anyone need POGO cable for HP 20b/30b, HP 15C LE?

[hojeongko]

I found a way to get a POGO cable that works for the HP 20b/30b, HP 12c+ (2008-2005), HP-12c 30th, and HP 15c LE.

Here
6pin pogo connector
erase and reset button
Anyone can perform flashing using .

Necessary items
1. POGO cable(the calculator store), POST 2015 HP 12c, HP 15c CE
2. USB A extend cord.
3. PL2303HX USB to TTL RS232.
4. Soldering tools.

When you remove the case of the PL2303HX, you will find the board inside.
Use a soldering iron to separate the cable.

Cut the USB A extend cord.
Only use the USB A (female) part.
Peel off the wire and reattach it to the board prepared above.
When connecting lines, you must be aware of TX and RX.

When first disconnecting a wire from the board, check the color of the connecting wire carefully.
Afterwards, solder the prepared USB A cable again, but this time, solder it in a different color from the existing one. That is, connect the Tx of the board and the Rx of USB, and connect the Rx of the board to the Tx of USB A. Vcc is not used. GND connects to GND in the same way.

If you've done this, your work is done.
If you connect the newly made product with the pogo cable shown in item 1, it becomes a flashing cable for voyager using ARM versions prior to 2015.

When the gender is separated, it becomes a flashing cable for arm-using voyagers from 2015 or later to suit existing uses.

[ijabbott]

Make sure the USB-to-TTL serial converter is set for 3.3V TTL and not 5V TTL. Sometimes there is a slide switch or a jumper to change the signal voltage between 3.3V and 5V.

• Pin 1 of the USB socket (VCC +5V, usually a red wire) not connected.
• Pin 2 of the USB socket (D- signal, usually a green wire) goes to TXD on the USB-to-TTL-3.3V serial converter.
• Pin 3 of the USB socket (D+ signal, usually a white wire) goes to RXD on the USB-to-TTL-3.3V serial converter.
• Pin 4 of the USB socket (GND signal, usually a black wire) goes to GND on the USB-to-TTL-3.3V serial converter,
  

Some people recommend the use of a 1KΩ resistor on the TXD signal, at least for the HP 20b/30b because they are expecting 3V signal levels, not 3,3V, and the resistor mitigates for the slight over-voltage.

You don't have to use PL2303 modules. FT232R or CH341A modules should do as well, as long as they are TTL 3.3V (sometimes written TTL 3V3).

[hojeongko]

ijabbott
Your point is correct.
Anything is possible as long as USB to TTL3V3.
However, the mention of the PL2303 module is because I made a cable with it and did flashing.

The key to this article is to get a 6pin POGO connect.
And the key is not to make any modifications to the flashing cable you purchased.
In other words, if you create a conversion module, you can flash both before 2015 and post 2015.

(06-15-2024 07:11 PM)ijabbott Wrote:  Make sure the USB-to-TTL serial converter is set for 3.3V TTL and not 5V TTL. Sometimes there is a slide switch or a jumper to change the signal voltage between 3.3V and 5V.

• Pin 1 of the USB socket (VCC +5V, usually a red wire) not connected.
• Pin 2 of the USB socket (D- signal, usually a green wire) goes to TXD on the USB-to-TTL-3.3V serial converter.
• Pin 3 of the USB socket (D+ signal, usually a white wire) goes to RXD on the USB-to-TTL-3.3V serial converter.
• Pin 4 of the USB socket (GND signal, usually a black wire) goes to GND on the USB-to-TTL-3.3V serial converter,
  

Some people recommend the use of a 1KΩ resistor on the TXD signal, at least for the HP 20b/30b because they are expecting 3V signal levels, not 3,3V, and the resistor mitigates for the slight over-voltage.

You don't have to use PL2303 modules. FT232R or CH341A modules should do as well, as long as they are TTL 3.3V (sometimes written TTL 3V3).