home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!mcsun!sunic!dkuug!dde!ap
- From: ap@dde.dk (Allan Petersen)
- Newsgroups: comp.sys.handhelds
- Subject: $US 3.00 Serial cable kit for HP48/HP95
- Message-ID: <1992Nov23.143155.12395@dde.dk>
- Date: 23 Nov 92 14:31:55 GMT
- Organization: Dansk Data Elektronik A/S
- Lines: 127
-
-
- I posted this on c.s.hp48 some days ago. It may be of
- interest to others as well, so I now post it on
- c.s.handhelds and c.s.palmtops:
- -----------------------------------------------------------
-
-
- Now the FINAL "Cheap do-it-yourself serial cable kit:"
- --------------------------------------
-
- I've now found a commercial 4 pin connector with a 2 mm pin
- spacing suitable for the serial port on a HP48S, HP48SX or
- HP95LX.
-
- It's an AMP connector type 173977-4. However, it uses IDC
- (Insulation Displacement Connection) termination and will
- thus require a special hand tool to attach a cable.
-
- I was able to borrow this hand tool, so I bought a bag of
- connectors to make some cables. I will now offer these for
- sale to people on the net.
-
- Shipping all the cables individually to the States (were I
- assume the main number of buyers are anyway) doesn't sound
- very efficient to me, so now Joel Kolstad has agreed to
- distribute the cables "locally", and I've shipped a box of
- cables to him. The cables should then be available soon.
-
- The serial cable kit consists of a connector attached to a
- short (6 to 7 inches) length of (flat) cable. The other end
- of the cable is unterminated to enable you to attach a
- suitable DB25/DB9/other connector or extend the cable at
- your own choise. The cable comes with instructions on how
- to wire the DB25/DB9 connector.
-
- The price will be US$ 3.00 for each cable.
-
- Ordering instructions: Send your order, a Self Addressed
- Stamped Envelope, and $US 3.00
- (for each cable) to:
-
- Joel Kolstad
- Room 1310 ERB
- 1500 W. Johnson Dr.
- Madison, WI 53706
- USA
-
- Joel will then mail the cable(s) and the instructions to
- you (he promised :-)). He also promised to post a message
- on the net in case he runs out of cables.....
-
- Anyway, if you have any questions, you can reach Joel by
- email: kolstad@cae.wisc.edu
-
- Allan Petersen, ap@dde.dk
-
- ---------------------------------------------------------------
- This is the describtion that comes with the $3 Serial cable kit:
- ---------------------------------------------------------------
-
- CABLE KIT for HP48S, HP48SX and HP95LX:
-
- Using the cable is described in the manual for HP48SX in
- chapter 33, "Transferring Data to and from the HP48."
-
- The pin connections are described in several places, e.g. in
- The HP48 Handbook by James Donnelly, in several articles on
- c.s.hp48 and in the FAQ file sometimes posted on c.s.hp48.
-
-
- >From the recent FAQ:
-
- 30. What are the pinouts for the HP 48SX serial connector?
-
- Looking at the pins of the HP 48SX (the following diagram is
- showing the pins on the HP 48SX, as you look *AT* the
- calculator):
- _________
- | o o o o |
- \_______/
- ^ ^ ^ ^
- | | | \------ 4 Signal GND
- | | \-------- 3 RX (input to the HP 48SX)
- | \---------- 2 TX (output from the HP 48SX)
- \------------ 1 SHIELD
-
- Stated another way:
-
- HP48SX IBM 9 PIN IBM 25
- (From the outside
- edge -> inward)
- SHIELD--------Yellow-or-Grey-------SHIELD (1)-------- SHIELD (1)
- TX (Output)---Orange-or-Violet---->2 RX (Input)------>3 RX (Input)
- RX (Input)<---Red----or-Blue-------3 TX (Output)------2 TX (Output)
- SGND----------Brown--or-Green------5 GND--------------7 GND
- 4 DTR---! 5 CTS--!
- ^ 6 DSR---! 6 DSR--!
- Colour code 8 CTS---! 20 DTR--!
- on cable kit
-
- The cables comes with one of the indicated colour codings
- (brown,red, orange,yellow or green,blue,violet,grey).
-
- On the 9 pin connector you may have to wire pin 4, 6, and 8
- together and on the 25 pin connector you may have to wire
- together pin 5, 6, and 20. This is required with some
- computers (to have CTS and DSR active), but it may not always
- be required.
-
- The other day I had the chance to try a new cable on a brand
- new 48SX. It worked fine, but I had to press the connector in
- place with the tip of a screwdriver until a slight click
- announced that it was correctly seated. I never experienced
- that with my own old 48SX. I better mention it here, or
- somebody might think the cable isn't working reliably :-). It
- really *is* important to press the cable firmly in place,
- until the cable has been used some times. I have now used a
- cable like this for more than half a year, and it has always
- worked fine.
-
- Enjoy your new cable and all the useful software to which you
- can now have access. Long live comp.sys.hp48 and
- comp.sources.hp48...
- ...and hp-mail-server@seq.uncwil.edu :-)
-
- Allan Petersen
- ap@dde.dk
-