derry.birse@ind.alstom.com writes:
>      Sun 3/60       DeskJet
>      TxD       2-->3     RxD
>      RxD       3<--2     TxD
>      SG        7---7     SG
>      CTS       5<--20    DTR

My old HP Laserjet printer needed hw flow control for correct
operation with large files.  For some reason the printer folks decided
that DTR was the flow-control line.  I see you've spotted that.

I'm a firm believer in wiring up all of the big-7
(tx,rx,dtr,dsr,rts,cts,cd).

Have you tried putting a 7-led red/green indicator on it and seeing i
any of the other lines indicate activity?  

-wolfgang
-- 
       Wolfgang Rupprecht <wolfgang+gnus@dailyplanet.wsrcc.com>
		    http://www.wsrcc.com/wolfgang/
DGPS signals via the Internet  http://www.wsrcc.com/wolfgang/gps/dgps-ip.html