HP 7220C plotter port settings
jules.richardson99 at gmail.com
Thu Dec 5 17:34:03 CST 2019
I picked up an HP 7220C flatbed plotter the other day which (after freeing
the stuck carriage) is responding to panel commands in 'local' mode. For
the terminal RS-232 interface, does anyone happen to know:
a) The character size (7 or 8 bits)?
b) If the connection between terminal and plotter is supposed to be
straight through (i.e. 1:1 pin mapping), null modem, or something else
I'm not sure if the plotter considers itself DTE or DCE, given that it has
a modem output port (i.e. it sits partway along in the chain of things).
Oh, there's a "conf test" switch setting on the back - does anyone know the
purpose of that? I'm wondering if it's supposed to echo back to the
terminal any data that's sent to the plotter, but that's purely a guess.
Sadly there don't seem to be any docs online (or much in the way of any
info, to be honest).
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