Sun IPX Ports and Pinouts

 The material below is cribbed and specialized for the ipx from the unix serial port resources, the serial console on sun or sgi systems FAQ, and the networktechnic pinout page for pc, sun and mac. Another link for pinouts of the world's nicest keyboard, which is not compatible with the ipx, but is still a very nice classic keyboard so it deserves to be listed here.

 

Serial ports

 The IPX has two round mini DIN-8 serial ports, labeled A and B. The are accessed via dev/ttya and /dev/ttyb.

looking into the ipx
Mini DIN-8 pinouts
a photo
serial ports A & B
Mini DIN-8
1 DTR
2 CTS
3 TX
4 GND
5 RX
6 RTS
7 DCD
8 RTXC (receive clock)
note the lack of DSR
 

 

 Console: If there is no keyboard attached then the console is bound to serial port A at 9600 baud, 8N1. Ctrl-A (which interrupts the boot and drops you into the ROM) is accessed via the rs-232 break signal (rx held low for longer than a byte time). The minimum that must be connected for a console connection is Tx, Rx and Gnd (pins 3, 4 and 5). That's what I do. Apparently a old Mac serial cable will do as well, but I haven't tried it.

 Port voltage: Many Sun cpu serial ports can be configured as either RS-232 (+/- 12V) or RS-423 (+/- 5V). Defaults vary. See the hardware documentation for your machine to locate the jumper to configure this, if it exists. Most implementations do not have to worry about the voltage on the serial port.

 PC Serial ports: For reference, here are typical PC serial port pinouts:

DB-9
1 GND
2 RX
3 TX
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9  
DB-25
1 GND
2 TX
3 RX
4 RTS
5 CTS
6 DSR
7 GND
8 CD
9  
10  
11  
12  
13  
14  
15  
16  
17 RTXC
18  
19  
20 DTR
21 RI
22  
23  
24  
25