Sun Serial Port Configurations
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Serial Console on a Sun or SGI System How To: Serial Console Summary Connect, via a null modem, serial port 'A' of the Sun to your terminal's serial port. Your terminal settings should be 9600 8N1, which are the default serial settings of the Sun. If possible, emulate a VT-100 terminal (almost every terminal does). DO NOT connect a keyboard to the Sun machine. The Long Version First, let's examine the serial port of your box.
They generally come in 2 types, with one exception. The first is the standard 25pin serial port. This is generally recognized as a female connector of the back of the machine, with 2 rows of pins in a 'D' style connector (see figure 1). The second type is a 'mini-din' style connector. This is a round, inset female connector with 8pins, and a notch to tell you which side is up when plugging it in (see figure 2).
The one notable exception is a 25pin connector which contains both the 'A' and the 'B' serial ports. If you plan to use both serial ports, you'll need to obtain a special 'Y' splitter cable, but if you only want to use serial 'A', then you're fine with the standard serial cable. Why Sun did this to us is not known. Whichever port you have, you need to obtain the right cable for it, and any other adapters you may need to get it to your terminal (for example, you might have a 9pin serial port on your PC, if you're using that as your terminal). I generally keep all my connections 25pin, right up to the point that I adapt it to 9pin my PC. This allows me the greatest flexibility when searching for null-modem adapters, gender changers, etc, as most decent computer stores, and even most Radio Shacks will carry the appropriate pieces I need when I'm trying to connect two dissimilar pieces of equipment.
If you've got the mini-din serial ports, look for a Macintosh serial cable made to work with external modems - all the currently manufactured ones have the hardware handshaking pin and will work fine with a Sun. Beware very old Mac serial cables though, as they lack the hardware handshaking pin, and will result in more problems for you down the road. Even the newer Mac serial cables are getting harder to find, as Mac's now either have internal modems or are going USB, and as a result, you may have to scrounge around for an appropriate cable. If you can find a Sun serial cable for these machines, all the better! Okay, so you've got a serial cable connected the the Sun, all you need to do now is place a Null-Modem Adapter (or a null modem cable) between the Sun and your terminal. Do not be fooled into using a 'Laplink' cable, this will just cause you problems. You need a true null-modem connection.
If you cannot obtain this item, you can always build one if you can get the parts (see below for more information on building an adapter). Let me mention now that there should NOT be a keyboard connected to the Sun. Sun machines on power-up look at the keyboard port. If something is plugged in, they assume the console is a keyboard and monitor locally connected. If it doesn't see any keyboard, it redirects console input/output to serial port 'A'. Whether or not you have a 'framebuffer' card installed is irrelevant. In fact, some Sun machines have a framebuffer built in, so there's no way to remove it, hence, the sense test is done at the keyboard port.