Re: Can I connect two Sun's via serial ports?

Dave wrote:
> It's just a lot more convenient if I can avoid any additional hardware.
> I think a simple serial cable can work. On the SS20 the two serial ports
> are in the one connector - I suspect in the U60 they are separate, I
> can't recall. So a Y-cable, with both serial ports wired on the SS20
> plug, and two connectors on the U 60, will allow either machine to have
> console access to the other, which is enough really.

Yes, the U60 has two separate DB-25F ports while the SS20 combines them
into one (at least that is what I find on our E220R which uses the U60
motherboard).
Connecting A to B between both systems will allow "tip hardwire" to
connect to the console port on the other system.

I wouldn't pay $200 for a Y cable - I made my own when we were still
using an SS20. 3x DB-25F (solder type if you can solder, crimp pin type
if you have a crimper [the only type that would probably be of no use
would be IDC crimp type]), 3x backshells plus two lengths of 3 to 8
core cable should not set you back too much.

A quick Google located the following:

The pin numbering for the DB25 (female) connector marked
as 'A/B' on the back of the SparcStation 20 is as follows:

1 1 1 1
3 2 1 0 9 8 7 6 5 4 3 2 1
+---------------------------------------+
| x x x o o x x x x x x x o |
\ x x o o o x x x x x x x /
\-------------------------------------/
2 2 2 2 2 2 1 1 1 1 1 1
5 4 3 2 1 0 9 8 7 6 5 4

Reprinted from the Sun Microsystem Inc.'s
Desktop SPARC Hardware Owner's Guide (Dec '92).
The following is the pinout of the Serial Port A/B connector:

Pin Circuit Signal Direction Description
--- ------- ------ --------- -----------
1 none none -- not connected
2 BA TD output Transmit Data, Port A
3 BB RD input Receive Data, Port A
4 CA RTS output Request to Send, Port A
5 CB CTS input Clear to Send, Port A
6 CC DSR input Data Set Ready, Port A
7 AB SG -- Signal Ground
8 CF DCD input Data Carrier Detect, Port A
9 none none -- not connected
10 none none -- not connected
11 SCD SDTR input Data Terminal Ready, Port B
12 SCF SDCD input Data Carrier Detect, Port B
13 SCB SCTS input Clear to Send, Port B
14 SBA STD output Transmit Data, Port B
15 DB TC input Transmit Clock, Port A DCE source
16 SBB SRD input Receive Data, Port B
17 DD RC input Receive Clock, Port A
18 SDB STC input Transmit Clock, Port B
19 SCA SRTS output Request to Send, Port B
20 CD DTR output Data Terminal Ready, Port A
21 none none -- not connected
22 none none -- not connected
23 none none -- not connected
24 DA TC output Transmit Clock, Port A DTE source
25 DA TC output Transmit Clock, Port B DTE source

.

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