Free Downloads » Connectivity Kit for Windows » HP50g Calculator Connectivity Kit (CONNX4) also for HP48, HP49 » Serial Cable for Old HP-48G Series

Serial Cable for Old HP-48G Series

Looking at back of HP-48:hp48g pin out

Connect your HP-48GX, HP-48G+, HP-48G, HP-48SX, or HP-48S to your computer with this high quality 9 pin (PC) to 4 pin (Calc) serial cable. This cable is not suitable for any other calculators except those listed above.

    ---------
| 1 2 3 4 |
\_______/

Here are the pinouts for the HP-48G serial port:

                  4 3 2 1
/------------|-|-|-|----\
| 48SX | Pin Function Std RS232 pin
| ___________________ |
| | | | 1 Chassis Ground 1
| | 4: "THIS" | | 2 Transmit Data 2
| | 3: "IS" | | 3 Receive Data 3
| | 2: "THE" | | 4 Signal Ground 7 (DB25)
| | 1: "SCREEN" | | or 5 (DB9)
| ------------------- | DB25 = 25 pin connector
| | DB9 = 9 pin connector
| [A] [B] [C] [D] [E] [F] |
| MTH PRG CST VAR ^ NXT |
| . . . . . . |

HP-48 pin RS232 pin

   CHG   1  - - - - - - - -  1  CHG     Chassis ground does not
actually have to be connected.
TX 2 --------------- 2 TX

RX 3 --------------- 3 RX
GND 4 --------------- 7 GND (DB25) or 5 (DB9)

hp48g cable

Updated On: 13.09.15

  1. On 23-Apr-2019, Izzy4u wrote: 
    I have a usb cable with five headers, which ones do I connect to my calculator?
    Your reply to Izzy4u

  2. On 10-Dec-2016, Gian Uberto wrote: 
    Is the USB version of the HP48 cable seen as a serial cable by the PC?
    Your reply to Gian Uberto

  3. On 30-Jun-2015, Sean Scully wrote: 
    I found a brand new 048-CAT TDS cable for a HP48 to a 9 pin. Will not last long.
    Your reply to Sean Scully

  4. On 25-Aug-2014, Tony Romo wrote: 
    need data transfer cable for hp 48gx to Nikon dtm 522 total station.
    Your reply to Tony Romo

  5. On 17-Jun-2014, Dan Petr wrote: 
    where can find .048-CNTG cable replacement
    Your reply to Dan Petr

  6. On 04-Feb-2013, Peterforslund wrote: 
    Do any body how to do the conection betwin hp48sx and usb..
    Your reply to Peterforslund

  7. On 31-Jul-2012, Steve wrote: 
    The USB version of this cable is already available, you may refer to the following links for more information:
    HP48 to USB Cable (Teknovo Uno):
    www.ebay.com/itm/180661859591 or www.oxytronics.ecrater.com/p/12103776
    Regards,
    -Steve
    Your reply to Steve

  8. On 17-Jul-2012, Mauricio wrote: 
    Is there any HP48g cable with USB?
    Your reply to Mauricio
    • On 31-Jul-2012, Steve replied: 
      Yes, the HP48 Series USB cable is already available (direct HP48 to USB) You can find more information here:
      HP48G to USB (Teknovo Uno):
      www.oxytronics.ecrater.com/p/12103776
      http://www.ebay.com/itm/180661859591
      Regards,
      -Steve
      Your reply to Steve

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In reply to Peterforslund, who on 04-Feb-2013 wrote:
Do any body how to do the conection betwin hp48sx and usb..