| |
G4NZK > ARCHIM 21.03.95 17:33l 29 Lines 1021 Bytes #999 (0) @ EU
BID : 020005076PZT
Read: GUEST
Subj: TNC cf Modem leads
Path: DB0AAB<DB0KCP<DB0CZ<DB0GE<LX0PAC<ON5VL<ON1KGX<ON1KEZ<F6KIF<F6PTT<
F6ABJ<F6KDS<F5KJT<F5SEM<F6RAE<F5KAR<GB7SXE<GB7VRB<GB7IOW<GB7VES<GB7DEO<
GB7BST<GB7SRC<GB7AVM<GB7BEN<GB7BED<GB7ZPU<LWBBBS<GB7LWB<GB7COV<GB7OGY<
GB7AYI<GB7BAD<GB7FLG<GB7SYP<GB7GCW<GB7WRG<GB7CYM<GB7EYM<GB7KLY<GB7PWY<
GB7PVO<GB7CHS<GB7MAX<GB7PZT
Sent: 950318/1753Z @:GB7PZT.#24.GBR.EU [Kidderminster] #:502
I knew that the serial lead for pre-A5000 machines had to be wired in
a unique way to overcome a fault in the harware. What I didn't realise
was that this wiring was NOT the same for most TNCs and Modems. Using
the TNC lead on a modem or visa-versa gave all sorts of problems.
The difference is that on the TNC there is no connection between arc
pins 1,4,8 and pin 20 of the TNC.
On a modem this connection is ESSENTIAL for a modem to recognise
DTR for !Slipdial and !TCP/IP.
The problem was that I didn't want to use different cables to my
serial switch box just in case I accidentally forgot which was which
and no, I can't afford a dual port card!. On my TNC220 pins 20 and 4
are shorted and this disables hardware handshaking.
My solution was to cut the link between pin 20 and 4 inside the TNC.
The link is very easy to see, located near the RS232 connector.
73, Brett G4NZK @ GB7PZT.#24.GBR.EU
Internet: brett@g4nzk.demon.co.uk
--- Sent by !ComLink on Sat,18 Mar 1995 at 18:03:53 ---
G4NZK @ GB7PZT
Read previous mail | Read next mail
| |
