physically linked, although the network does not give out (most likely the subnet unknown to me is set up), respectively, through the web does not get through the same way. Is there a utility for auto-detect connection speed? To understand for sure live equipment or not.

    1 answer 1

    1. Try first to plug in the console cable and set the port parameters, and only then turn on the switch.

    2. In switches, a set of parameters 9600-8-N-1 is more common. Generally, 8-N-1 - it is almost always and everywhere so, you can only cross speeds. Flow control should almost always be turned off, both CTS / RTS and XON / XOFF.

    3. Look at the cable. It is likely that TX and RX (2 and 3 pins) are re-crossed when this should not be. Or, on the contrary, they are not crossed, and for some reason the equipment is made for a null modem. Try to change the wiring.

    • Thank you, on the first point I will try to do so. The cable itself is exactly serviceable, connected them with other equipment. And then the explanation is, is there a hardware flow control, is there a software one, do you turn them off both? - Vasiliy Kuramshin
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      Turn off both. The fact that the "cable is good" does not mean anything. It may be serviceable, but not so. I, by the way, read the manual for the switch for you. On page 39 it is clearly stated that there must be a null modem cable, on page 69 its wiring (for a 9-pin port) is shown: TX and RX should be crossed. On page 40 there are port parameters: 19200, 8N1, no hardware flow ctrl. That is, I recommend starting with p.3, and not with p.1 - Alexander Prokoshev
    • I honestly read it, apparently missed. thank. - Vasiliy Kuramshin