[johnnym]

Can you please track down and post the pinout...I found nothing for NULL modem cabling for a one-to-many RS-422 protocol, that's why I didn't post such a claim myself.  Computer-to-Device cabling on the above site already swaps TX and RX in RS-422 cabling for "computer to device" picture shown..isn't what a cable to dumb terminal would do anyway?  OP asked for serial terminal interface, doesn't the "computer-to-device" cable presented not appear to be that?

Can you please provide a source, I cannot find one single reference to a Null modem cable pinout existing for RS-422, since it's a master-slave (multi-slave capable bus) it doesn't appear to need it.

I use null modem cables I originally created for accessing my Power Macs wih Stealth Serial Port. I used the connection scheme as described here:

Code:

Mini DIN-8 (male) | DB-9 (female) | RS-232 Signal
------------------+---------------+--------------
1                 | 8, 6, 1       | CTS, DSR, DCD
2                 | 7             | RTS
3                 | 2             | RXD
4                 | 5             | SGND
5                 | 3             | TXD
6                 | -             | NC
7                 | 4             | DTR
8                 | 5             | SGND

I use these cables to access my Indigo, Indigo²s, Indys and Origin200 (MSC port). I am currently unaware of any hardware configuration inside SGI machines that switch from RS-232 to RS-422. This worked for me out of the box for all machines listed, so it's either detected automatically or it's prefconfigured to RS-232. Or my serial to USB adapters have a play in here.