16 Oct
2006
16 Oct
'06
3:07 p.m.
To test weither you need a null-modem or not, when
you
have a 25 pin conector, get one of those RS-232 line
monitors (available at RadioShack for < $10.00) which
display several of the signals using leds. If both pin 2 and
3 light up, you are probably Ok, If only one lights up,
you probably need a null modem. If you then put in a
null modem, and still only have one light, you have a
bad (cable, interface, etc).
I was at a Radio Shack a couple months ago and observed these line
monitors being removed from inventory. They said they'd be liquidated by
someone else. Jameco may be a more reliable source for this gizmo now.