The informal consensus on the serial pinouts for the
HP4M+ laser printer appears to be:
HP4M+ HP C2809A SUN 25 pin
9 pin port 9-25 M-F tty or alm2
========== ========== ===========
pin sig pin sig pin sig
--- --- --- ----- --- -----
1 RTS 1 ChGnd 1
2 Tx 2 Tx 2 Tx
3 Rx 3 Rx 3 Rx
4 DSR 4 4 RTS
5 GND 5 5 CTS
6 DTR 6 DSR 6 DSR
7 nc 7 GND 7 GND
8 DTR 8 8 DCD
9 nc 20 DTR 20 DTR
Here are the connectors I use:
Sun HP Printer
------ ----------
Tx 2 ----------- (red) -------------- 3 Rx
Rx 3 ----------- (yel) -------------- 2 Tx
CTS 5 ----------- (grn) -------------- 20 DTR
Gnd 7 ----------- (blk) --------------- 7 Gnd
Official HP info can be found at:
--------------------------------------------------
1-800-752-0900 for the customer info. centre.
1-800-333-1917 HP FIRST Fax System document #1595
hp www server (http://www.hp.com)
jakem@apex.com says thanks to:
------------------------------
ozunal@bilkent.edu.tr
barrowma@mrspock.nwafc.nf.ca
rob.e.allan@hydro.on.ca
matthew.hofener@camp.org
mamcom@vth.cvm.umn.edu
markus@octavia.anu.edu.au
chris@tisc.edu.au
yann@uni-paderborn.de
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