Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-pcd!hpcvra!prestonb
From: prestonb@hpcvra.CV.HP.COM (Preston Brown)
Newsgroups: comp.sys.handhelds
Subject: HP 48SX serial I/O pinout
Message-ID: <21580018@hpcvra.CV.HP.COM>
Date: 12 Mar 90 22:50:36 GMT
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 13


The following table shows how the 48SX 4 pin, the cable's 9 pin 
connector and the 25 pin adapter provided with the MSDOS PC link 
package are wired.

HP48SX                  IBM 9 PIN               IBM 25 PIN
(From the outside->in)
SHIELD-------------------  SHIELD----------------  SHIELD
TX (Output)<-------------2 RX (Input)------------3 RX (Input)
RX (Input)-------------->3 TX (Output)---------->2 TX (Output)
SGND---------------------5 GND-------------------7 GND

Preston