Scsi terminator placement...

[Jose]

I got this 68 pin SCSi cable from eBay for my A4000 but the bloody thing has an undetachable terminator in one end (well till I cut it off that is). The termination needs to be at both ends of the chain IIRC so this won't work if I use more devices than the cable allows (i.e. adding an internal to external adapter and prolong the chain with more external devices like DVD burner and external HD) ?

:pint:

[Jose]

Wish I had a CPPC (it's still on my plans though). I have a WarpEngine wich has a 50 pin scsi2 header. But I decided to get the 68 pin cable anyway, I already have a F-F 50 to 68 adapter, it will serve me the day I get a CSPPC. With what I have now I don't think the remaining lines need to be terminated.
If the terminator on the WarpEngine could be turned off I could use the one on the cable, like the CPPC setup you described above, but unfortunately there seems to be no jumper to turn it off (already checked the manual).

[Jose]

@tonyvdb
"...If your adding an external SCSI devise then just add the adapter somwhere in between an run it out the back of your case."
That config would be awkward. Are you sure that would conform to termination rules ? Just to make sure we're talking the same thing, it would look like this:
(- WE stands for WarpEngine, T for terminator)

Code: [Select]

WE(T)--CableNode1--Node2--Node3--Node4--T
                     |      |      |
                     |      |      |
                    HD    DVD    ExternalAdapter
                                   |
                                   |
                                  DVD Burner1
                                   |
                                   |
                                ExternalHD
                                   |
                                   |
                                DVD Burner2
                                   |
                                   |
                                  etc.code

[Jose]

Got the drawing to display correctly...

I guess it's better to try it then cut off the terminator, as it's gonna be usefull if I ever get a CSPPC.

Cheers

[Jose]

@Patrik
"Keep the terminator and place it at the WE-end and remove the termination from the WE. ..."

I just read the manual and the only thing related to disabling termination on the WarpEngine is a jumper (Jumper1) that disables termination power. However if the card has termination resistors (apparently most cards had them but some didn't) they won't be disabled.
 
Will just disabling termination power be enouph ?

If not this will probably cause all kinds of problems cause the chain will be terminated right at it's beginning.

[Jose]

@Patrik
That's one awesome site!

@All
I only have one doubt left. If there are multiple "daughter" chains connected to the main scsi cable that comes from the scsi host adapter, do you have to terminate each one of them ? According to that site Patrik posted and others I've googled, the termination must only be made on two places. Maybe that's assuming there are no multiple chains. If not then SyrTran has his termination badly done.

[Jose]

BTW, thanks for pointing out the resistors on the WE can be taken off, the manual doesn't clearly say that and I wasn't sure...