On Aug 31, 2004, at 10:29 AM, Pete Turnbull wrote:
> On Aug 31 2004, 0:44, Ron Hudson wrote:
>
>> I am currently using an Imagewriter printer cable to hook up one
>> device, and that
>> seems to work ok, and there is no electronics there.. Perhaps the
>> transformers are
>> for some safety - decoupling purpose?
>
> You have the equivalent of a point-to-point link, with Tx on one device
> connected to Rx on the other. When you have things set up as a
> network, all the Txs go onto a bus that connects all the Rxs. The
> transformers allow the signals to combine, and separate them for each
> station.
>
> But I'd expect you could just find some proper boxes easily and cheaply
> enough; they're not rare, even here in the UK.
Here's the schematic from the site You mentioned...
==============
A "O" means a connection
PIN NUMBERS ARE FOR MAC DB-9.
NUMBERS IN () ARE FOR MINI DIN 8 (MAC PLUS)
CapNet Connector (last update 8/21/90)
J1 J2
9 (5) C1 .1 uF
RCV(-) ----------------------------O----------][------O <myx>
!
8 (8) ! C2 .1 uF
RCV(+) --------------------------------O------][------O <myy>
! ! ^
! ! TO
5 (3) 10 ohm ! ! "PHONE"
TX(-) -----------O-----------R3---- ! LINES
! !
4 (6) ! 10 ohm !
TX(+) -----------------O-----R4--------
! !
1K R R 1K
1 2
! !
3 (4) ! !
GND -----------O------
PARTS LIST:
QTY DES ITEM
2 R1,2 1K 1/8W RESISTORS
2 R3,4 10 OHM 1/8W RESISTORS
2 C1,2 .1 uF THREE LAYER CERAMIC CAPS
1 J1 DB-9 MALE OR MINI DIN 8 CONNECTOR
1 J2 2 PIN BERG OR RJ-11 PHONE CONNECTOR
5 WIRE (NOT SHOWN) 22 GAUGE STRANDED WIRE 6"
==============================
I assume I connect all the <MYX> together and all the <MYY> together to
actually join the
machines..
Since all 3 items are sitting in one place, I will probably build a
small PCB with 3 parts
of 2 printer cables cut in half.
>
> --
> Pete Peter Turnbull
> Network Manager
> University of York
>
Received on Tue Aug 31 2004 - 13:53:26 BST
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