Well, this is going to be "voodoo" as equill already stated.
Let´s begin with that SCSI troubles that might appear. You stated that the EN/SC has the ability to be terminated or not. The next this is the fact that a Macintosh Plus does not utilize an internal hard disk so in order to use a hard disk with a Mac OS You will have to connect two SCSI devices to Your Plus - although Asante doesn´t recommend this.
Well, there are some options but let us state some basics first. Old Macs like the Plus or 1xx Powerbooks are slightly different regarding their SCSI handling.
SCSI IDs
Internal (NOT external) hard disks in older Macs should (...!...) always have the SCSI ID "0". You aren´t forced to use "0" but it makes connection of external devices a bit easier ;-) Now, for the external devices it officially doesn´t matter in which order the other IDs do appear. Example:
Mac Plus .
BUT: me in personal has noticed that especially with early Macs it can solve lots (!) of problems if You take care of the ID´s order. Regarding the already mentioned example it would look like this:
Mac Plus .
Note that I wrote "can solve problems"! While others didn´t face such problems I could solve problems sometimes only this way. Second note on SCSI IDs with older Macs: try to only use IDs up to the maximum number of "3". Regarding the already mentioned example it would result in a change of SCSI IDs like this:
Mac Plus .
I noticed from my own experience that my Mac Plus behaved strange when IDs larger than "3" were used while later Macs like the SE/30 didn´t bother about it very much. I think it depends on the SCSI controller´s type but I´m not sure in this.
Termination
It makes a difference if a hard disk is built in or not. If a hard disk is built in then the Mac terminates the INTERNAL (!) connection on it´s own which results a slightly different EXTERNAL (!) termination. Now, this results two sceneries: as the Plus doesn´t have an internal hard disk he handles the termination different from a PowerBook as these mostly have a hard disk built in. So if we are looking on Your EN/SC mini along with a Mac Plus we will have to handle the Termination a bit different as it would look like with a PowerBook 1xx. Remember this: depending on the kind of device You are connecting there are many ways how to terminate that device. While some can be "jumpered" internally others need to hook up an active termination adapter block on the outside of their case.
I´m assuming that the termination of Your EN/SC mini is a) an "active" one and B) an "internal" one as You are just throwing a switch. As already noted Your EN/SC mini always utilizes the SCSI ID "6" (which might work with a PowerBook but not necessarily with the Mac Plus) so You don´t have much choice on terminating and "ID"ing Your hard disk which is supposed to be connected externally to Your Mac Plus. With this setup TRIPPLE-CHECK (!) the following:
terminate the EN/SC and connect it as the physically LAST device within the external SCSI chain. Between the EN/SC and the Mac Plus there goes Your hard disk. It has to have a LOWER ID than Your EN/SC (something like 1,2,3,4 or 5 but NOT (!) 0). Make sure that a) the according SCSI ID is jumpered directly on the controller board of Your hard disk and B) that this device is b.1) terminated and b.2) - depending on the hard disk manufacturer and type - is recieving termination power from BUS. While hard disks like Seagate, IBM and other offer this kind of termination most older Quantum drives don´t so with Quantums You are damned to hope this kind of termination is working.
Regarding Your PowerBook - which has an internally terminated SCSI ID 0 or 1 hard disk - You should NOT terminate an externally connected additional hard disk but only the EN/SC mini!
Now for hubs, switches and collisions in general...
Recieving collisions always means that there is something going wrong so again I´m asking: are You sure that You are using a 5 port HUB and not a switch? Are You sure that this HUB is a 10Mbit and NOT a 10/100Mbit? Re-Google that device in order to retrieve more information about this. Also make sure that You are NOT using a crossover Ethernet cable between Your HUB and the D-Link switch!
Now for software settings within "MacTCP"...
Depending on Your router´s network IP and subnet mask there are some differences in configuring this control panel. In all circumstances I tried to connect my EN/SC it always failed to retrieve any router information dynamically so I was forced to configure the EN/SC network connection as "manually" - while I was forced to do so others reported different experiences but I can´t help You in these. Now follow these steps:
Open "MacTCP" and click on "more options" at the bottom of the first window, a new window should appear. On top left set the configuration to "Manually". To the right of this in "IP Adress" choose the appropiate class: if Your router uses a "255.255.255.0" subnet mask the class shuold be "c" (change classes to see the other subnet mask options). To the down left of that window within "routing information" enter Your router´s IP adress (192.168.1.1 ?). Within "Domain Name Server Information" You can enter Your ISP´s information. While this worked for others it didn´t work for me so You will have to try on Your own. Now click on "OK". Back in the first window You can now manually change the IP adress to whatever IP adress You assigned to Your EN/SC in dependence on it´s MAC adress.
Now I don´t know anymore what to write. If these hints don´t help let me know, then I will set up my PowerBook completly new. Helps to reconstruct various steps I made lots of years ago.
J
Let´s begin with that SCSI troubles that might appear. You stated that the EN/SC has the ability to be terminated or not. The next this is the fact that a Macintosh Plus does not utilize an internal hard disk so in order to use a hard disk with a Mac OS You will have to connect two SCSI devices to Your Plus - although Asante doesn´t recommend this.
Well, there are some options but let us state some basics first. Old Macs like the Plus or 1xx Powerbooks are slightly different regarding their SCSI handling.
SCSI IDs
Internal (NOT external) hard disks in older Macs should (...!...) always have the SCSI ID "0". You aren´t forced to use "0" but it makes connection of external devices a bit easier ;-) Now, for the external devices it officially doesn´t matter in which order the other IDs do appear. Example:
Mac Plus .
BUT: me in personal has noticed that especially with early Macs it can solve lots (!) of problems if You take care of the ID´s order. Regarding the already mentioned example it would look like this:
Mac Plus .
Note that I wrote "can solve problems"! While others didn´t face such problems I could solve problems sometimes only this way. Second note on SCSI IDs with older Macs: try to only use IDs up to the maximum number of "3". Regarding the already mentioned example it would result in a change of SCSI IDs like this:
Mac Plus .
I noticed from my own experience that my Mac Plus behaved strange when IDs larger than "3" were used while later Macs like the SE/30 didn´t bother about it very much. I think it depends on the SCSI controller´s type but I´m not sure in this.
Termination
It makes a difference if a hard disk is built in or not. If a hard disk is built in then the Mac terminates the INTERNAL (!) connection on it´s own which results a slightly different EXTERNAL (!) termination. Now, this results two sceneries: as the Plus doesn´t have an internal hard disk he handles the termination different from a PowerBook as these mostly have a hard disk built in. So if we are looking on Your EN/SC mini along with a Mac Plus we will have to handle the Termination a bit different as it would look like with a PowerBook 1xx. Remember this: depending on the kind of device You are connecting there are many ways how to terminate that device. While some can be "jumpered" internally others need to hook up an active termination adapter block on the outside of their case.
I´m assuming that the termination of Your EN/SC mini is a) an "active" one and B) an "internal" one as You are just throwing a switch. As already noted Your EN/SC mini always utilizes the SCSI ID "6" (which might work with a PowerBook but not necessarily with the Mac Plus) so You don´t have much choice on terminating and "ID"ing Your hard disk which is supposed to be connected externally to Your Mac Plus. With this setup TRIPPLE-CHECK (!) the following:
terminate the EN/SC and connect it as the physically LAST device within the external SCSI chain. Between the EN/SC and the Mac Plus there goes Your hard disk. It has to have a LOWER ID than Your EN/SC (something like 1,2,3,4 or 5 but NOT (!) 0). Make sure that a) the according SCSI ID is jumpered directly on the controller board of Your hard disk and B) that this device is b.1) terminated and b.2) - depending on the hard disk manufacturer and type - is recieving termination power from BUS. While hard disks like Seagate, IBM and other offer this kind of termination most older Quantum drives don´t so with Quantums You are damned to hope this kind of termination is working.
Regarding Your PowerBook - which has an internally terminated SCSI ID 0 or 1 hard disk - You should NOT terminate an externally connected additional hard disk but only the EN/SC mini!
Now for hubs, switches and collisions in general...
Recieving collisions always means that there is something going wrong so again I´m asking: are You sure that You are using a 5 port HUB and not a switch? Are You sure that this HUB is a 10Mbit and NOT a 10/100Mbit? Re-Google that device in order to retrieve more information about this. Also make sure that You are NOT using a crossover Ethernet cable between Your HUB and the D-Link switch!
Now for software settings within "MacTCP"...
Depending on Your router´s network IP and subnet mask there are some differences in configuring this control panel. In all circumstances I tried to connect my EN/SC it always failed to retrieve any router information dynamically so I was forced to configure the EN/SC network connection as "manually" - while I was forced to do so others reported different experiences but I can´t help You in these. Now follow these steps:
Open "MacTCP" and click on "more options" at the bottom of the first window, a new window should appear. On top left set the configuration to "Manually". To the right of this in "IP Adress" choose the appropiate class: if Your router uses a "255.255.255.0" subnet mask the class shuold be "c" (change classes to see the other subnet mask options). To the down left of that window within "routing information" enter Your router´s IP adress (192.168.1.1 ?). Within "Domain Name Server Information" You can enter Your ISP´s information. While this worked for others it didn´t work for me so You will have to try on Your own. Now click on "OK". Back in the first window You can now manually change the IP adress to whatever IP adress You assigned to Your EN/SC in dependence on it´s MAC adress.
Now I don´t know anymore what to write. If these hints don´t help let me know, then I will set up my PowerBook completly new. Helps to reconstruct various steps I made lots of years ago.
J