DIP Switch Settings for HP 7475 Plotter (RS-232)
================================================
S S U A B B B B
2 1 Y S 3 4 3 2 1
+-------------------------------------+
| +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ | 1
| | | | | | | | | | | |X| | | |X| | | |
| +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ |
| |X| |X| |X| |X| |X| | | |X| | | |X| |
| +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ | 0
+-------------------------------------+
-+---+- D M A -+---+---+---+-
|PAR| | E 4 | BAUD |
| | | T | | | | |
| | | | | | | | |
none(*)0 0 | | | 0 0 0 0 external, 2 stop bits
even 0 1 | | | 0 0 0 1 75 bps, 2 stop bits
none 1 0 | | | 0 0 1 0 110 bps, 2 stop bits
odd 1 1 | | | 0 0 1 1 150 bps, 1 stop bit
| | | 0 1 0 0 200 bps, 1 stop bit
"D" is for ----+ | | 0 1 0 1 300 bps, 1 stop bit
Direct (vs. "Y" | | 0 1 1 0 600 bps, 1 stop bit
for Y-connector). | | 0 1 1 1 1200 bps, 1 stop bit
You'll want "D". | | 1 0 0 0 2400 bps, 1 stop bit
| | 1 0 0 1 4800 bps, 1 stop bit
| | 1 0 1 0 9600 bps, 1 stop bit(*)
Paper Size: | | 1 0 1 1 300 bps, 2 stop bits
(*)ISO A4 --- 0 0 1 1 0 0 600 bps, 2 stop bits
ISO A3 --- 0 1 1 1 0 1 1200 bps, 2 stop bits
ANSI A --- 1 0 1 1 1 0 2400 bps, 2 stop bits
ANSI B --- 1 1 1 1 1 1 4800 bps, 2 stop bits
Cabling
=======
The 7475 uses a non-standard cable (HP P/N 17255A).
Mine rings out like this:
Computer Plotter
Female Male
25-pin "D" 25-pin "D"
================================
1 ---------------------- 1
2 ---------------------- 3
3 ---------------------- 2
5 --+------------------- 20
|
6 --+
7 ---------------------- 7
------------------------------