Rogier Wolff wrote:
> Bostjan Lemut wrote:
> [Charset iso-8859-2 unsupported, filtering to ASCII...]
> > Hi!
> >
> > I've bought a second-hand UMAX Astra 600S scanner, but it came without
> > terminator (the scanner won't work without it). Since I can't buy it in
> > any computer shop in our country (it's very small one), I decided to
> > make one by myself. The problem is, i can't find a scheme on the WEB.
> >
> > I would be very greatful if anyone send me the scheme how to build the
> > damn terminator.
>
> +5V
> |
> |
> |-|
> | | 220 Ohm
> |_|
> |
> Signal ---------+
> |
> |-|
> | | 330 Ohm.
> |_|
> |
> |
> GND
>
I've done some more detailed measurments, and I came up with next (see
attachments).
Can anybody confirm all this?
Bostjan
--------------6B440577207F199BA592D497
Content-Disposition: inline; filename="pini2.txt"
Content-Type: text/plain; charset="iso-8859-2"; name="pini2.txt"
____________________________________________ ____________________________________________
| SCSI | | MINI | | | | SCSI | | MINI | | |
| SIGNAL| DD-50P | MICRO | DD-50SA | DB25 | | SIGNAL| DD-50P | MICRO | DD-50SA | DB25 |
-------------------------------------------- --------------------------------------------
| -GND | 2 | 26 | 34 | 8 | | (open)| 1 | 1 | 1 | 14 |
| -DB(0)| 4 | 27 | 2 | 21 | | +DB(0)| 3 | 2 | 18 | 14 |
| -DB(1)| 6 | 28 | 19 | 22 | | +DB(1)| 5 | 3 | 35 | 14 |
| -DB(2)| 8 | 29 | 36 | 10 | | +DB(2)| 7 | 4 | 3 | 16 |
| -DB(3)| 10 | 30 | 4 | 23 | | +DB(3)| 9 | 5 | 20 | 16 |
| -DB(4)| 12 | 31 | 21 | 11 | | +DB(4)| 11 | 6 | 37 | 16 |
| -DB(5)| 14 | 32 | 38 | 12 | | +DB(5)| 13 | 7 | 5 | 18 |
| -DB(6)| 16 | 33 | 6 | 13 | | +DB(6)| 15 | 8 | 22 | 18 |
| -DB(7)| 18 | 34 | 23 | 20 | | +DB(7)| 17 | 9 | 39 | 18 |
| -DB(P)| 20 | 35 | 40 | -- | | +DB(P)| 19 | 10 | 7 | -- |
| GND | 22 | 36 | 8 | -- | |DIFSENS| 21 | 11 | 24 | 18 |
| GND | 24 | 37 | 25 | -- | | GND | 23 | 12 | 41 | -- |
|TERMPWR| 26 | 38 | 42 | 25 | |TERMPWR| 25 | 13 | 9 | -- |
| GND | 28 | 39 | 10 | -- | | GND | 27 | 14 | 26 | -- |
| -ATN | 30 | 40 | 27 | -- | | +ATN | 29 | 15 | 43 | -- |
| GND | 32 | 41 | 44 | 17 | | GND | 31 | 16 | 11 | 7 |
| -BSY | 34 | 42 | 12 | -- | | +BSY | 33 | 17 | 28 | -- |
| -ACK | 36 | 43 | 29 | 6 | | +ACK | 35 | 18 | 45 | 7 |
| -RST | 38 | 44 | 46 | 5 | | +RST | 37 | 19 | 13 | 7 |
| -MSG | 40 | 45 | 14 | 4 | | +MSG | 39 | 20 | 30 | 9 |
| -SEL | 42 | 46 | 31 | 2 | | +SEL | 41 | 21 | 47 | 9 |
| -C/D | 44 | 47 | 48 | 19 | | +C/D | 43 | 22 | 15 | 9 |
| -REQ | 46 | 48 | 16 | 15 | | +REQ | 45 | 23 | 32 | 24 |
| -I/O | 48 | 49 | 33 | 1 | | +I/O | 47 | 24 | 49 | 24 |
| GND | 50 | 50 | 50 | 3 | | GND | 49 | 25 | 17 | 24 |
-------------------------------------------- --------------------------------------------
--------------6B440577207F199BA592D497
Content-Disposition: inline; filename="pini3.txt"
Content-Type: text/plain; charset="iso-8859-2"; name="pini3.txt"
1 2 3 4 5 6 7 8 9 10 11 12 13 <- pins
136 136 136 136 136 136 30 136 30 136 136 136 136 <- ohms
_______________________________________________________________
30 136 30 136 30 136 136 136 136 136 30 | <- ohms
14 15 16 17 18 19 20 21 22 23 24 25 <- pins
middle line is just a common junction to a pin with | instead of resistance
1 2 3 4 5 6 7 8 9 10 11 12 13 <-pins
142 142 142 142 142 142 | 142 | 142 142 142 142 <-ohms
_______________________________________________________________
| 142 | 142 | 142 142 142 142 142 | 30 <-ohms
14 15 16 17 18 19 20 21 22 23 24 25 <-pins
1 2 3 4 5 6 7 8 9 10 11 12 13 <-pins
262 262 262 262 262 262 142 262 142 262 262 262 262 <-ohms
_______________________________________________________________
142 262 142 262 142 262 262 262 262 | 142 136 <-ohms
14 15 16 17 18 19 20 21 22 23 24 25 <-pins
--------------6B440577207F199BA592D497--
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